Po174 code bmw

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 ...

I'm actually experiencing the same codes too: (P0171/P0174) on my: 01 BMW X5 4.4i E53/M62 engine type I've cleaned the air mass sensor, but after a few driving around same codes came back again. If that is the same case for me, it would be great!!! but if not, imagine trowing:$245.17 for my Part number: 13 62 1 433 567 @ Germanautoparts.com and ...Engine code PO171 & PO174 Those codes mean your engine is running too lean - P0171 for bank 1 and P0174 for bank 2. And yes, very definitely leaving a bolt out of the intake plenum will cause a lean condition because unmetered air is getting into the engine.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 …Here's how to address the P0174 code in your BMW 5 Series. Understanding the P0174 Code. Before diving into solutions, it's crucial to understand what the P0174 code means. This code indicates that the fuel system on the engine's bank 2 is too lean. The engine control unit (ECU) detects this through oxygen sensors that monitor the amount of ...Har du problem med OBDII-kod P0174 på din BMW? Läs om möjliga orsaker, symptom och lösningar på AutoCodes.com, den bästa länken för bilreparation.

One of the most common trouble codes with the Chevy Silverado is P0174. It indicates that your Chevy Silverado is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list ofCommon Misconception: When an engine misfires, the cylinder runs lean, not rich, this is because the air to fuel ratio favors air by 14x. Therefore, an engine must be running properly without cylinder misfires to avoid lean mixture codes. Optimum air to fuel mixture (14 to 1) is called stoichiometric, which means: chemically balanced.The engine …Obd2 code p0174 fix on 2003 bmw 525i. P0171 p0174 gmP0171 / p0174 Ford sensor dpfe ranger egr location codes p0171 valve p0174 lean gas v10 fix p1406 code exhaust 2008 recirculation badFord p0174 lean p0171 code codes f150 po174 2003 po171 escape bank 2004 aa1car library engine 2001 spark plugs gas.2003 X5 3.0 engine. Installed new plugs water oil seperator and all hoses with dip stick tube, DISA valve, checked all sensors, ok code PO174 keeps coming up. When first starting the engine it runs a little rough for about 60 seconds then clears out. Vehicle runs great lots of power etc. Thoughts!BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > P0174 Code - Bank 2 too lean ... ok so a buddy's car threw this code (only this code, nothing for Bank 1). I've been looking up possible causes for it and how to diagnose.The P0125 code indicates a problem in the cooling system, likely with the Engine Coolant Temperature (ECT) sensor. It could be one or more of the following problems: Defective ECT sensor. Damage to the ECT sensor. Engine has low coolant. Coolant leaks in the system. Thermostat not opening at the right temperature or stuck open.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.

Sep 10, 2016 · #BMW #E46 #HansGarageCommon fault codes for BMWs. How to diagnose and figure out the exact problem. The codes that came up were p0171 and p0174. I have been reading on forums and believed it is the MAF, but then i read that the code for it is p0170. So I'm a little confused, can anyone help. :dunno: PLEASE, THANKS ... '02 BMW 530i '99 BMW Z3. Save Share. Like. T. TheOleBoy Discussion starter BMW Fault Code Lookup. Enter a BMW fault code (P or hex), complete the captcha, and click "Search". P-Codes will start with a P and are usually generated by generic scanners. Example: P1055. Hex Codes are typically given by more advanced scanners. Examples: 180101 or 1B9308 or 30FF. P0174 indicates Bank 2 of the engine has a lean fuel mixture. Engine Bank 1 is the same side of the engine as Engine Cylinder 1. Engine Bank 2 is the opposite side of the engine. A firing order and cylinder location diagram may be needed to see which side of the engine is Bank 1 or Bank 2.

