Chevy trax p0171

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Q: What is P0171 in Chevy Trax and why is it important? A: P0171 is a diagnostic trouble code that indicates a lean mixture condition in the engine of Chevy Trax vehicles. It is important to address this issue as soon as possible to prevent potential damage to the engine and to ensure optimal vehicle performance.1 post · Joined 2023. #1 · Nov 21, 2023. I have a 2017 that has occasionally started shuttering while driving at high speeds. The fuel pressure is at 42psi and the fuel pressure sensor reads the same. There is no P0087 code yet or any other codes. The long term fuel trim is at 10% so it is lean. I believe I should be seeing around 60psi.2017 Chevy Trax LT No Heat and P0171 Code. I own a 2017 Chevy Trax LT and when I put the heat on the highest level (4) there is no heat, but any level below that it works fine. ALSO, for the P0171 code, I did all the tests looking for a leak, I changed parts, and I have had no luck, the light is still on and the car still runs rough.These are the conditions for the code P0171 to set : * The engine is in Closed Loop status. * The catalyst monitor diagnostic intrusive test, post 02 diagnostic intrusive test, and EVAP diagnostic test are not active. * The engine coolant temperature (ECT) is between -20°C and +150°C (-4°F and +302°F). * The intake air temperature (IAT) is ...Jul 11, 2020 · 3 posts · Joined 2021. #17 · Jun 4, 2021. Hello, I’m having issues with my P0299 code on my 2015 Buick Encore (I know it’s not Chevy Trax but the people posting seem to have knowledge on what’s going on). I first got the code and pulled the turbo and there was a crack on the inside of the turbo, obviously bad. Everything you need to know about diagnosing a MAP sensor problem on a Chevy Equinox (Also Applies To Most Other Vehicles)24 posts · Joined 2015. #1 · Mar 11, 2021 (Edited) I am getting P0131, P0137, and P0171 codes on my 2015 Chevrolet Cruze. Data is as follows: Fuel Sys: CL. Calc Load: 18.4%.

May 10, 2023 · A very common reason for the Service Stabilitrak message is a misfiring engine. If the OBD scanner gives codes P0301 to P0304, for example, then that means a misfiring cylinder. The last digit is the cylinder number. Cylinders will misfire if spark plugs or the coils need to be replaced. Get ratings and reviews for the top 12 foundation companies in Chevy Chase, MD. Helping you find the best foundation companies for the job. Expert Advice On Improving Your Home All...A very common reason for the Service Stabilitrak message is a misfiring engine. If the OBD scanner gives codes P0301 to P0304, for example, then that means a misfiring cylinder. The last digit is the cylinder number. Cylinders will misfire if spark plugs or the coils need to be replaced.Fuel Injectors. P0171 indicates that your Chevy Trailblazer is either getting too much air or not enough fuel. A clogged or damaged fuel injector will cause the air-fuel mixture to lean out in one specific cylinder. You may see a cylinder misfire code or fuel injector-specific code with P0171.Mar 17, 2023 · The P0171 code indicates that the oxygen (O2) sensor on bank 1 sent a signal to the engine control module that the air-fuel mixture is too lean to be corrected. The O2 sensors have the ability to correct a fuel mixture of +-15%. If it needs to be corrected more than that, the P0171 code will be stored. Nov 26, 2022 · Today we go over the diagnosis and fix for this lean condition p0171 on this 2017 Holden Trax, previously serviced by another mechanic a few weeks prior, the... Apr 28, 2023 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...

