Bmw po174 code

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NEW CCV KIT: http://amzn.to/1U57cspBMW TOOL: http://amzn.to/2lb9iYLHow to diagnose the common P0171 and P0174 lean codes on a BMW M54 engine. Get rid of the ...P0300, P1346, P1344, P1342, P0171 and P0174. Help! So been doing some DIY thanks to this site and still can't solve a problem. Driving a 2001 330i and noticed some rough idle on start with some oil leakage. Eventually I popped a 171, 174 codes with the occasional cylinder misfire.All2kool. 4594 posts · Joined 2016. #3 · Mar 26, 2023. P0171 & P0174 are probably the two most common codes an E46 M54 will produce. Both of these codes are 'lean conditions', which can be caused by any number of issues. At 247k miles, the first thing to check is the Fuel Pump. Visually inspect it.The pattern has repeated without fail for the past several days now. The codes read as P0174 and P1085. I am still reading up on previous posts on these codes. I've dealt with my fair share of lean codes before, including changing the all the rubber boots after MAF, cleaning MAF, CCV overhaul, etc.Since you only have the BANK 2 (cylinders 4,5,6) code you might check a couple of items. 1. make sure all 4 of screw number 13 are tight. 2. Check the condition of cap number 17 on the rear of the intake manifold. 3. Check that the intake manifold nuts number 14 (9 of them) are tight on the manifold. Join BMWCCA.

BMW SUVs are some of the most luxurious and sought-after vehicles on the market. With a variety of models, features, and price points, it can be difficult to know where to start wh...The P0174 Code can come up for many reasons and is one of the most common DTC's your E46 will ever show. Don't take advice from an auto parts counter jockey and buy the parts they suggest. That code could be a MAF, could be a Fuel Pump, could be a Fuel Filter, could be a DISA, could be a vacuum leak, could be any number of things.15 May 2019 ... Comments7 · HOW TO FIX P0171 & P0174 Codes + COMMON E46 VACUUM LEAKS · P0171 Trouble Code: System Too Lean Bank 1 Diagnosis · BMW drivetrai...Tech Notes. The P0174 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0174 is set in along with the P0171 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow ...Answered by a Fixya Expert. Hello, I have a 2010 BMW X3. Got a P00BC, P0171, and P0174 code. Got MAF sensor changed, but mechanic said when he install the new MAF, he got the same code, so he install my old MAF back. Look online about testing MAF sensor. I unplug MAF sensor to test it. I read if engine shuts off when doing this, the MAF is bad.BMW X5 CODE P0171, CODE P0174 FIX EXPLAINED, BMW E70 E53 F15If you have BMW X5 and you have code P0171 or code P0174 we will explain the top reasons that we ...

Previous BMW rides, 91 E30 318IS, 89 E30 325is, 96 E36 328is, 98 E36 M3, 99 E39 540 Sport, 00 368 M Coupe, 01 E46 330Ci, 2003 M3 Carbon Black, 1997 328IS, 2011 335 Sport sedan, ... Only show this user #4 · Apr 29, 2010. SAE Code P0170 DTC Code 16554 Description Fuel Trim, Bank1 Malfunction check for vacuum leaks, o2 …CODE P0171 P0174 SYSTEM TOO LEAN VACUUM LEAK FIX BMW E46 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI If you have BMW and you have code...The P0174 Code can come up for many reasons and is one of the most common DTC's your E46 will ever show. Don't take advice from an auto parts counter jockey and buy the parts they suggest. That code could be a MAF, could be a Fuel Pump, could be a Fuel Filter, could be a DISA, could be a vacuum leak, could be any number of things.IF the fuel pressure is low, it will also cause this code. You can check the Positive Crankcase Ventilation (PCV) system by removing the dip stick. It should have a slight vacuum of about a 1/4 inch of vacuum or 8 to 15 millibar at idle speed. The operating fuel pressure. It should be about 50 PSI at idle speed.