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The light has since come back on and my scan tool says it's the same codes: P0171, P0174, P0313. Fuel mixture too lean, causing an occasional misfire. Yesterday, I gently cleaned the MAF using electrical contact cleaner (it didn't look dirty, but I cleaned it anyway with three cycles of spraying it then letting it dry).BMW Models. 3 Fanatics (E21 E30 E36 E46 E90 E91 E92 E93 F30) . E46 330Ci P0171 + P0174 fix. Thread starter ... so, just a heads up, it seems the engine light only comes on when both codes get tripped....although your car might run poorly due to a small leak and just one code without any engine light.14/03/2024. The P0174 code is an OBD-II trouble code that stands for "System Too Lean (Bank 2) which signifies that your vehicle's air-fuel ratio is excessively lean (there is more air than fuel in the combustion chamber). In this article, I will be talking about the P0174 trouble code, its symptoms, causes, and how to fix it.BMW code P0174 indicates that the PCM has detected a lean running condition in cylinder bank 2. It also implies that the engine's air/fuel mixture is incorrect, with too much air and inadequate fuel. P0174: The bottom line The code appears as Bank 2 has too much air but less fuel.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 ...

P0174 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 .The BMW Code P0174 refers to a diagnostic trouble code that indicates a lean condition in the engine's bank 2, meaning there is too much air and not enoughSOURCE: POSSIBLE REASON AND SOLUTIONS FOR CODE PO.500,P1083, PO171,PO174 Table of Contents Sec. 1. P0171 Sec. 2. P0174 Sec. 3. P0500 Sec. 4. P1083 (a BMW-specific DTC ...Fuel pressure retention test, drops 10 psi within 20 minutes of having reached 50 psi. Logged 2 sets of data using OBD Fusion: Set 1: Idle warm, don't know if it's closed loop (don't know how to determine open vs closed). Idle Data. Set 2: Cruising warm. Cruising Data.To diagnose the P0174 Nissan code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.A P1400 code is a manufacturer specific trouble code related to vehicles such as BMW, Chevrolet, Ford, Mitsubishi, and Nissan and refers to failure for the Emissions Reduction Control System when performing a cold start. The purpose of the catalytic converter or to perform properly, which is efficiently reducing emissions, it must be maintained ...INSTALLED NEW BMW VALVE COVER. PART COST 529.00. TAKES 2 HOUR TO DO ITPO171 and PO174 codes in a Ford vehicle indicate a lean condition in the engine's air-fuel mixture. This means that there is too much air and not enough fuel entering the combustion chamber. ... Introducing the Dark Side of the 1995 BMW 850CSi: Problems and Complaints Unveiling the untold tales of the legendary 1995 Read more. GMC Sierra 2500 ...Dec 8, 2019 ... Comments7 · HOW TO FIX P0171 & P0174 Codes + COMMON E46 VACUUM LEAKS · BMW P0171 P0174 2883 2882 Bank 1/2 Lean Code diagnostics and vacuum leak&nb...

Tech Notes. The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 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 ...

Code Reader https://amzn.to/3ES6aK0 Well it something happened when I changed the CCV Valve, VCG and the Sparkplugs in my E46 BMW 325xi. After I got it all...I have a 2003 bmw e39 530i with 197k miles on it. I got a P0171 code and P0174 code about 2 months ago. I bought new Bosch 02 sensors because I have the money. ... I changed my o2 sensors but still get a code, before it was adaptation limit bank 1 and 2, now its oxygen sensor output! Didnt check it last week, but its probably still there.As with many cars, the EML on a BMW is the engine management light. When the engine management light shows on a dashboard, it means the computers aboard the car have detected a pro...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 P0174 code is thrown when the bank two sensor one O2 sensor reports that your Impala’s engine is running lean. Swap Test. If your Impala has P0174 without P0171 present, you can swap the bank one and two O2 sensors and see if the code “jumps” to the other bank. Here’s what you do. Clear the diagnostic trouble codes with your …Dec 2, 2019 · Hello guys, I got these 3 codes on my OBD scanner with a car who doesn't start. P0313 Misfire Detected With Low Fuel (I had low fuel at the time of the test) P0171 System Too Lean - Bank 1. P0174 System Too Lean - Bank 2. All start-up with the broken fuel pump, which I changed (with a cheap one, after all is a 2005 325XI with 280K km). Code P0171 applies to Bank 1 and P0174 applies to Bank 2. Code P0174 mainly applies to V6 or V8 engines because 4-cylinder engines generally have only one bank, though there are a few exceptions. Some of the high performance 4-cylinder and straight 6-cylinder engines (such as those in BMW and Lexus) split the cylinders into groups of two or ...E93 335i P0174 code. 2008 E93 w/N54 engine that is new to me (67k miles). I got curious, and hooked up my scanner, and it showed a pending P0174 code (Lean, bank 2). I cleared the codes, and cleared adaptive values, and so far, it has not come back. However, looking at the long term fuel trim, bank 2 is twice that of bank 1.Tools needed for diagnosing advanced P0171 code causes: OBD II scanner or code reader. Carburetor or throttle body cleaner. 1. Disconnected or Leaking Hoses. Air Intake Hose: Find the air intake hose that connects to the engine. Grab and shake it so you can feel if anything is loose.