If your Chevy Trax is jerking when you press the accelerator, a few common issues can cause this. This guide is built to help you get a better idea as to why your vehicle is jerking. ... P0171 or P0172 (too rich or too lean). There are a ton of 02 sensor codes: A lean or rich air-fuel mixture is usually caused by a bad O2 sensor or MAP/MAF ... Chevrolet Sonic, or 2014 model year Chevrolet TRAX vehicle, your satisfaction with our product is very important to us. This letter is intended to make you aware that some 2014 model year Buick Encore, 2011 - 2014 model year Chevrolet Cruze, 2012 - 2014 model year Chevrolet Sonic, and 2014 model year Chevrolet TRAX vehicles, equipped with a 1.4L Mar 15, 2017 ... In this video we discuss common causes and repair for code P0171. the subject vehicle is a 2006 Chevy Equinox equipped with the 3.4L engine.2017 Chevy Trax LT No Heat and P0171 Code. I own a 2017 Chevy Trax LT and when I put the heat on the highest level (4) there is no heat, but any level below that it works fine. ALSO, for the P0171 code, I did all the tests looking for a leak, I changed parts, and I have had no luck, the light is still on and the car still runs rough.

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A friend of mine has a 2013 Chevy Cruze (1.4L) with the following codes: P0171: System Too Lean (Bank 1) P015B: O2 sensor Delayed Response - Lean to Rich Bank 1 Sensor 1. P1101: Intake Air Flow System Performance. P2270: O2 Sensor Signal Stuck Lean - Bank 1\, Sensor 2. I need to ask him what symptoms he is experiencing (I think maybe some rough ...Refer to your vehicle’s service manual to locate and inspect the IAC valve for any signs of damage or malfunction. Clean or replace the valve if needed. 3. Check the throttle body: The throttle body can also be the cause of a P0507 code. Inspect the throttle body for any signs of damage or buildup of dirt and debris.If your Chevy Trax is giving you a P0171 code, it means that the engine is running lean. This can be caused by a number of different things, but the most common culprit is a dirty or damaged mass air flow sensor. Other possible causes include a vacuum leak, faulty fuel injectors, or a problem with the oxygen sensor.2011-2016 Cruze/Sonic/Trax 1.4L Turbo Intake Manifold PCV Check Valve Fix: ... The P0171 started to come back on within a couple of weeks of the new manifold going on, so if it failed again, it failed pretty quick. ... CruzeTalk.com forum, news, discussions and the best community for owners to discuss all things related to the …Jul 28, 2022 · Gm’s 1.4L turbocharged 4-cylinder engine, commonly found in the Chevy Sonic, Cruze and Buick Encore, has a well-known issue resulting in a lean code, P0171, ...

2016 Chevy Trax - P0171 code. Got it scanned and it says “Bank 1 system too lean” other scanner said “fuel trim system lean”. Went ahead and changed the upstream o2 sensor and the check engine light went away. Drove the car and everything was fine until I put gas in the car and it shook for about 30 seconds after I turned the car back on.28 posts · Joined 2024. #3 · Feb 19, 2024. spark plug wire insulation does not last 10 years without drying/degrading significantly - the sparks may be shorting to block through the old insulation. don't verify it by touching the wire while engine is running. In 100% darkness with hood open and engine running you may be able to see the arcing ...Buy YOUCANIC Pro Scanner https://www.youcanic.com/scanner/Get Factory Service Repair Manuals & Specs https://www.youcanic.com/manualsAsk Car Questions & Get ...Figured maybe the shop got a bit sloppy, and didn't think much more of it at the time. Next day the check engine light came on. Went to Advance, got it read, and it kicked out P1101 and P0171. Judging from what I've read, this could be MAF, vacuum leak, or others. But, I also found a thread that said these codes kicked out when the oil cap …Clear. Shop Chevrolet Trax vehicles in Chicago, IL for sale at Cars.com. Research, compare, and save listings, or contact sellers directly from 189 Trax models in Chicago, IL.Chevy Trax General Discussion Code 84. Jump to Latest ... My actual engine code lights are p0068, p0097, p00f4, p0106, p0113, p0171, p01101, p0102, p2227, p2228. The car only shakes when in idle (park, neutral, drive) but if the car is moving the engine is not shaking. Just replaced my coolant temperature sensor last night and …They replaced the valve cover, camshaft cover and the intake manifold. Also the found a missing pcv hose and replaced it. The codes that they found were p0171,p1101, and p0108. All of this was replaced under the power-train warranty. I was told this is a common problem and they have updated what they replaced so it shouldn't happen …El código de falla P0171 es un problema común en los vehículos Chevy Trax, que indica una mezcla de combustible y aire demasiado delgada en el motor. Si no se aborda adecuadamente, puede llevar a problemas más graves como daños en el motor o en el sistema de escape. Es importante saber cómo diagnosticar y solucionar este problema …A friend of mine has a 2013 Chevy Cruze (1.4L) with the following codes: P0171: System Too Lean (Bank 1) P015B: O2 sensor Delayed Response - Lean to Rich Bank 1 Sensor 1. P1101: Intake Air Flow System Performance. P2270: O2 Sensor Signal Stuck Lean - Bank 1\, Sensor 2. I need to ask him what symptoms he is experiencing (I think maybe some rough ...