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=============================Claim your FREE engine code eraser 👉 https://free.nonda.co 👈==== How to Fix P0174 ============Engine Code P0174 Saving Repair ...P0171 and P0174 are diagnostic trouble codes for lean condition in bank 1 and bank 2, respectively. These codes indicate that the engine is receiving too much air or not enough fuel, resulting in a lean air/fuel mixture. The potential causes include a vacuum leak, faulty oxygen sensor, clogged fuel injectors, or a malfunctioning mass airflow ...A BMW fault code P0171 or P0174 means that your engine is getting more air than fuel, also known as running "lean". Your BMW engine is equipped with oxygen sensors - small probes that extend into the exhaust system (usually near the catalytic converter) that measure the amount of oxygen left after combustion.This E46 came in with DTC's P0171 & P0174 codes for lean running engine. I go thru some of the common areas to test and how the MAF readings led to finding ...p0174 with misfire P1343 p1345 p1347. Some of you may know I have been chasing codes p0171 and 174 at startup and cold idle, I replaced the vacuum hose in the back of the intake for the S.A.P along with the endcaps and cleared the codes. After a cold start I got codes p0174 p1343 p1345 1347, I moved the coils around to see if the misfire …118 posts · Joined 2011. #1 · Jan 16, 2012. Hello, everyone! I just crossed 131k miles and was greeted with the following codes: P0313 misfire detected with low fuel. P0174 bank 2 system too lean. After reading threads on this site I've learned that P0174 is possibly due to a dirty mass air flow sensor?

Causes of Code P0174. To throw a P0174 code, part of your engine is either letting in too much air or not pumping a large enough amount of fuel. In rare instances, the sensor could be faulty. However, a vacuum leak or problem with the fuel pump is the more common culprit. Any crack or leak in the vacuum system will allow …I need some help. It’s a 2002 BMW 325Ci with 143,000 miles. It has started running bad and throwing codes. The P0174 and P0171 codes are the only ones left that I can’t fix. The P0174 codes is always primary. I have 2 scanner tools, the Innova 3100 w/ABS and the Creator tool specific to BMW. I have followed the forum trying to correct the ... BMW X5 CODE P0171, CODE P0174 FIX EXPLAINED, BMW E70 E53 F15If you have BMW X5 and you have code P0171 or code P0174 we will explain the top reasons that we ... p0174 with misfire P1343 p1345 p1347. Some of you may know I have been chasing codes p0171 and 174 at startup and cold idle, I replaced the vacuum hose in the back of the intake for the S.A.P along with the endcaps and cleared the codes. After a cold start I got codes p0174 p1343 p1345 1347, I moved the coils around to see if the misfire … The meaning of fault code P0174. P0174 is triggered when the upstream oxygen sensor on cylinder bank 2 indicates that the conditions are too lean in one of the cylinders. This means that the cylinder has too much air or not enough fuel according to the optimal air-fuel ratio. When the sensor readings show there is too much oxygen, the ... When it comes to luxury SUVs, few brands come close to the quality and style of BMW. But what’s the cost of a BMW SUV? In this article, we’ll explore the various factors that go in...The manufacturer of BMW is Bayerische Motoren Werke, a Bavarian automobile and motorcycle designer and manufacturer famed for its line of luxury sport and family vehicles produced ...693 posts · Joined 2013. #9 · Oct 19, 2013. can't fix p1415,p0171 & p0174 help. Yes, an air leaking will cause erratic engine operation. Special tools are needed when replacing this seal, but it's not that difficult. The belt …Te suministramos todo lo que necesitas saber sobre el código DTC P0174 Descripción, causas, síntomas y posibles soluciones.LEER SOLUCIÓN DEL CÓDIGO OB...Sep 17, 2021 · As you are not getting any trouble codes about the Pre-Cat O2 heaters, change the Pre-Cat O2's. Fuel System Status start in open loop (1). Tries to go to closed loop (2) but the pre-cats are dead so goes to status 8 = faulty pre-cats O2 sensors. Hot Idle. The log starts off in fuel status 1, open loop. Feb 20, 2015 · I need some help. It’s a 2002 BMW 325Ci with 143,000 miles. It has started running bad and throwing codes. The P0174 and P0171 codes are the only ones left that I can’t fix. The P0174 codes is always primary. I have 2 scanner tools, the Innova 3100 w/ABS and the Creator tool specific to BMW. I have followed the forum trying to correct the ...

The BMW had fault codes 227 and 228 stored (P0171, P0174) indicating a lean fuel system. This means the vehicle is running lean and the DME has tried to correct the condition but has reached it upper limit. Fault codes 227 and 228 are specific to a fault when the engine is at part throttle (not idle). This tells us that it’s unlikely the lean ...

