Both the short term and long term fuel trims are high. The Air Flow Sensor or Mass Airflow Sensor (MAF) is one of the components of an electronic fuel injection system and is found in many of modern vehicles. I too have a K&N filter and after an offroad trip, I started randomly tripping the too lean code so I figured it was just the filter got too dusty (even though I'd think it'd be a low air flow code if that was the case), but I cleaned it anyway even though it had only been about 3 months since the last time. com 2001 bmw 325i i am getting codes p1083 p1085 p0171 p0174 what i have done so far i have replaced the ccv and put a new fuel filter on. Ignition coil burnt up again ( replaced this time no charge). If scan tool displays DTC P0171 FAILED THIS IGN, go to next step. This is a great video on using fuel trim. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. The fuel pump regulator could be allowing the wrong amount of pressure to be pumped to the fuel injectors. 0 Gasoline 2 codes P0171-Fuel trim Bank one condition and P0174- Fuel trim Bank two condition. 2002 Ford Ranger code p1537. 5 ecoboost it has about 55000 miles (125000km) on it never been abused was a executive car bought it with 47000 miles on it. This could be caused by a number of reasons, such as low fuel pressure, plugged fuel filter, worn fuel pump, vacuum leaks, exhaust leaks, etc. It happens randomly and its almost impossible to re create while testing. And as stated in a previous post, the fact the problem is affecting both banks narrows the field a bit. Justanswer. i went to autozone and baught the fuel filter for 10 dollars and it fixed the problem. Fired-up Torque and the codes P0171 and P0174 came forth from the engine management system. PCM's Adaptive Fuel Strategy has reached its Rich calibrated limit for bank 1. Changed fuel filter and cleaned MAF with a can of spray from an auto parts store for $12. So this morning I got a check engine light showing P0171 and P0174, lean both banks. Last week I decided to try and check the Egr valve for carbon build up, and Couldn't get the EGR to exhaust manifold tube loose. A code P0174 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty. It also throws the code P0174 to let you know that it has done this. i can clear them and they will. If the fuel mixture is (Caused by a bad fuel pump, filter or fuel. Running lean in both banks, I initially thought MAF, so I changed it NO LUCK. Technical Description: The engine is running lean on bank 2, meaning the air to fuel ratio is biased towards air. I thought a separate ODBII code would show, but some say the P0171 and P0174 would only show for the fuel filter. I also had codes p0171 and p0174 so I looked at the intake gaskets and replaced them, also a few vacuum line elbows that I found cracked that went from the fuel pressure regulator to the air intake. From my understanding, there is no externally mounted fuel pump or fuel filter on the Gen2 Tundra but rather the fuel filter and fuel pump are both located inside the fuel tank and the filter is a sock style filter and not a metal tube style filter. Then I read that a possible clogged inline fuel filter may be culprit. Low fuel pressure causing a P0171 and P0174 trouble code - Using fuel trim and freeze frame data to determine type of lean condition Section 4 pages 12-19 in my book available at www. The computer hears (accurately) from the Oxygen Sensor that the Fuel Mixture is too lean so the computer keeps increasing the amount of fuel being delivered into the combustion chambers. P0174 and P0300 r codes. Hello Gents, I'm REALLY bummed that the troubleshooting of this issue was abandoned. Mar 26, 2015. Causes Causes of the OBD-II code P0174 A code P0174 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty. The P0171 and P0174 problem was fixed. Gets a P0171 and sometimes also P0174 trouble code, at seemingly random and infrequent times. 0) that throws p0171 & p0174 codes. My 02 325i E46 P0174 code comes on during certain fuel levels. This is the kind of problem where having the scan tool specific for the car would be a big help. In fact, a scan tool reading of the long term fuel trim can lead to a quick fix of a P0174 or P0171 code. 0l and if anyone else was experiencing this problem please share thanks. It also throws the code P0174 to let you know that it has done this. However fuel filter should idle ok but run weak under heavy throttle. P0171: System Too Lean Bank 1. Hello there and welcome to the BMW Car Club of America. 