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What Does Code P0175 Mean? P0175 definition: Bank 2 has too much fuel or not enough air; Issue Severity: MODERATE– Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid damage to spark plugs, pistons, and catalytic converters. Diagnosis: It is important to …Definition: System Too Lean Bank 2. The P0174 engine code indicates that your car's air-fuel ratio is too lean. The gas in your car has to be mixed with oxygen before it can combust and power your vehicle. When the air and gas are present in the right ratio (known as the stoichiometric ratio or "stoich"), the mixture burns completely.2003 bmw 330ci, check engine ligth on, code po174. also just started Check Details 2005 bmw m3. Bmw 325i engine diagram2005 bmw 330xi compensating element. valve 2003 bmw 330ci, check engine ligth on, code po174. also just started.. 2005 BMW M3 | Autos Gallery Check Details BMW 330xi O-ring. 7X2, 5 - 11427549573 - Genuine BMW Part Check DetailsWhen a vehicle has the fault code P0171, it means that computer can no longer automatically adjust the mixture between air and fuel. Code P0171 applies to 4-cylinder engines (Bank 1) as they generally have only one bank. If you have a V6 or V8 engine you can also get a P0174 code which refers to Bank 2. When the code says that the fuel system ...On 2 occasions, the P0171 & P0174 were accompanied with a P2231 Code (O2 Bank 1 - Sensor 1: Signal Circuit Shorted To Heater Circuit). that was on 2 of the 12 occassions that the car has thrown the P0171 & P0174 codes. The code Reader I have will also read "Freeze Frame Data" as well as "I/M Monitor Data".Fuel trims - where to begin your diagnosis (p0171, p0172, p0174, p0175Accord p0171 p0174 airflow Acura running rich repairP0172 p0171 bmw code p0174 vw p1136 325i audi p1138 engine. Airflow p0174 accord p0171 onesAccord coupe honda v6 ex carsbase pic P0171 or p0174 - honda accord - cleaning the mass airflow sensorHonda accord ex-l v6 ...However, after turning on the engine, a scan of current codes only revealed the P0174 - System Too Lean (Bank 2), with the module Fuel and Air Metering. I went ahead and cleared the SES light. It did not return immediately or anything after clearing it, but of course the vehicle was idling.I have a 2002 bmw 325i my vehicle act like it want to shut off. engine light come on code was checked po174 bank 2 running lean.525 I: 2002 BMW 525 CODE PO174. Customer Question. 2002 BMW 525 CODE PO174... 2002 BMW 525 CODE PO174. Submitted: 9 years ago. Category: BMW. Ask Your Own BMW Question. Share this conversation. Answered in 42 minutes by: 5/29/2014.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 ...Top 10 Most Searched Fault Codes. This page contains the top 10 most searched BMW P and hex fault codes using this site. P Codes ….