Dec 13, 2021 ... If you drive an Buick Encore, Chevy Sonic or a Chevy Cruze and have these codes p015B p0171 p1101, check your purge valve and watch this ...

P015B - 02 sensor delayed response, lean to rich (bank 1 sensor 1). This is probably the most common one, has appeared multiple times. P0299- Turbo underboost condition (only appeared once) P1101 - Mass Air Flow sensor out of self test range (only appeared once) P0496 - EVAP emission system high purge flow (only appeared once) P2270 - Oxygen ...One of these sensors is the Mass Air Flow sensor (MAF), which monitors the quantity of air entering the engine, and the ECU will illuminate the CEL right away if it detects that the MAF sensor's ...P0301 is a fairly common trouble code with the Chevy Trax. It's an OBD2 code and indicates that your vehicle’s first cylinder is misfiring. P0301 is certainly a cause for concern and should be considered a threat to the drivability of your Trax. ... When your Trax has P0301 and P0171 together, it’s often caused by a clogged or underperforming …How to Replace the Intake Manifold, Valve Cover, and PCV Hose on the GM Ecotec 1.4L Engine: https://youtu.be/OIh3Hr2ybq8In this video I show how to diagnose ...Traxy. OEM isn't Bosch it's ACDelco I believe, but don't quote me on that. P0420 Engine Controls and Fuel Catalyst low efficiency. If it was one of the HO² sensors it would have set a specific code for that particular sensor. P0420 is very hard to diagnose. It could be as simple as a dirty air filter to a bad CAT.P0171 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 1)". 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. Once we are able to …This is a 2015 Chevrolet Trax with 1.4 Turbo engine. P0171 and P1101 sorry on video I said P1107 that was wrong. I put the smoke tester and the breather on t...Mar 3, 2021 · This is a 2015 Chevrolet Trax with 1.4 Turbo engine. P0171 and P1101 sorry on video I said P1107 that was wrong. I put the smoke tester and the breather on t... Chevrolet Cruze 2016 2019 1.4L (RPO LE2) Equinox 2018 2020 1.5L (RPO LYX) Malibu 2016 2020 1.5L (RPO LFV) Trax 2019 2019 1.4L (RPO LE2) Volt 2016 2019 1.5L (RPO L3A) GMC Terrain 2018 2020 1.5L (RPO LYX) Involved Region or Country North America, China, Thailand, GM Korea, Middle East, Israel, Europe, Brazil, Chile, Colombia, Peru, South Africa ... In this video, I show you how I troubleshoot a Check Engine Light (CEL) / Diagnostic Trouble Code (DTC) P0171, System Too Lean Bank 1. The exact vehicle in ...