4 eb edition. I'm still losing all fuel pressure after the truck is off or the pump stops. Find many great new & used options and get the best deals for BMW 3 E46 Coupe 1. I have a 96 Bronco and it has several problems that are driving me nuts. The car currently has 110,000 miles and never done the spark plugs or fuel filter change. Also, I have checked all vacuum hoses for leaks and found none. A plugged Fuel Filter or poorly functioning Fuel Pump can set the P0171 code. Note: This DTC is very similar to P0171 Jeep, and in fact your vehicle may show both codes at the same. i googled the codes and i dont think i have a vac leak and it says a good chance its the fuel filter but says nothing. On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. OE fuel filter 4. Ive got a 97 5. Typically. The following is an overview of P0171 check engine light code possible causes. However, my manual does not give a hint as to where it is located. Reset light just for the heck of it and drove out of town shopping and CEL did not come back on until later that night (After approx 60 miles or so). P0171 And P0174 Essentials. I wanted to say thanks guys. I have had it to a mechanic twice (a very reputable mechanic at that). The answer is only in some applications under some conditions. If a fuel filter is clogged or restricted this can alter the amount of fuel that reaches the injectors also. I hope people can give me some insights. I also had codes p0171 and p0174 so I looked at the intake gaskets and replaced them, also a few vacuum line elbows that I found cracked that went from the fuel pressure regulator to the air intake. I tried lucas injector cleaner, put about 3 small bottles, did not work but everytime I add a bottle of STP gas treatment with each full tank, the check your engine light. Ram P0174 Code Symptoms. Welcome to ShopLifeTV! In this video I go over the most common causes for the p0171 and p0174 codes. The cause is often a problem in the idle air control system. A plugged Fuel Filter or poorly functioning Fuel Pump can set the P0171 code. I'm still losing all fuel pressure after the truck is off or the pump stops. 6 v8 has been running rough lately. Ford F150 Trouble Code P0171 This video is a demonstration on how to identify and fix a common part failure in the 2003 Ford. When a vehicle has the fault code P0171 and or P0174, it means that computer can no longer automatically adjust the mixture between air and fuel. After 6 years or 60,000, that sensor is reported to have a high failure rate. Page 2 of 3: Troubleshooting P0171 and P0174 (Ford 4. Possible Causes and Repair Information for P0171 Toyota code. 50 miles later cel back on with same codes. 6 P0174 Code Symptoms. The computer hears (accurately) from the Oxygen Sensor that the Fuel Mixture is too lean so the computer keeps increasing the amount of fuel being delivered into the combustion chambers. Other things to look at after ruling out the above would be dirty fuel filter and fuel pump- easiest way to check would be to measure fuel pressure. I have been tormented by this car, a 2005 Chevrolet Malibu Maxx with 200,000 miles and it's P0171 and P0174 problems for over 6 months. Swapped in the same MAF from another Toyota. The P0174 code on a Mazda 6 will often be thrown if the fuel injection system is not operating properly. Where is the pressure port to measure Fuel Pump Pressure and what is the acceptable reading? I've just received the Mini-VCI interface cable to a PC but have not used it. 0L SOHC Rough Idle P0171 P0174 Lean Codes My last explorer which was. this won't hurt anything, you'll just be down on top end power. 3L VIN Z - Rpo L59 Engine Models: 2006 Avalanche 1500. But in this case, the Fuel System can't increase the amount of fuel. If the total corrective value is above a calibrated threshold for than 30 seconds, a fault is set. Last week my Check Engine light went on. February 13, 2019. Put a small hose, like fish tank hose on the nipple and suck on it. I've found good reason to change the following parts which have not solved my problem: 1. However, my manual does not give a hint as to where it is located. Additional Causes of Code P0171/P0174. The freeze frame info from the OBD scanner is as follows:. P0171 is System Bank 1 Lean, P0174 is System Bank 2 lean. DIRTY MAF SENSOR. If your difficulty is not really enough fuel, the underling bring about may perhaps be a weak fuel pump, limited fuel filter, leaky fuel stress regulator or dirty fuel injectors. The BMW E46 digital engine management (DME) systems use a hot-film mass airflow sensor, installed between the air filter housing and the intake manifold, to monitor air flow into the engine intake. Typically. P0171 and P0174 12-12-2013 03:44 PM #6. The P0174 code on a Mazda 6 will often be thrown if the fuel injection system is not operating properly. I have a 2005 Jaguar X-type. 0) that throws p0171 & p0174 codes. 