Feb 1, 2008 · The fault codes "2882/2883 - fuel trim, mixture too lean" are stored in the DME. CAUSE. Possible causes may include: incorrect air filter, unmetered air or a defective air mass meter. PROCEDURE. Remove and inspect the air filter element. Only the filter with the P/N 13 72 1 744 869 must be fitted. I need some help. It’s a 2002 BMW 325Ci with 143,000 miles. It has started running bad and throwing codes. The P0174 and P0171 codes are the only ones left that I can’t fix. The P0174 codes is always primary. I have 2 scanner tools, the Innova 3100 w/ABS and the Creator tool specific to BMW. I have followed the forum trying to correct the ...The P0444 code relates to the DME detecting an incorrect voltage drop across the purge valve. For some reason it is very particular, so make sure all the connections are tight and clean, you have an OE or genuine BMW purge valve, etc. On a related note, the genuine one has doubled in price over the last two years!So my check engine light came on, I scanned it and it's a P0174 and P0171 code instead of both the P0171 and P0174 codes. I scanned my car and was getting 1.8% to 4.2% air on bank fuel trim 1 and 2 and when I rev my car it …Auto Zone's code is P2240 and P0171 P0174, my own ODB reads P0444 P0171 and P0174. I changed Fuel Filter, disa valve, crank case vent kit, upper and lower intake boots, and etc. Pretty much everything relate to the vacuum leak. I'm thinking about the oxygen sensor is bad now. When engine idle with shift at "D" mode, it vibrates worse …There are several common causes of code P0171 in BMW vehicles: Air intake leaks: Any vacuum leaks in the air intake system can result in an imbalance in the air-fuel mixture. Faulty oxygen sensors: A malfunctioning oxygen sensor can provide incorrect readings, leading to an imbalanced mixture. Dirty or clogged fuel injectors: If the fuel ...The 29E0 BMW code is one of the fault codes that can appear on your BMW’s OBD-II scanner, specifically related to the powertrain. When this code is triggered, it indicates an issue with the fuel mixture in one of the engine’s cylinders. In more technical terms, the code signifies a “Fuel Mixture Control, Mixture Too Lean” condition. The BMW P0170 code is a fault code that indicates a problem with the fuel trim in bank 1 of the engine. This means that the engine is running too lean, which can cause a variety of issues such as poor fuel economy, rough idling, and reduced power. The fuel trim is the amount of fuel that is added or subtracted from the engine’s air/fuel ... 2001 325i p0171,p0174 lean bank 1 and 2 codes. Hello all, Well my story started with my sons 325i and the ck engine light. Yes lean bank 1&2 codes and a variety of missfire codes. I started with the fuel filter which needed replacement. I noticed quite a vacuum in the crank case.Some people said you should have vacuum and some not.

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82. Posts. Drives: 2011 BMW 335is. Join Date: Jan 2016. Location: California. iTrader: ( 2) N54 P0174 Code - Bank 2 Running Lean. Hey guys, I've recently run into a "service engine soon" light so I scanned it and the only code that came up is the P0174 code, bank 2 running lean. My car is a 2011 BMW 335is with the DCT trannsmission.P0300, P1346, P1344, P1342, P0171 and P0174. Help! So been doing some DIY thanks to this site and still can't solve a problem. Driving a 2001 330i and noticed some rough idle on start with some oil leakage. Eventually I popped a 171, 174 codes with the occasional cylinder misfire.#BMW #E46 #HansGarageCommon fault codes for BMWs. How to diagnose and figure out the exact problem.May 2, 2016 · The pattern has repeated without fail for the past several days now. The codes read as P0174 and P1085. I am still reading up on previous posts on these codes. I've dealt with my fair share of lean codes before, including changing the all the rubber boots after MAF, cleaning MAF, CCV overhaul, etc. Basically this P0174 code means that the upstream oxygen sensor in bank 2 reporting a lean condition (too much oxygen in the exhaust). On V6/V8/V10/V12 engines, Bank 2 is the side of the engine that doesn't have cylinder #1. The engine uses what are called O2 or oxygen sensors in the exhaust stream to determine the air to fuel ratio of the ...For example, after clearing the night before and then going for a 10-mile drive in the