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If your Chevy Trax is jerking when you press the accelerator, a few common issues can cause this. This guide is built to help you get a better idea as to why your vehicle is jerking. ... P0171 or P0172 (too rich or too lean). There are a ton of 02 sensor codes: A lean or rich air-fuel mixture is usually caused by a bad O2 sensor or MAP/MAF ...P0171 System Too Lean Fix. PCV Hose Replacement 2.0t Cadillac ATS and Chevy Malibu 2013-2020. Diagnosing P0171 System too lean code. How to Remove and Replac...Fuel Injectors. P0171 indicates that your Chevy Trailblazer is either getting too much air or not enough fuel. A clogged or damaged fuel injector will cause the air-fuel mixture to lean out in one specific cylinder. You may see a cylinder misfire code or fuel injector-specific code with P0171.What Does Code P0171 Mean? OBD II fault code P0171 is a generic code that is most commonly defined as “System Too Lean- Bank 1”, and is set on gasoline engines when the PCM (Powertrain Control Module) detects that the air/fuel mixture is too lean. In this context, “lean” refers to a condition where there is too much air relative to fuel ...P0171, according to the manual, is a "Fuel System Lean" diagnostic trouble code. In other words, the engine computer, through the O2 sensor and MAF sensor (mass air flow) adjust your fuel mixture just like a carburetor used to in the "olden days". Causes: MAF sensor. Aftermarket intake or air filter.When it comes to buying a new or used Chevy vehicle, finding a reliable and trustworthy dealership is key. With so many options available, it’s important to know what to look for i...Chevrolet Cruze 2016 2019 1.4L (RPO LE2) Equinox 2018 2020 1.5L (RPO LYX) Malibu 2016 2020 1.5L (RPO LFV) Trax 2019 2019 1.4L (RPO LE2) Volt 2016 2019 1.5L (RPO L3A) GMC Terrain 2018 2020 1.5L (RPO LYX) Involved Region or Country North America, China, Thailand, GM Korea, Middle East, Israel, Europe, Brazil, Chile, Colombia, Peru, South …A friend of mine has a 2013 Chevy Cruze (1.4L) with the following codes: P0171: System Too Lean (Bank 1) P015B: O2 sensor Delayed Response - Lean to Rich Bank 1 Sensor 1. P1101: Intake Air Flow System Performance. P2270: O2 Sensor Signal Stuck Lean - Bank 1\, Sensor 2. I need to ask him what symptoms he is experiencing (I think maybe some rough ...P0171 – Fuel Trim System Lean → Bank 1: P0171 indicates that the side of the engine with the first cylinder (Bank 1) is running lean. P0174- Fuel Trim System Lean → …Jun 23, 2021 · P0171 is one of the hardest codes to solve because so many things can cause a lean condition. From mice nesting in the airbox to multiple sensors being on the border to corroded connectors. Most common is MAF or upstream HO². ….

Descripción del código DTC P0171 CHEVY Chevy. El código P0171 en un modelo chevy indica que el O2 (Oxygen Sensor) situado en el banco 1, ha detectado que existe una condición pobre, es decir que el Sensor de oxigeno (O2) encuentra un exceso de oxígeno en la mezcla aire/combustible. El banco 1 se refiere al lado del motor que tiene el ...28 posts · Joined 2024. #3 · Feb 19, 2024. spark plug wire insulation does not last 10 years without drying/degrading significantly - the sparks may be shorting to block through the old insulation. don't verify it by touching the wire while engine is running. In 100% darkness with hood open and engine running you may be able to see the arcing ...Causes: Common causes include: - Vacuum leaks. - Clogged or faulty Mass Air Flow sensor (MAF) - Faulty PCV valve or other parts of PCV system. - Faulty oxygen sensor. - Stuck open purge valve/solenoid. …Nov 6, 2022 · These are the conditions for the code P0171 to set : * The engine is in Closed Loop status. * The catalyst monitor diagnostic intrusive test, post 02 diagnostic intrusive test, and EVAP diagnostic test are not active. * The engine coolant temperature (ECT) is between -20°C and +150°C (-4°F and +302°F). * The intake air temperature (IAT) is ... Greetings all! My 2015 Chevy Trax has had, at 62,000, the valve cover (pcv valve) replaced as well as the water pump, serpentine belt and belt tensioner replaced, but still has a high pitched whistle in the engine compartment. It has a P0171 code showing on the OBD reader. This whistle begins after the engine is warmed up and only occurs at ...Cómo resolver el código de falla P0171 en Chevy Trax: Guía completa de causas, diagnóstico y reparación. El código de falla P0171 en Chevy Trax puede ser un problema común que enfrentan los propietarios de este vehículo. Este código se refiere a una mezcla de aire y combustible demasiado pobre en el banco 1 del motor. Si no se resuelve ...