170000 moving to Florida. In plain English, this means that the PCM is adding fuel like crazy to even out the Air/Fuel Mixture because it has detected a vacuum leak in bank 1. Well today I went ahead and replaced the fuel pressure regulator. SES light remained, although between this and the MAF I think I picked up 1-2 MPG. This could be caused by a number of reasons, such as low fuel pressure, plugged fuel filter, worn fuel pump, vacuum leaks, exhaust leaks, etc. 2001 Ford F150 Trouble Code P0171 Ford Explorer 4. The vehicle’s ECM will add more fuel to the mixture in order to bring the air fuel mixture where it needs to be for optimal combustion. Cause of P0171, P0174 and check engine light. Good luck!. The MAF sensor is located in the air inlet tube. On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. There were no hose clamps. I am going to do spark plugs and a fuel filter but I am just grasping at straws for a solution. Hello there and welcome to the BMW Car Club of America. Intermittent SES light - P0171 P0174 - no vac leaks Fuel pump/filter? So I've had this intermittent SES light for a while now and it's always the same codes (P0171 and P0174). Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. The answer is only in some applications under some conditions. February 13, 2019. Is that low enough to cause a lean code? Replacing fuel filter to see if that is a problem. Plugged a missing vacuum port plug in back of the intake manifold no visible leaks with VCG. This could be caused by a number of reasons, such as low fuel pressure, plugged fuel filter, worn fuel pump, vacuum leaks, exhaust leaks, etc. I pulled the codes and they are P0171 & P0174. PCM's Adaptive Fuel Strategy has reached its Rich calibrated limit for bank 1. 6 v8 has been running rough lately. The external fuel filter was/is located on the inside of the drivers side frame rail about where the drivers side door is. Changed fuel filter and cleaned MAF with a can of spray from an auto parts store for $12. 0 Gasoline 2 codes P0171-Fuel trim Bank one condition and P0174- Fuel trim Bank two condition. Code P0171 applies to Bank 1 and P0174 applies to Bank 2. First I started getting a P0171 and the code would clear it self and I would get it around twice a month. 9 F150 4x4 5spd - Hey all, I have a new Spectra rear fuel tank with a new Delphi fuel pump. In technical terms, codes P0171 and P0174 are defined as "System too Lean (Bank 1), and "System too Lean (Bank 2) respectively, but in both cases, the word "lean" refers to a condition where the air/fuel mixture deviates from the ideal 14. But in this case, the Fuel System can't increase the amount of fuel. P0171 BMW Tech Notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. bmw bimmer disa valve p0174 530i 525i 540i 528i m54 m54b30 m54b25 bank 2 too lean o2 sensor maf air filter grime vacuum leak brittle hose spark plug throttle body idle control valve elbow intake boot upper lower p0171 safety and emissions owner bank 1 catalytic converter torque horsepower registration safety and emissions state annual m5 upper lower intake boot crack brittle old hardened. When I come out of a turn my throttle. On my 02 S55 160k miles I've been trying to solve these codes. OBD2 Code P0171 BMW definition: Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). It can be caused by a faulty MAF, faulty oxygen sensor, low fuel pressure and vacuum leaks. Here is a discussion of their meaning and their common causes. Question = About 6 months ago i had problem start the truck, like it ran out of gas,but i was half full. It came back on after couple days later. Part after part, nothing. Q: I have codes p0171 p0174 and p1083. My only trouble was removing the fuel lines, for my X5 (2003) they had a couple of slip on connectors with green clamps to keep the connectors from slipping off. I'm thinking that either an injector is bleeding down or the pump itself is. scannerdanner. Ford MAF sensor. The P0174/P0171 codes (Fuel system too lean, banks 1 and 2) usually means a vacuum leak from the intake manifold gasket, a vacuum hose, PCV hose, etc, or the MAF is dirty, or there's a fuel delivery problem (clogged injectors, fuel pump going out, etc). p0171 & p0174 would valve covers cause this? I've cleaned the injectoers replace the fuel pump and filter. OE fuel filter 4. The computer hears (accurately) from the Oxygen Sensor that the Fuel Mixture is too lean so the computer keeps increasing the amount of fuel being delivered into the combustion chambers. Note: This DTC is very similar to P0171 Jeep, and in fact your vehicle may show both codes at the same. If your difficulty is not really enough fuel, the underling bring about may perhaps be a weak fuel pump, limited fuel filter, leaky fuel stress regulator or dirty fuel injectors. Any advise you guys could give me beyond that would be greatly appreciated. The BMW had fault codes 227 and 228 stored (P0171, P0174) indicating a lean fuel system. I replaced the cats and then started getting P0171 and P0174 messages. Can someone help me here and provide a tip as to where it is and how