morning, here are the pending codes from yesterday: P0306,BMW 243, Cylinder 6 Misfire Detected. P1346,BMW 240, Misfire During Start Cylinder 3. P1343,BMW 238, Misfire Cylinder 1 with Fuel Cut-Off.If money is no object, then you may want to consider purchasing a luxury car from a top end automotive manufacturer that has all the bells and whistles. And, when money is not a co...A two-day course at BMW's U.S. headquarters teaches both safety and fun. A free, trimmed down version is coming to a city near you. By clicking "TRY IT", I agree to receive newslet...The most common cause of the P0171 code – and the P0170 and P0173-P0174 codes – is unmetered air entering the combustion system. Most of the time, this happens due to faulty or dirty mass ...The BMW P0170 code is a fault code that indicates a problem with the fuel trim in bank 1 of the engine. This means that the engine is running too lean, which can cause a variety of issues such as poor fuel economy, rough idling, and reduced power. The fuel trim is the amount of fuel that is added or subtracted from the engine’s air/fuel ...Was der P0174-Code bedeutet. Code P0174 zeigt an, dass ein Magerzustand vom Motorsteuergerät (ECM) erkannt wird. Ein magerer Zustand wird erzeugt, wenn zu viel Luft und zu wenig Kraftstoff im Luft-Kraftstoff-Verhältnis (AFR) vorhanden ist. Das ECM ist mit der Fähigkeit ausgestattet, einen mageren Zustand wieder auf normal zu stellen, jedoch ... ….

Previous BMW rides, 91 E30 318IS, 89 E30 325is, 96 E36 328is, 98 E36 M3, 99 E39 540 Sport, 00 368 M Coupe, 01 E46 330Ci, 2003 M3 Carbon Black, 1997 328IS, 2011 335 Sport sedan, ... Only show this user #4 · Apr 29, 2010. SAE Code P0170 DTC Code 16554 Description Fuel Trim, Bank1 Malfunction check for vacuum leaks, o2 …Today we tackle the annoying problem of lean codes on our e46 2003 330CI convertible. This was caused by a vacuum leak on the intake b... Welcome back everyone! Today we tackle the annoying ...The 29E0 BMW code is one of the fault codes that can appear on your BMW’s OBD-II scanner, specifically related to the powertrain. When this code is triggered, it indicates an issue with the fuel mixture in one of the engine’s cylinders. In more technical terms, the code signifies a “Fuel Mixture Control, Mixture Too Lean” condition.As you are not getting any trouble codes about the Pre-Cat O2 heaters, change the Pre-Cat O2's. Fuel System Status start in open loop (1). Tries to go to closed loop (2) but the pre-cats are dead so goes to status 8 = faulty pre-cats O2 sensors. Hot Idle. The log starts off in fuel status 1, open loop.I had the P0171/0174 randomly occurring as well. Advice I received indicated replacing the Intake Boots was in order as this is a common source for a vacuum leak. I replaced the first one off the MAF and the result was just one of the two codes occurring, again, randomly. Replaced the DISA O-Ring, no change.A BMW fault code P0171 or P0174 means that your engine is getting more air than fuel, also known as running "lean". Your BMW engine is equipped with oxygen sensors - small probes that extend into the exhaust system (usually near the catalytic converter) that measure the amount of oxygen left after combustion.Nov 28, 2023 · There are several common causes of code P0171 in BMW vehicles: Air intake leaks: Any vacuum leaks in the air intake system can result in an imbalance in the air-fuel mixture. Faulty oxygen sensors: A malfunctioning oxygen sensor can provide incorrect readings, leading to an imbalanced mixture. Dirty or clogged fuel injectors: If the fuel ... I pulled the P0171 & P0174 Bank 1 and 2 running too lean codes. I checked the main elbow joint on the air intake and it had a huge tear. I tried to tape it as a temp fix but still nothing. ... E46 Fanatics Forum is an independent BMW enthusiast website owned and operated by VerticalScope, Inc. Content on E46 Fanatics Forum is generated by its ... Bmw po174 code, Started driving the E46 to get it ready for smog testing and BAM! Check Engine Light. Codes were P0172 (Too Rich Bank 1) and P0174 (Too Lean Bank 2) Checked the upper and lower intake boots, ICV and throttle body (replaced all the boots and gaskets back in 2013). Also replaced my PCV/CCV then too along with fuel filter, fuel pump, bunch of ..., May 21, 2018 · So codes are p0171 and p0174, I open and check. all in take boots and inspected they are goood. DSAV seems good , gasket seems good and it has functioning well. Idle and Throttle body are good. CCV I found lots oil on hose from VCG to CCV, all over the oil separation and underneath hose to dip stick. So, that has been resolved. , A. armstrst Discussion starter. 