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 (MAF) Sensor.Dec 13, 2018 · Engine is idling rough & seems to want to stall. CEL came on last Sunday. Ticking noise when running. I had the cruise control on today at 60mph, completely flat road & MPG indicator was erratic - bouncing from 20mpg to 45mpg to 30mpg to 80mpg, etc. AutoZone scan came back with P0171 & P0496. Took it to my usual GM dealer, they want $100 to ... Chevy trax p0171, 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 (MAF) Sensor., Hello this is Mac and I have a 2017 Chevy Trax and I have a P0171-00 Fuel trim system lean. I have about 42psi Fuel pressure at idle going down the road it's about 46-48 up to 58 when excellerating then comes back down would you have any suggestions. Show More. Show Less. Ask Your Own Chevy Question., May 9, 2021 · I have the following codes on my Chevy Cruze. Codes P0507, P1101, P0171, P0106, P015b. I also have a recall on the vehicle and was wondering if the issue with the recall could be causing the codes. Also if the issue with the codes are covered under the powertrain warranty. Any info on the codes or insights to the issue is greatly appreciated. , Aug 19, 2022 ... What Is a Chevy Cruze P0171 OBDII engine code and what are the fixes? Read here for more information: ..., 2016 Chevy Trax - P0171 code. Got it scanned and it says “Bank 1 system too lean” other scanner said “fuel trim system lean”. Went ahead and changed the upstream o2 sensor and the check engine light went away. Drove the car and everything was fine until I put gas in the car and it shook for about 30 seconds after I turned the car back on., P0300 indicates that your Trax’s engine is misfiring, but it can’t detect which cylinder it’s coming from. This code is often thrown when there is a fuel issue, a timing issue, and not just bad ignition components (most likely). Cylinder Specific Misfire. The plug on the left was causing the check engine light to flash and threw a ..., Jan 1, 2019 · P0174 indicates that your Chevy Trax is either getting too much air or not enough fuel. A clogged or damaged fuel injector will cause the air-fuel mixture to lean out in one specific cylinder. You may see a cylinder misfire code or fuel injector-specific code with P0174. It’s unlikely that you’ll see P0171 if this is the case. , #3 · Feb 19, 2024. spark plug wire insulation does not last 10 years without drying/degrading significantly - the sparks may be shorting to block through the old insulation. don't verify …, 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 …, Time saver diag tip po171 ..dealer part only as if 11/30/2018, Customer Complaint: This 2019 Chevrolet Traverse with a 3.6 liter engine came into the shop with a complaint of a check engine light and stalling problem. The customer states that the vehicle will randomly shut off. The codes in this vehicle were: P0171 - Fuel Trim System Lean Bank 1. P0174 - Fuel Trim System Lean Bank 2., Chevy Trax General Discussion Code 84. Jump to Latest ... My actual engine code lights are p0068, p0097, p00f4, p0106, p0113, p0171, p01101, p0102, p2227, p2228. The car only shakes when in idle (park, neutral, drive) but if the car is moving the engine is not shaking. Just replaced my coolant temperature sensor last night and …, P015B - 02 sensor delayed response, lean to rich (bank 1 sensor 1). This is probably the most common one, has appeared multiple times. P0299- Turbo underboost condition (only appeared once) P1101 - Mass Air Flow sensor out of self test range (only appeared once) P0496 - EVAP emission system high purge flow (only appeared once) P2270 - Oxygen ..., If you have a 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, or 2019 Chevy Cruze or Chevy Sonic, and your engine is running rough and you have a check engin..., Aug 19, 2022 ... What Is a Chevy Cruze P0171 OBDII engine code and what are the fixes? Read here for more information: ..., 24 posts · Joined 2015. #1 · Mar 11, 2021 (Edited) I am getting P0131, P0137, and P0171 codes on my 2015 Chevrolet Cruze. Data is as follows: Fuel Sys: CL. Calc