Sep 28, 2023 · The P0172 code appears when the ECU detects insufficient fuel in the combustion mix. Several symptoms will point that there is a problem with a too-rich mix condition in your engine: Check engine light is on. Fuel consumption is increased. Black smoke coming from the exhaust. The strong smell of fuel from the exhaust. It is also one of the most common codes. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. Definition. P0171: Fuel Trim System Lean (Bank 1). Symptoms. Check engine light, decreased fuel economy, misfire, hard to find idle. Common Causes.On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses ...Aug 6, 2013 ... Just took my 1997 Tahoe in to read the codes and I got P0172 ... I have P0172, P0175, and P0300 codes. Thread ... 07+ Brake upgrade on a 00-06 NBS, ...Fuel System Too Rich. P0172 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.The fault code P219A indicates a problem with the fuel mixture in the engine. This can cause the engine light to turn on or a service engine soon warning light to appear. One of the most common symptoms of this fault code is excessive fuel consumption. This means that the vehicle may not be as fuel-efficient as it should be, resulting in higher ...May 29, 2022 · The P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is …The P0172 code appears when the ECU detects insufficient fuel in the combustion mix. Several symptoms will point that there is a problem with a too-rich mix condition in your engine: Check engine light is on. Fuel consumption is increased. Black smoke coming from the exhaust. The strong smell of fuel from the exhaust.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. Also shown, a 20...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.This article explains the P0172 code symptoms, causes, and fixing cost. P0172 Code Definition. The P0172 code stands for “Fuel System Too Rich (Bank 1)”. Bank 1 represents the side of the engine that contains cylinder no. 1. The O2 sensor measures the amount of air in the exhaust gases that are in the engine cylinder. What Does the P0172 ...P0191 is a common OBD-II code. It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range. This is a generic code, which indicates that it has the same meaning for the GMC Terrain as it would any other vehicle. P0191 is typically caused by a bad fuel pressure sensor, fuel pressure regulator, or an ...P0175 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.This article explains the P0172 code symptoms, causes, and fixing cost. P0172 Code Definition. The P0172 code stands for “Fuel System Too Rich (Bank 1)”. Bank 1 represents the side of the engine that contains cylinder no. 1. The O2 sensor measures the amount of air in the exhaust gases that are in the engine cylinder. What Does the P0172 ...3 days ago · The P0172 means too much fuel is entering the combustion chamber. So, one of the obvious symptoms is a high fuel consumption rate. This means constant visits to gas stations and extra bucks. Rough idling. …Fuel System Too Rich. P0172 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.This 2013 Chevy Impala has some rough idle problems when hot, and is setting the Fuel System Rich codes P0172 and P0175. 120k miles on the clock.The engine o...This video will list most of the symptoms you may notice with this code and the common cause and repairs perform when this code shows up.Please check out my ...Your fuel system can be a major source of issues. A failed fuel pressure sensor, pump, or clogged fuel filter can cause the P0171 trouble code. Anything that restricts the fuel pressure, or causes an obstruction within the system will prevent the engine from getting the fuel it needs . Vacuum Leak.On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses ...Blasirl. 15883 posts · Joined 2015. #2 · Feb 18, 2020. Welcome Aboard! 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 …Code P0300 is often related to bad spark plugs or spark plug wires but could be caused by a number of issues relating to ignition and the air-to-fuel ratio in the cylinders. When the air/fuel mixture in your cylinder (s) is not able to burn normally and the difference is severe enough, it may cause a misfiring cylinder problem in your vehicle ...P1101 is most commonly a clogged pcv orifice underneath the valve cover in my experience. I see orifice issues at a rate of 5:1 compared to other causes of the DTC. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.Fuel System Too Rich. P0172 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.The method to fix P0172 varies depending on the underlying cause. Here are some potential fixes: Replace a faulty O2 sensor. Clean or replace the MAF sensor. Clean or replace the fuel injectors. Replace the fuel filter or fuel pressure regulator. Repair any vacuum leaks in the engine. Replace a failed fuel pump.This article explains the P0172 code symptoms, causes, and fixing cost. P0172 Code Definition. The P0172 code stands for “Fuel System Too Rich (Bank 1)”. Bank 1 represents the side of the engine that contains cylinder no. 1. The O2 sensor measures the amount of air in the exhaust gases that are in the engine cylinder. What Does the P0172 ...Engine light P0172-Fuel trim system rich (bank1) I removed my cold intake and installed back the stock. Seems new impalas aren't made for high air flow. I erased the code than 5 days later pops up again. So, went back and saw the MAF connector was lose, but if the connector was lose or a hose, the codes should start from P0101-P0103, why …Sep 22, 2016 · In this video we discuss the most common cause of a GMC or Chevy flex fuel equipped vehicle with a check engine light illuminated and a stored code P0172. Th... The P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is highly likely that the problem is caused by leaking fuel injectors. If there are no leaking fuel injectors, the next step is to replace the air filter and clean the Mass Air Flow (MAF ...16 hours ago · 大麻取締法違反の罪に問われたレゲエ・ミュージシャンの米田洪二被告（39）の判決公判が15日、名古屋地裁岡崎支部であった。伊藤昌代裁判官は ...P0172 System Too Rich Bank 1. The P0172 Chevy code can be caused by a leaking fuel injector in the engine’s intake side. Excess fuel will go into the cylinders altering the air-fuel mixture. The oxygen sensor detects the rich condition in the cylinder, and the ECU sends the P0172 code. The P0172 code is a generic OBD-II trouble code and is ...Common Reason: Code P0174 is often related to a vacuum leak. Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0174 is triggered.Cross reference GM parts numbers by entering the part number and selecting the make of the car on the Part Number Search page on GMPartsOnline.net. The site cross references the su...P1101 is most commonly a clogged pcv orifice underneath the valve cover in my experience. I see orifice issues at a rate of 5:1 compared to other causes of the DTC. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread. The P0172 trouble code is set when excess gasoline is in the air-fuel mixture. Learn how to diagnose and fix the P0172 code with YourMechanic today. It is also one of the most common codes. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. Definition. P0171: Fuel Trim System Lean (Bank 1). Symptoms. Check engine light, decreased fuel economy, misfire, hard to find idle. Common Causes.GM is launching its own OnStar Insurance based on telematics and available to drivers of all brands of car. By clicking "TRY IT", I agree to receive newsletters and promotions from...P0172 is a diagnostic trouble code (DTC) that indicates a fuel system rich condition in the Chevy Equinox. The code is triggered when the powertrain control module (PCM) detects a fuel-to-air ratio that is too rich for efficient engine operation. This condition can be caused by a variety of factors, and it is important to identify and repair ...The trouble code “P0172 system too rich” means there is too little oxygen in the exhaust. This error code is triggered by an oxygen sensor in bank one, the side of the engine with ...• P0172: Fuel System Rich • P026D: Injection Quantity Too High • P0300: Engine Misfire Detected • P2A00: HO2S Performance Sensor 1 Correction If you encounter such a situation,DO NOTreplace the fuel system as described in Service Bulletin #16-NA-102. Please perform the following fuel system flushing procedure prior to performing furtherMay 29, 2022 · The P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is …3 days ago · The P0172 means too much fuel is entering the combustion chamber. So, one of the obvious symptoms is a high fuel consumption rate. This means constant visits to gas stations and extra bucks. Rough idling. …P0172 System Too Rich Bank 1. The P0172 Chevy code can be caused by a leaking fuel injector in the engine’s intake side. Excess fuel will go into the cylinders altering the air-fuel mixture. The oxygen sensor detects the rich condition in the cylinder, and the ECU sends the P0172 code. The P0172 code is a generic OBD-II trouble code and is ...This particular Cruze is a 2012 1.4 Turbo but this procedure is very similar to allot of Chevy ans other years Cruze's.Recently I had been felling the car ru...P0175 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.The fuel rail pressure sensor keeps the powertrain control module (PCM) aware of the pressure levels in the fuel rail, so that the computer knows how much fuel the engine needs. When the PCM receives an irrational signal from the fuel rail pressure sensor, the module logs the P0191 code. What Does the P0191 Code Mean?It is also one of the most common codes. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. Definition. P0171: Fuel Trim System Lean (Bank 1). Symptoms. Check engine light, decreased fuel economy, misfire, hard to find idle. Common Causes.Mar 13, 2024 · The P0172 code is indicative of a System Too Rich (Bank 1) condition in the engine’s air-fuel mixture ratio. It signals that the Powertrain Control Module (PCM) has …Jul 14, 2018 · It indicates that your Chevy Cruze is running lean on the bank one side. It’s the most common air/fuel mixture-related code. It’s not the most complicated OBDII trouble code to diagnose. It is also one of the most common codes. The most common causes of P0171 are the purge valve or a vacuum leak. Definition. P0171: Fuel Trim System Lean ... Opel/VauxhallCorsa-E1.4Engine code: LDD/D14XELEngine code: LDD/B14XEL(X15)66 kW (90hp) 6000 rpmR-Cat (2018-2020)Part no 55566514P0171 System too lean bank 1 ...GM has a fix for a P0172 trouble code and fuel in oil, rough idle, and engine run-on. GM has issued a service bulletin #PIP4783B to address a P0172 trouble code and fuel in oil, rough idle, and engine run-on the GM vehicles listed below. Before you perform any diagnostic tests, pull the engine oil dipstick, and check for the presence of fuel.How to Fix Code P0171. Addressing code P0171 is crucial to maintain your vehicle's performance and fuel efficiency. While some causes may require professional attention, there are steps you can take to diagnose and potentially resolve the issue on your own: 1. Check for Vacuum Leaks:Greetings viewers. In this video I dove into a 2014 Chevy Express with the 5.3L engine having a check engine light illuminated and stored codes P0172 and P01...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,...The OBDII trouble code P0172 - System Too Rich (Bank 1) means that the engine air-fuel mixture is too rich, or there is too much fuel and too little air. The code P0175 - System Too Rich (Bank 2) is the same code only for Bank 2 in an engine with two cylinder banks (e;g;, V6 or V8) Symptoms:This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the heated oxygen sensor is shorted to ground if the HO2S voltage is less than 50 mV. P0131 Chevrolet Code - HO2S Circuit Low Voltage Bank 1 Sensor 1.The P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is highly likely that the problem is caused by leaking fuel injectors.Nov 12, 2012 · Failed or Faulty Oxygen Sensor (bank 1, sensor 1) Sticking/Plugged or Failed Fuel Injector. Low Fuel Pressure (possible plugged/dirty fuel filter!) Exhaust Leak between Engine and first Oxygen Sensor. Possible Solutions: A lot of Times, Cleaning the MAF Sensor and Finding/Fixing Vacuum Leaks fixes the Problem. The P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is highly likely that the problem is caused by leaking fuel injectors. If there are no leaking fuel injectors, the next step is to replace the air filter and clean the Mass Air Flow (MAF ...P0172 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.General Motors (GM) is an iconic American automobile manufacturer that has left an indelible mark on the automotive industry. With a history spanning over a century, GM has consist...Gm gmc buick cadillac motors general chevy cycle company drive brand round complete september led global supply resist electric 2017 buick cascada 1.6l turbo P0171 lean too system sensor bank gm fuel troublecodes located where maf 2021 97 buick century 3.1 code p0401 fix ... position actuator for a 2015 buick verano is it the How i …P0172 and P0175. So I recently put in a new thermostat and coolant temp sensor. Afterwards, I figured I'd go ahead and change the engine/cabin filters. I have a scan tool so I ran it, all seemed ok. About 1-2 days later I got the above codes. I looked around and saw the right PVC valve tubing was cracked, so I tracked down a new one and put it …Your fuel system can be a major source of issues. A failed fuel pressure sensor, pump, or clogged fuel filter can cause the P0171 trouble code. Anything that restricts the fuel pressure, or causes an obstruction within the system will prevent the engine from getting the fuel it needs . Vacuum Leak.The P0172 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0172 is set in along with the P0175 code, it is highly likely that the problem is caused by leaking fuel injectors. If there are no leaking fuel injectors, the next step is to replace the air filter and clean the Mass Air Flow (MAF ...... grams per