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 ...What causes the P0174 code on a Toyota? There are several potential causes for the P0174 code, including a faulty mass airflow sensor, clogged fuel injectors, a vacuum leak, a malfunctioning oxygen sensor, or an issue with the fuel pressure regulator. Additionally, a dirty air filter or a weak fuel pump can also contribute to the problem.I drive a 2002 525i wagon as a daily drive with 165000 on the clock, and a 2004 M3 on the weekends. The 525i started throwing po171 and po174 codes fairly frequently, maybe once every 50 to 100 miles. Freeze frame data seemed to indicate that the issues occurred under load, but that wasn't conclusive, as sometimes it happened under moderate ...The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video,...Welcome to ShopLifeTV!In this video I go over the most common causes for the p0171 and p0174 codes. These codes are set by the o2 sensors detecting a lean co...Code Reader https://amzn.to/3ES6aK0 Well it something happened when I changed the CCV Valve, VCG and the Sparkplugs in my E46 BMW 325xi. After I got it all...One of the most common trouble codes with the Chevy Silverado is P0174. It indicates that your Chevy Silverado is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list of1983 - 2012 Ranger & B-Series - The dreaded po171 and po174 codes - My check engine light has been on for a while and i finally took it to auto zone for diagnostics, and the scan tool produced the codes po171 and po174. If I reset the computer the check engine light will stay off as long as the outside temperature is...R. rav31. 2356 posts · Joined 2009. #2 · Dec 13, 2020. BiGPiR_ said: Well, a quick search brought up this: P0456 BMW Meaning. The evaporative system monitoring permits the detection of leaks in the evaporative system with a diameter of 0.02 inches and up. By means of a Diagnostic Module Tank Leakage (DMTL), an electrically actuated pump ... Po174 code bmw, 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 ..., 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., What is the Cost to Diagnose the Code? Labor: 1.0. The cost to diagnose the P0174 Dodge code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour., As with many cars, the EML on a BMW is the engine management light. When the engine management light shows on a dashboard, it means the computers aboard the car have detected a pro..., i have an 03 x5 with 3.0 motorthat has a po174 code which says bank 2 o2 sensor is running lean.does that mean one or two injectors are dirty or the rear o2 sensor is getting lazy.this happened after ichanged the oil with castrol edge synthetic,flushed coolant and used oe antifreeze ... What would cause all 4 Lamba signal codes? 2003 BMW 540 ..., PAY IT FORWARD . . . Please help me keep all my resources FREE for everyone to learn from and use. DONATE any amount here https://www.paypal.com/donat..., The code is caused by the O2 sensor detecting too much oxygen in the exhaust gas vs what should be there based on how much air and fuel went in (according to its sensors). This is a generic ODB code so you'll get a lot of hits for other cars when you search. The "classic" cause of this is a bad O2 sensor, bad MAF sensor, or a vacuum leak., uneventickover fault codes po171 po174 are showing up - BMW 2005 525i Touring question. Search Fixya. Browse Categories Answer Questions . 2005 BMW 525i Touring; BMW 525i Car and Truck ... Sec. 4. P1083 (a BMW-specific DTC Code) SEC. 1-----P0171 OBD-II Trouble Code Technical Description System Too Lean (Bank 1) ..., I went through many posts regarding the 2 codes. 3 years back I replaced the boot and the car ran fine. Then last year I had white smoke coming from P0171 and P0174 on 2005 X3 - Xoutpost.com, 1 Answer. Code po444 is referencing a purge control problem. this could be a bad connection or a problem with the purge solenoid for the evaporative system (EVAP). this is controlled by the PCM to allow fuel vapours to be drawn into the engine and burnt from the gas tank under certain conditions. the p0174 is a lean running condition on bank 2 ..., P0171 and P0174 codes after changing Valve Cover Gasket. Recently bought my 2001 BMW Z3 Roadster 2.5L. It had a leaking valve cover gasket so I replaced the gasket with a FelPro one including the bolt rubber grommets. After changing the gasket (no more leaks) The Service Engine soon light came on. I pulled the codes and it has …, W. Wulff Discussion starter · Jan 1, 2009. As everyone probably knows this code means "lean on bank 1" this caused me to fail the AZ emission test so I looked around on here and found a lot of people were getting code PO171 and PO174 due to a leaky air intake ducting. I found the lower duct (the $17 large one that hooks to the throttle body ..., 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!, Diagnostic trouble code (DTC) P0174 stands for "System Too Lean (Cylinder Bank 2).". Your vehicle's powertrain control module (PCM) will log this trouble code if it detects a lean running condition in the engine's cylinder bank 2. The usual causes of a P0174 code are outdated PCM software, vacuum leaks, a bad mass airflow sensor, faulty ..., If the P0171 is combined with the P0174 code, it's very 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 air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced. ⚠ Check if your Chrysler have Safety Recalls., 2003 bmw 325 xi code p1620 / p0171 / p0174. My name is ***** ***** it will be my pleasure to assist you today. 