10 posts · Joined 2017. #1 · Apr 20, 2017. I have been struggling diagnosing a P0172 code that keeps coming up. I have a diagnostic tool to look at a number of parameters. When I look at fuel trim data I notice the following: When the car is accelerating the long term fuel trim on bank 1 stays around -10% and ..., When the P0174 code sets, the oxygen sensors are detecting too little oxygen in the exhaust and the control module is adding more fuel than normal to sustain the proper …, shanneba. 2557 posts · Joined 2008. #8 · Oct 11, 2010. Since you are only getting P0174 lean on bank 2 (cylinders 4-6) you could check the O2 sensor voltage with diagnostic software like a GT1/DIS Autoenginuity etc. There is an air distribution part on the top of the intake manifold., If you’re looking to upgrade your BMW and get the most out of your vehicle, then you should consider investing in the Shadowline package. This package is designed to give your BMW ..., For example, after clearing the night before and then going for a 10-mile drive in the morning, here are the pending codes from yesterday: P0306,BMW 243, Cylinder 6 Misfire Detected. P1346,BMW 240, Misfire During Start Cylinder 3. P1343,BMW 238, Misfire Cylinder 1 with Fuel Cut-Off., The BMW had fault codes 227 and 228 stored (P0171, P0174) indicating a lean fuel system. This means the vehicle is running lean and the DME has tried to correct the condition but has reached it upper limit. Fault codes 227 and 228 are specific to a fault when the engine is at part throttle (not idle). This tells us that it’s unlikely the lean ..., I had the P0171/0174 randomly occurring as well. Advice I received indicated replacing the Intake Boots was in order as this is a common source for a vacuum leak. I replaced the first one off the MAF and the result was just one of the two codes occurring, again, randomly. Replaced the DISA O-Ring, no change., A BMW fault code P0171 or P0174 means that your engine is getting more air than fuel, also known as running "lean". Your BMW engine is equipped with oxygen sensors - small probes that extend into the exhaust system (usually near the catalytic converter) that measure the amount of oxygen left after combustion., A smoke test should make it show though. Next guess would be a cracked or broken oil return line coming off the CCV valve that goes to the dipstick. My first experience with the P0171 / P0174 codes was the broken oil return line. Second time it was the intake boot. '05 X3 3.0i Alpine White/Gray Leather/Alum., May 2, 2016 · The pattern has repeated without fail for the past several days now. The codes read as P0174 and P1085. I am still reading up on previous posts on these codes. I've dealt with my fair share of lean codes before, including changing the all the rubber boots after MAF, cleaning MAF, CCV overhaul, etc. , The 171/174 lean codes don’t get tripped until fuel trims hit 20%, so your other bank may be 19%. Meanwhile, these engines will signal their lean condition with as little as 3%+ fuel trim, let alone 20%. The codes themselves are only as accurate as the MAF signal compared to lambda and O2 sensor signals., P0174 BMW Code - Mixture Control 2 System Too Lean Bank 2. How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and …, BMW E46 p0174 p0171. have a 2002 325i M54 engine and I keep getting these codes even though I have no vacuum leak, new spark plugs and coils, new DISA valve, me O2 sensors, new valve cover gasket and I just installed new OEM fuel pump. Do you guys think this could be caused by bad oil dipstick seal or bad fuel filter., P0171 and P0174 are diagnostic trouble codes for lean condition in bank 1 and bank 2, respectively. These codes indicate that the engine is receiving too much air or not enough fuel, resulting in a lean air/fuel mixture. The potential causes include a vacuum leak, faulty oxygen sensor, clogged fuel injectors, or a malfunctioning mass airflow ..., Started driving the E46 to get it ready for smog testing and BAM! Check Engine Light. Codes were P0172 (Too Rich Bank 1) and P0174 (Too Lean Bank 2) Checked the upper and lower intake boots, ICV and