second. Test temperature sensors for accuracy: With the engine cold (preferably after sitting overnight) use a scan tool or a multimeter to monitor ...Diagnostic trouble code P0171 means System Too Lean (bank 1). That means the car computer noticed the engine is running lean. A lean system means the air-fuel ratio entering the combustion chamber is not what the engine wants. It means there is too much air or too little gas to balance the specified mixture ratio.In this video I have a look at a 2008 Chevrolet Silverado 1500 5.3 that came in with codes P0171 and P0174 indicating that the engine is running lean. It doe...P0175 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.Oxygen Sensor. The P0171 code is thrown when the bank one sensor one O2 sensor reports that your Encore’s engine is running lean. The sensor on or right after the exhaust manifold is typically the sensor that reports the lean condition. If it is malfunctioning, it can cause a false P0171 code. Swap Test.Summary. Diagnostic trouble code (DTC) P0172 stands for “Fuel System Too Rich (Bank 1)”. Your car’s computer may set the code when it detects that there is too much fuel or …The OBDII trouble code P0172 - System Too Rich (Bank 1) means that the engine air-fuel mixture is too rich, or there is too much fuel and too little air. The code P0175 - System Too Rich (Bank 2) is the same code only for Bank 2 in an engine with two cylinder banks (e;g;, V6 or V8) Symptoms:Oxygen Sensor. The P0171 code is thrown when the bank one sensor one O2 sensor reports that your Equinox’s engine is running lean. The sensor on or right after the exhaust manifold is typically the sensor that reports the lean condition. If it is malfunctioning, it can cause a false P0171 code. Swap Test.Code P0131 is a result of the oxygen sensor incorrectly detecting the air/fuel ratio of the exhaust. This ratio is sent to the ECM which uses this data, along with comparisons to the outside air, to regulate the air to fuel ratio needed by the engine. This code is the result of this ECM detecting either a voltage outside of the specified range ...Cross reference GM parts numbers by entering the part number and selecting the make of the car on the Part Number Search page on GMPartsOnline.net. The site cross references the su...P0172 GM Service Bulletin #18-NA-246 — TSB Fix P0172 GM Service Bulletin #18-NA-246. GM has issued a service bulletin #18-NA-246 to address a P0172 code on the vehicles listed below. This Bulletin applies to the vehicles that have fuel enriched engine oil due to short driving intervals.P0172 is thrown when the oxygen sensors detect that the air-fuel mixture is too rich. A rich fuel mixture contains too much fuel in relation to air. The A/F ratio for ideal combustion is 14.7 parts air to 1 part fuel (14.7:1). With that in mind, either too much fuel or not enough air can cause a vehicle to run rich.The P0172 code stands for “Fuel System Too Rich (Bank 1)”. What this means in plain language is that there’s too much fuel being delivered to combustion chambers on bank 1, or not enough air. A car engine requires a 14.7:1 air to fuel ratio to work optimally. There are sensors that monitor the amount of air coming in, and the ECU …The ad agency business has gone through many changes in the last 20 years. The internet and the growth of social media have made dramatic differences to the way in which consumers ...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 ...The trouble code “P0172 system too rich” means there is too little oxygen in the exhaust. This error code is triggered by an oxygen sensor in bank one, the side of the engine with ...GM provides two separate discounts to the family members and friends of GM employees. To receive the Family First discount, a purchaser must be a family member of a GM employee. Em...The Stabilitrac light came on briefly and then the Check Engine Light came on shortly after. I went up to Advance Auto and read the code and it posted a P0172. Reading the code turned off the light. A quick scan of this forum yielded a few hits about MAFs and oiled filters, which the original owner installed.May 24, 2023 · If your Chevy has a P0172 code, it can indicate a rich fuel mixture in one of the engine cylinders. Several possible causes for this issue include a faulty oxygen …Sep 27, 2023 · How to Fix Code P0171. Addressing code P0171 is crucial to maintain your vehicle's performance and fuel efficiency. While some causes may require professional attention, there are steps you can take to diagnose and potentially resolve the issue on your own: 1. Check for Vacuum Leaks:
Indicator Lamp (MIL) Illuminated - DTCs P0300-P0308, P050D, P0171, P0172, P0174, P0175, P2099, P219A, and/or P219B Set Attention: This bulletin applies to V6 and V8 Gasoline Engines ONLY. Brand: Model: Model Year: VIN: Engine: Transmission: ... GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They …. Gas station sells kerosene near me
In this video I have a look at a 2008 Chevrolet Silverado 1500 5.3 that came in with codes P0171 and P0174 indicating that the engine is running lean. It doe...Oct 21, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈==== How to Fix P0172 =====Engine Code P0172 Saving Repair P... Diagnostic trouble code (DTC) P0172 stands for “Fuel System Too Rich (Bank 1)”. Your car’s computer may set the code when it detects that there is too much fuel or not enough oxygen in the engine. There are numerous methods for resolving code P0172, however the actual cause must be determined. The ad agency business has gone through many changes in the last 20 years. The internet and the growth of social media have made dramatic differences to the way in which consumers ...Engine-Codes.comGm’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, ...The fault code P219A indicates a problem with the fuel mixture in the engine. This can cause the engine light to turn on or a service engine soon warning light to appear. One of the most common symptoms of this fault code is excessive fuel consumption. This means that the vehicle may not be as fuel-efficient as it should be, resulting in higher ...Jun 30, 2022 · Diagnostic trouble code P0171 means System Too Lean (bank 1). That means the car computer noticed the engine is running lean. A lean system means the air-fuel ratio entering the combustion chamber is not what the engine wants. It means there is too much air or too little gas to balance the specified mixture ratio. Nov 12, 2012 · Failed or Faulty Oxygen Sensor (bank 1, sensor 1) Sticking/Plugged or Failed Fuel Injector. Low Fuel Pressure (possible plugged/dirty fuel filter!) Exhaust Leak between Engine and first Oxygen Sensor. Possible Solutions: A lot of Times, Cleaning the MAF Sensor and Finding/Fixing Vacuum Leaks fixes the Problem. Bank 2: A P0174 DTC tells you that bank 2 is the one having the issue. Bank 2 is the engine bank that holds the spark plugs for cylinders 2, 4, and 6 (V6 4.3L). Cylinders 2, 4, 6 and 8 (V8 5.0L, 5.7L). This bank is the one on the passenger side of the engine. The main sensors responsible for telling the PCM that there's a problem with the air ...Summary. Diagnostic trouble code (DTC) P0172 stands for “Fuel System Too Rich (Bank 1)”. Your car’s computer may set the code when it detects that there is too much fuel or …To diagnose the P0172 Chevrolet 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.How to Fix Code P0171. Addressing code P0171 is crucial to maintain your vehicle's performance and fuel efficiency. While some causes may require professional attention, there are steps you can take to diagnose and potentially resolve the issue on your own: 1. Check for Vacuum Leaks:Start by taking a look at the vacuum lines and seeing if you have a leak. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. Definition. P0171: Fuel Trim System Lean (Bank 1). Symptoms. Check engine light, decreased fuel economy, misfire, hard to find idle. Common Causes.Your fuel system can be a major source of issues. A failed fuel pressure sensor, pump, or clogged fuel filter can cause the P0171 trouble code. Anything that restricts the fuel pressure, or causes an obstruction within the system will prevent the engine from getting the fuel it needs . Vacuum Leak.Jul 23, 2018 · Start by taking a look at the vacuum lines and seeing if you have a leak. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. Definition. P0171: Fuel Trim System Lean (Bank 1). Symptoms. Check engine light, decreased fuel economy, misfire, hard to find idle. Common Causes. The automobile fault code P2068 can be caused by a faulty fuel level sensor. It can also be caused by an open or shorted fuel level sensor harness. Poor electrical connection in the fuel level sensor circuit can also trigger this fault code. A faulty instrument cluster can also be a cause of P2068. Lastly, a faulty engine control module (ECM ...The trouble code “P0172 system too rich” means there is too little oxygen in the exhaust. This error code is triggered by an oxygen sensor in bank one, the side of the engine with ...Conclusion. If your Chevy has a P0172 code, it can indicate a rich fuel mixture in one of the engine cylinders. Several possible causes for this issue include a faulty oxygen sensor, malfunctioning MAF sensor, clogged fuel injector, vacuum leak in the intake system, and faulty fuel pressure regulator..