1620 indicates a bad thermostat - you need to replace yours, I would also replace the water pump at the same time. the other codes indicate a lean running condition., Bmw x5 3.5d engine idleEngine bmw x5 xdrive 40e phev 2.0 Purchase used 2010 bmw x5 xdrive 4.8i in knoxville, tennessee, united statesBmw code p0171 x5 e70 p0174 fix f15 e53. 2012 x5 diesel reduced power with lots of codesEngine x5 moteur proxyparts f15 40e xdrive silnika overhaul onderdelenlijn n20 2010 bmw x5 3.0d m-sport xdrive ..., Fixing BMW 7-Series F01 P0174: System Too Lean (Bank 2) If you're driving a BMW 7-Series F01 and encounter the P0174 error code, it indicates that your vehicle's ..., The P0174 code is thrown when the bank two sensor one O2 sensor reports that your Ranger's engine is running lean. Swap Test. If your Ranger has P0174 without P0171 present, you can swap the bank one and two O2 sensors and see if the code "jumps" to the other bank. Here's what you do. Clear the diagnostic trouble codes with your scanner., 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., How to Troubleshoot and Fix the P0174 System Too Lean Fault in Your BMW 5 Series. The BMW 5 Series is known for its performance and luxury, but like any vehicle, it can encounter issues. One common problem is the P0174 fault code, indicating that the engine is running too lean., Even slight variations in the air/fuel mixture will cause the converter temperature to rise significantly. The "Catalytic Converter Efficiency" Diagnostic Trouble Codes (DTCs) P0420 and P0430, are among the top 10 DTCs technicians face. And while the description might imply a failed converter, odds are the ultimate fault lies somewhere else., The P0174 code is thrown when the bank two sensor one O2 sensor reports that your Murano's engine is running lean. Swap Test. If your Murano has P0174 without P0171 present, you can swap the bank one and two O2 sensors and see if the code "jumps" to the other bank. Here's what you do. Clear the diagnostic trouble codes with your scanner., P0171 and P0174. If your "check engine" light is on, and you've used an OBDII scanner tool to read the fault codes, and they returned P0171 and P0174, this …, 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..., Location: CA, United States. iTrader: ( 1) HELP! P0171 P0174 lean codes, fighting for months. P0171 P0174. 2011 328i 73k miles. I have been fighting P0171 P0174 lean codes for months. I hope people can give me some insights. I have searched countless articles about this, and I hope I can pinpoint the issue given my unique symptoms., 2003 X5 3.0 engine. Installed new plugs water oil seperator and all hoses with dip stick tube, DISA valve, checked all sensors, ok code PO174 keeps coming up. When first starting the engine it runs a little rough for about 60 seconds then clears out. Vehicle runs great lots of power etc. Thoughts!, Check engine light is on, PO171 and PO174 codes, fuel trim. check engine light is on, PO171 and PO174 codes, fuel trim long at 11.7% and short term at 15% =- 3-4% this triggers code, may have manifold leek unable to find, ... Have 2006 BMW X5 with 120k with code P1093 (Pre-catalyst fuel trim too rich bank 2) Code pops 3 drive cycles after reset, Code P0171 applies to Bank 1 and P0174 applies to Bank 2. Code P0174 mainly applies to V6 or V8 engines because 4-cylinder engines generally have only one bank, though there are a few exceptions. Some of the high performance 4-cylinder and straight 6-cylinder engines (such as those in BMW and Lexus) split the cylinders into …, HOW TO FIX CODE P0126 P0128 BMW E46 325i 328i 330i 320i 323i 318i 320d. Check Details. BMW 328i P0306 Misfire Code Repair / BMW Shaking fix Replace Coil pack. Check Details. BMW CODE P0171 P0174 SYSTEM TOO LEAN FIX. VACUUM LEAK BMW E46 E39 E53. Check Details. BMW 330Ci P0171 Code: Fuel System Bank 1 - Q&A, 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 ..., I went through many posts regarding the 2 codes. 3 years back I replaced the boot and the car ran fine. Then last year I had white smoke coming from P0171 and P0174 on 2005 X3 - Xoutpost.com, 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. Code P0171 applies to Bank 1 and P0174 applies to Bank 2. Code P0174 mainly applies to V6 or V8 engines because 4-cylinder engines generally have only one bank, though there are a …