to find it? Also how to figure out it is the fuel filter? Where is the fuel. Code P0171 applies to Bank 1 and P0174 applies to Bank 2. Any ideas?. Note: This DTC is very similar to P0174 BMW, and in fact your vehicle may show both codes at the same time. Gets a P0171 and sometimes also P0174 trouble code, at seemingly random and infrequent times. I too have a K&N filter and after an offroad trip, I started randomly tripping the too lean code so I figured it was just the filter got too dusty (even though I'd think it'd be a low air flow code if that was the case), but I cleaned it anyway even though it had only been about 3 months since the last time. This is a great video on using fuel trim. Seems kind of low. ) * Mass Airflow Sensor (MAF) * Plugged Fuel Filter or weak Fuel Pump * Plugged or dirty Fuel Injectors Common Misdiagnosis * Oxygen Sensors Polluting Gases Expelled. If the total corrective value is above a calibrated threshold for than 30 seconds, a fault is set. Hey guys, today I have a 2007 BMW 328i and I just wanted to share a quick tip for anyone that is having trouble with a check engine light and codes P0171 or P0174. Computer codes = P0174 Bank 2 P0171 Bank 1. Most of the time though, the ECU will compensate for the reduced fuel volume. P0171 A bank combustion too lean: Air intake leak between MAFS and throttle Fuel filter, system blockage Fuel injector blockage Fuel pressure regulator failure (low fuel pressure) Low fuel pump output HO2S harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECTS, MAFS, IATS, TPS P0174 B bank combustion too. P0171 = System lean, bank-1 P0174 = System lean, Bank-2 P1343 = Misfire Cyl-1 with fuel cut-off P1349 = Misfire Cyl-4 with fuel cut-off P1351 = Misfire Cyl-5 with fuel cut-off. The wiki has a good troubleshooting link. Technical Description: The engine is running lean on bank 1, meaning the air to fuel ratio is biased towards air. Yea, there's just so many things that can cause a P0171 fault It could be a vacuum leak. No luck Maybe fuel pressure, so I changed the Fuel filter. I understood the bank 1 and bank 2 to be the two sides of the engine and when both P0171 and P0174 appear simultaneously that is it more likely due to a fuel delivery issue or a vaccuum leak both of which would affect all cyclinders. P0174 and P0300 r codes. If the problem persist the front oxygen (O2) sensor may need to be replaced. DIRTY MAF SENSOR. Hello Gents, I'm REALLY bummed that the troubleshooting of this issue was abandoned. Going to check all the vacuum hoses tonight and I want to replace the fuel filter if I can (it sits on the driveway 6 months of the year). The car runs and drives great. Should be 60-65. Possible Causes and Repair Information for P0171 Toyota code. P0171 Fuel System Bank 1 Sensor 1 Lean - The Powertrain Control Module (PCM) multiplies the short term adaptive value and the long term adaptive value together. the fuel pump while the fuel line at the fuel filter was disconnected. Fired-up Torque and the codes P0171 and P0174 came forth from the engine management system. 7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0171 is triggered. this won't hurt anything, you'll just be down on top end power. 5 ecoboost it has about 55000 miles (125000km) on it never been abused was a executive car bought it with 47000 miles on it. Cause of P0171, P0174 and check engine light. Discussion in 'E39 Might be time for a fuel filter (includes fuel pressure regulator. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. You can confirm the engine is running lean by looking at Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel). DIRTY MAF SENSOR. Computer codes = P0174 Bank 2 P0171 Bank 1. BMW: 2001 bmw 325i I am getting codes p1083 p1085 p0171 p0174. It can be caused by a faulty MAF, faulty oxygen sensor, low fuel pressure and vacuum leaks. I have a 96 ford explorer, both the p0171 and p0174 codes are on. Additional Causes of Code P0171/P0174 * A plugged Fuel Filter or poorly functioning Fuel Pump can set the P0171 code. Check pressure at the rail is most conclusive. There were no hose clamps. Re: Lean codes P0171 P0174 need suggestions Post by terd_ferguson_1 » Tue Jul 29, 2014 5:26 am If your running the stock intake, something to try is ensure you have a Motorcraft air filter installed, some aftermarket filters can cause issues, as well on your filter door from factory it came with a foam tape on the sides and either bottom or. On my 02 S55 160k miles I've been trying to solve these codes. Q: I have codes p0171 p0174 and p1083. The P0171 and P0174 problem was fixed. Additional Causes of Code P0171/P0174. In case the dilemma is not sufficient fuel, the underling lead to could be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors. P0171: System Too Lean Bank 1. Last week my Check Engine light went on. Search this site. Remember parts stores have employees that have good intentions but they may not have. Insufficent egr flow could also be a vcauum issue since the valve is managed by vacuum. Here is a discussion of their meaning and their common causes. Note: This DTC is very similar to P0174 BMW, and in fact your vehicle may show both codes at the same time. Fuel Pressure Incorrect fuel pressure from the fuel pump can also rarely cause a lean condition. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. It came back on after couple days later. This is a list of actions I've taken to try clear the issues: 2x new MAF sensors Smoke test on vacuum lines to inlet manifold 2x new upper O2 sensors Full Jaguar diagnostic (they are unable to find the cause of the issue). Tail Light Change 2012 2014 Chevrolet Sonic 2012 Chevrolet Sonic LT 4 Sedan Chevy Cruze Motor Oil Replace the cabin air filter on a Chevrolet T300 2012 2016 Chevrolet. Any suggestions where to start or things that can be easily eliminated as non. New k&n filters 3. Inspect for dirty fuel filter and proper fuel pressure. P0171 and P0174 12-12-2013 03:44 PM #6. One with the most typical causes of Ford P0171 and P0174 lean codes is actually a dirty mass airflow (MAF) sensor. I don't understand how fuel levels effect it. If the problem persists the front oxygen (O2) sensor may need to be replaced. A code P0174 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty. I had the same codes p0171 and p0174. Additional Causes of Code P0171/P0174 * A plugged Fuel Filter or poorly functioning Fuel Pump can set the P0171 code. (Lean in Banks' 1 and 2). Possible Causes and Repair Information for P0171 Toyota code. This tank I added the top fuel system cleaner, figuring it couldn't hurt. … read more. )Mass Airflow Sensor (MAF)Plugged Fuel Filter or weak Fuel PumpPlugged or. Remember parts stores have employees that have good intentions but they may not have. Fuel filter, pump, or vac hoses to the pressure regulator. 0 with a P0171 and P0174 DTC in memory. My Ford Freestyle. In the event the challenge will not be ample fuel, the underling lead to may well be a weak fuel pump, restricted fuel filter, leaky fuel stress regulator or dirty fuel injectors. So at wits end with this issue. If scan tool does not display DTC P0171 FAILED THIS IGN, see DIAGNOSTIC AIDS. In this video, I will be going over how to confirm you're repair after diagnosing a p0171 or a p0174 system lean bank 1 and system Lean Bank 2. I would guess this is a vacuum leak since I have replaced the Mass Air Flow Sensor and O Ring, Air Filter & Fuel Filter. A couple weeks went by and I started getting a misfire at idle and under load. I had the same codes p0171 and p0174. The fuel filter is in the fuel pump, unfortunately you need to drop the tank to get to both. Put a small hose, like fish tank hose on the nipple and suck on it. One in the most typical leads to of Ford P0171 and P0174 lean codes is often a dirty mass airflow (MAF) sensor. I am going to do spark plugs and a fuel filter but I am just grasping at straws for a solution. P0171 System too Lean (Bank 1) what do replace. Meanwhile, you will experience symptoms like bad fuel economy, rough idle, Check Engine warning light, weak acceleration, and engine stalling. Another Ford TSB for a number of late 90-s Ford vehicles describes a problem with MAF sensor contamination where both codes, P0171 and P0174 would appear together. P0171 and P0174 will be recorded if long term trim remains roughly 10% or higher positive, meaning the ECM is ADDING fuel. Fuel pressure regulator is not leaking and shows no sign of wetness anywhere in hose connected. Code P0171 is described as "Fuel System Too Lean Bank 1" where as Code P0174 is "Fuel System Too Lean Bank 2". And this video will be repairing a vacuum leak and monitoring fuel trim values to verify that the repair was successful using fuel trim values on a scan tool. One in the most typical leads to of Ford P0171 and P0174 lean codes is often a dirty mass airflow (MAF) sensor. Good luck!. Ford MAF sensor. I'm not sure if this is related but the fuel gauge and the rear window stopped working somewhere about the same time. Find many great new & used options and get the best deals for BMW 3 E46 Coupe 1. The BMW E46 digital engine management (DME) systems use a hot-film mass airflow sensor, installed between the air filter housing and the intake manifold, to monitor air flow into the engine intake. Looking for feedback on a persistent issue I've been experiencing over the past 2 months. P0171 Fuel trim bank one condition Lean (If bank one and two codes set together suspect fuel pressure or MAF sensor. Ive got a 97 5. The computer hears (accurately) from the Oxygen Sensor that the Fuel Mixture is too lean so the computer keeps increasing the amount of fuel being delivered into the combustion