throttle body (replaced all the boots and gaskets back in 2013). Also replaced my PCV/CCV then too along with fuel filter, fuel …, 693 posts · Joined 2013. #9 · Oct 19, 2013. can't fix p1415,p0171 & p0174 help. Yes, an air leaking will cause erratic engine operation. Special tools are needed when replacing this seal, but it's not that difficult. The belt and crankshaft pulley (6 bolts) need to come out., Jun 28, 2010 · 24183 posts · Joined 2007. #3 · Jun 28, 2010. +1. Auto Zone always says the 0174 is 02 sensors (and it isn't). The codes for 02 are different and while it COULD be 02 sensor related, it is likely a vacuum leak. Usually a hole in the intake boot tract. Check out my YouTube Channel for DIY's and other fun stuff HERE. , There are several common causes of code P0171 in BMW vehicles: Air intake leaks: Any vacuum leaks in the air intake system can result in an imbalance in the air-fuel mixture. Faulty oxygen sensors: A malfunctioning oxygen sensor can provide incorrect readings, leading to an imbalanced mixture. Dirty or clogged fuel injectors: If the fuel ..., 5 Jun 2015 ... Comments1K · BMW 330i 325i E46 CCV Replace & Intake Removal DIY (Part 1) - See It Clearly! · HOW TO FIX P0171 & P0174 Codes + COMMON E46 VACUUM..., CODE P0171 P0174 SYSTEM TOO LEAN VACUUM LEAK FIX BMW E46 325I 330I 328I 320I 323i 325xi 328xi 330xi 320xi 330CI 325CI 320CI If you have BMW and you have code..., Common Causes of a PO174 Code in Ford Vehicles. There are several common causes for a P0174 code in Ford vehicles. These include: Intake air leaks: Any cracks or loose connections in the intake system can result in unmetered air entering the engine, causing a lean condition. Faulty oxygen sensors: Oxygen sensors measure the amount of oxygen in ..., When the BMW P0175 code appears, it indicates that the Mixture Control 2 System is Too Rich Bank 2. This means that there is an issue with the fuel system, which is causing the engine to run too rich. Here are some of the symptoms that you may experience if your BMW is affected by this code: Check Engine Light – The most common symptom of the ..., Previous BMW rides, 91 E30 318IS, 89 E30 325is, 96 E36 328is, 98 E36 M3, 99 E39 540 Sport, 00 368 M Coupe, 01 E46 330Ci, 2003 M3 Carbon Black, 1997 328IS, 2011 335 Sport sedan, ... Only show this user #4 · Apr 29, 2010. SAE Code P0170 DTC Code 16554 Description Fuel Trim, Bank1 Malfunction check for vacuum leaks, o2 …, BMW P0171 Code : Mixture Control System Too Lean. As a car owner, it can be frustrating to see the check engine light come on. One of the most common engine codes that BMW drivers may encounter is the P0171 code. This code indicates that the engine’s mixture control system is too lean, which can lead to a variety of issues. In this article ..., This E46 came in with DTC's P0171 & P0174 codes for lean running engine. I go thru some of the common areas to test and how the MAF readings led to finding ..., =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈===== How to Fix P0171 =====Engine Code P0171 Saving Repair..., May 21, 2018 · So codes are p0171 and p0174, I open and check. all in take boots and inspected they are goood. DSAV seems good , gasket seems good and it has functioning well. Idle and Throttle body are good. CCV I found lots oil on hose from VCG to CCV, all over the oil separation and underneath hose to dip stick. So, that has been resolved. , The P0174 code in a BMW indicates that the engine’s control module has detected a lean condition on bank 2 of the engine. This means that there is an imbalance …, Contact Us Email. BMW of Tampa. 109 East Fowler Avenue Tampa, FL 33612. Sales: (813) 733-6246 Service: (813) 680-2445 Parts: (813) 733-6303, The most fuel-efficient combustion engines have 14.7 parts air to 1 part fuel in the mixture. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition occurs, and the P0174 code is activated. A lean state can be caused by a vacuum leak, which adds extra air to the air-fuel combination, or by a faulty fuel system, which injects insufficient fuel into the ..., Dec 8, 2011 · Since you only have the BANK 2 (cylinders 4,5,6) code you might check a couple of items. 1. make sure all 4 of screw number 13 are tight. 2. Check the condition of cap number 17 on the rear of the intake manifold. 3. Check that the intake manifold nuts number 14 (9 of them) are tight on the manifold. Join BMWCCA.