Load: 18.4%., The P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air. The first thing I would recommend is reading this article on the P0171 OBD-II trouble code, so you can review ..., If Your Chevy Trax Is Giving You A P0171 Code, It Means That The Engine Is Running Lean. Cruzetalk.com forum, news, discussions and the best community for owners to discuss all things related to the chevy. Web fuel system too lean is the meaning behind the diagnostics trouble code p0171 chevy cruze. P0496 evaporative emission …, Replacing speakers in a vehicle is one of the simplest and most cost-effective ways of improving the sound in your car. The Chevrolet Colorado is a good candidate for speaker repla..., 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 (MAF) Sensor., 28 posts · Joined 2024. #3 · Feb 19, 2024. spark plug wire insulation does not last 10 years without drying/degrading significantly - the sparks may be shorting to block through the old insulation. don't verify it by touching the wire while engine is running. In 100% darkness with hood open and engine running you may be able to see the arcing ..., Anyhow, my wife's 1.4L Ecotec Encore-Trax with 83,000 miles threw a ton of codes last week, P0106, P0171, P1101, P015B and some others, all seemingly relating to a vacuum leak and corresponding lean condition resulting from too much air. Upon inspection, I discovered that had a blown/sucking PCV diaphragm on the cam cover and a missing …, P015B - 02 sensor delayed response, lean to rich (bank 1 sensor 1). This is probably the most common one, has appeared multiple times. P0299- Turbo underboost condition (only appeared once) P1101 - Mass Air Flow sensor out of self test range (only appeared once) P0496 - EVAP emission system high purge flow (only appeared once) P2270 - Oxygen ..., Q: What is P0171 in Chevy Trax and why is it important? A: P0171 is a diagnostic trouble code that indicates a lean mixture condition in the engine of Chevy Trax vehicles. It is important to address this issue as soon as possible to prevent potential damage to the engine and to ensure optimal vehicle performance. , 1. Replace the exhaust front pipe and the warm up three-way catalytic converter. NOTE: A new converter with less than 100mi on it may set the P0420 DTC due to outgassing of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition.", P0171 System Too Lean Fix. PCV Hose Replacement 2.0t Cadillac ATS and Chevy Malibu 2013-2020. Diagnosing P0171 System too lean code. How to Remove and Replac..., These are the conditions for the code P0171 to set : * The engine is in Closed Loop status. * The catalyst monitor diagnostic intrusive test, post 02 diagnostic intrusive test, and EVAP diagnostic test are not active. * The engine coolant temperature (ECT) is between -20°C and +150°C (-4°F and +302°F). * The intake air temperature (IAT) is ..., A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry., CODE P0171 EXPLAINED ON CHEVY, CHEVROLET, GMC, BUICK, CADILLAC ENGINE LIGHT ON Great Car Scanner: https://amzn.to/2QmNBri Check out our Amazon Store for t... , Q: What is P0171 in Chevy Trax and why is it important? A: P0171 is a diagnostic trouble code that indicates a lean mixture condition in the engine of Chevy Trax vehicles. It is important to address this issue as soon as possible to prevent potential damage to the engine and to ensure optimal vehicle performance. , Q: What is P0171 in Chevy Trax and why is it important? A: P0171 is a diagnostic trouble code that indicates a lean mixture condition in the engine of Chevy Trax vehicles. It is important to address this issue as soon as possible to prevent potential damage to the engine and to ensure optimal vehicle performance., One of the most commonly reported issues for the Trax is fault code P0171. This code indicates that the engine is running too lean. This can be a tough code to fix because pinpointing the cause is notoriously difficult. Unfortunately, owners have not reported a common cause for the Trax, meaning it can be almost anything that affects the air ..., Feb 27, 2023 · The P0171 code is triggered when the air-to-fuel ratio of your vehicle is too lean. The PCM receives signals from the oxygen sensors in your engine bay and adjusts the air and fuel mix accordingly. The P0171 code is usually accompanied by the P0170 code as this simply states that a fuel trim anomaly has been detected.