chambers. Code P0171 applies to Bank 1 and P0174 applies to Bank 2. Mar 26, 2015. The LTFT would show 25% or higher verifying the code that is set. Sailor, what do your tables say for P0171 and P0174? Fuel trims maxing out I suspect. Code P0174 mainly applies to V6 or V8 engines because 4-cylinder engines generally have only one bank, though there are a few exceptions. I would guess this is a vacuum leak since I have replaced the Mass Air Flow Sensor and O Ring, Air Filter & Fuel Filter. So this is one of the least likely causes of a lean code. [2001 BMW 320i] Lean condition P0171 & P0174, fuel trims. Your car has either a P0171, P0174 lean fault code or both stored in the computer, these codes are based on Oxygen Sensor (O-2) readings. Hello there and welcome to the BMW Car Club of America. Both codes are throwing together. 2L engine Have any of you with 3. My only trouble was removing the fuel lines, for my X5 (2003) they had a couple of slip on connectors with green clamps to keep the connectors from slipping off. In plain English, this means that the PCM is adding fuel like crazy to even out the Air/Fuel Mixture because it has detected a vacuum leak in bank 1. I have a 96 Bronco and it has several problems that are driving me nuts. Only after all those can be eliminated do you look at the fuel-air sensor(s). after priming it a few times with KOEO I only. This often is caused by an. Then I read that a possible clogged inline fuel filter may be culprit. I have checked the air intake boots and replaced the fuel filter with no avail. i hadn't driven the car in a while since it's been up for sale. The customers concern is the check engine light on with a Diagnostic trouble code stored in the computer of P0171 indicating the fuel trims are too high and the engine is running lean. Se não houver vazamentos de admissão, o próximo passo é substituir o filtro de ar e limpar o medidor de fluxo de ar. On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. I tried lucas injector cleaner, put about 3 small bottles, did not work but everytime I add a bottle of STP gas treatment with each full tank, the check your engine light. The best way to increase gas mileage is keep the tires inflated to the proper pressure, clean air filter, no extra junk in the trunk and full synthetic oil. 2004 BMW 325i e46 OBD Codes P0174 & P0171 The damn thing was melted, dry rotted, and had completely collapsed. Fired-up Torque and the codes P0171 and P0174 came forth from the engine management system. It came back on after couple days later. I thought a separate ODBII code would show, but some say the P0171 and P0174 would only show for the fuel filter. Creating a Rich Condition to Verify the Lean Condition. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. OE Mass air flow 2. Reset light just for the heck of it and drove out of town shopping and CEL did not come back on until later that night (After approx 60 miles or so). I scanned it and the codes it was throwing was P0171 (System Too lean - Bank 1) & P0174 (System Too Lean - Bank 2). Hello Gents, I'm REALLY bummed that the troubleshooting of this issue was abandoned. Got the code reader out and found errors P0171 (Bank 1 too lean) and P0172 (Bank 2 too lean). If the fuel mixture is (Caused by a bad fuel pump, filter or fuel. This code can also be accompanied by a P0174, which will. What P0171 really means: Over time when the engine wears, parts break, or if measuring sensors become faulty, the computer can make corrections by lengthening the on time for the fuel injectors to richen up the mixture. P0171 P0174 2011 328i 73k miles I have been fighting P0171 P0174 lean codes for months. Intake boots and ccv hoses. If scan tool does not display DTC P0171 FAILED THIS IGN, see DIAGNOSTIC AIDS. MAF looks dirty. Find many great new & used options and get the best deals for BMW 3 E46 Coupe 1. I have replaced mass air flow, fuel pressure regulator, and about a year ago new fuel pump and filter. Fuel pressure to the rail is at 50psi and holds which is what's recommended. The vehicle's ECM will add more fuel to the mixture in order to bring the air fuel mixture where it needs to be for optimal combustion. A plugged Fuel Filter or poorly functioning Fuel Pump can set the P0174 code. But I want to try the easy ones first, like cleaning the MAF sensor. P0171 Should the problem be that there is not enough fuel, you may have a fuel pump that is weak, a fuel filter that is restricted. Check pressure at the rail is most conclusive. The customers concern is the check engine light on with a Diagnostic trouble code stored in the computer of P0171 indicating the fuel trims are too high and the engine is running lean. In plain English, this means that the PCM is adding fuel like crazy to even out the Air/Fuel Mixture because it has detected a vacuum leak in bank 1.