P0420 code buick encore - Norwegian has no new vessels on order in the size range of Norwegian Encore, which ranks among the top 10 biggest passenger ships ever built. Instead, the 17-ship cruise operator i...

 
Jan 12, 2023 · I have a 2014 Buick Encore with 68,500 miles on it. I brought it back to the Buick dealership I bought it from with the check engine light on it. It came up P0420 code. They told me everything was cov … read more . 2021 toyota highlander xle towing capacity

Subject: Malfunction Indicator Lamp (MIL) Illuminated, DTC P0420 Set This bulletin replaces 18-NA-331. Please discard 18-NA-331. Brand: Model: Model Year: VIN: Engine: …Mar 29, 2019 · Buick Mechanic: john aka eauto. 1. Check for air/vacuum leaks. 2. With engine at operating temperature, check throttle angle. 3. The throttle angle should be 8-12% with engine at operating temperature and A/C OFF. 4. If the throttle angle is lower than 8%, suspect an air/vacuum leak. August 16, 2022 by DTR Staff. P0324 is a common OBD2 trouble code. It indicates that there is an issue with your Buick Encore’s knock control system. While P0324 is a generic code, repair steps will vary depending on your Encore’s engine type and model year. However, some basic steps can be followed to help diagnose and fix the problem.Catalytic converter replacement. How to replace a catalytic converter DIY with Scotty Kilmer. Catalytic converter replacement in your car (Code P0420). Tips ...The OBD2 Code Information Be Applicable For Buick. 2013 Buick Verano Turbo,2013 Buick Riviera Concept,2013 Buick Encore,2013 Buick Enclave,2012 Buick Verano,2012 Buick Regal GS,2011 Buick Regal,2011 Buick LaCrosse GL Concept,2011 Buick GL8,2011 Buick Envision Concept,2010 Buick Regal GS Concept,2010 Buick LaCrosse,2009 Buick Business Concept,2008 Buick Lucerne Super,2008 Buick LaCrosse Super ...Engine oil level/pressure, mechanical fault. P1014. Exhaust Camshaft Position Actuator Park Position Bank 2. P1031. HO2S Heater Current Monitor Control Circuit Banks 1 and 2 Sensor 1. P1032. HO2S Heater Warm Up Control Circuit Banks 1 and 2 Sensor 1. P1100 – P1199 (Fuel and air metering) P1101.Decoding the P0420 Code: Bank 1 Catalyst System Efficiency Below Threshold. The catalyst system efficiency below threshold is tech speak for "Hey buddy, your catalytic converter is slacking on cleaning duty." This troublemaker of a code pops up when your car's brain (aka your cars computer system) senses that the cat isn't filtering …Labor: 1.0. To diagnose the C0561 Buick 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 diagnose code P0171 on a Buick Encore: First, check for other trouble codes with an OBD scanner like this one from BlueDriver. This will help you ensure you've got a full picture of the issues you're facing from P0171 and other codes before you proceed. Once you've confirmed that P0171 is present & you're aware of any other issues ... Exhaust leak. 1. Faulty Catalytic Converter. A P0420 code will most likely appear if your catalytic converter is malfunctioning. This is the case because the converter is in charge of converting toxic emissions into less harmful gases. As a result, if it's damaged, it might create a slew of problems with your vehicle. How to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av...#p0420 #p0430 #catalyticconvertercodes #badcat #autel #motoragetrainingThe “Catalytic Converter Efficiency” codes, P0420 and P0430, are among the top 10 DTCs...Common Reason: Code P0420 is often related to a bad catalytic converter. P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Your car won’t pass an emissions test. A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components.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.Nov 3, 2018 · Clean the Mass Air Flow (MAF) Sensor: A dirty MAF sensor can cause the P0102 code to appear. You can clean the sensor with low compressed air or MAF sensor cleaner. Be sure to follow the manufacturer’s instructions carefully. Replace the Air Filter: A clogged or dirty air filter can also cause the P0102 code. Whether you just want to be able to hack a few scripts or make a feature-rich application, writing code can be a little overwhelming with the massive amount of information availabl...Warranty coverage (Code E), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation Vehicle Description Labor Time 4087348* All Crankcase Pressure Test 0.3 hr Add Encore Camshaft Cover Inspection, Cleaning and Orifice Replacement 2.0 hrs Add ... Search Buick Encore Codes. ... P0420. Catalyst System Efficiency Below Threshold (Bank 1) Learn More Fixes. 3/10 P0442. Evaporative Emission Control System Leak Detected. P0420 Code. How to fix it. Don't spent tons of $$$. ~This also true for the po430 Code!Check out My Amazon Auto Accessories Store! Lets make that Weekend job...P0420 Code - Catalyst System Efficiency Below Threshold Bank 1. How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. ... P0420 Buick Catalyst System Low Efficiency Bank 1 ...CHECK ENGINE LIGHT, Auto zone gave me a code of P0420. Stays on. 2013 Buick Encore. I changed the O2 sensor. It came on - Answered by a verified Buick MechanicHow to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av... Exhaust leak. 1. Faulty Catalytic Converter. A P0420 code will most likely appear if your catalytic converter is malfunctioning. This is the case because the converter is in charge of converting toxic emissions into less harmful gases. As a result, if it's damaged, it might create a slew of problems with your vehicle. Jay Safford. Automotive Mechanic. 16 years of experience. The code P0420 can be caused by the catalyst, O2 sensors before and after the catalyst. If both O2 sensors and catalyst was replaced then you may have an exhaust leak at the manifold or pipes. I suggest you have a mechanic like one from YourMechanic do a complete diagnostics of …Oxygen sensors are only a part of a greater system, meaning if the p0420 code (or p0141, or p0135) is thrown, that doesn’t necessarily indicate the oxygen sensors need replacement. Rather, there could be something else in that system does that’s causing the oxygen sensors to appear faulty. This is actually the case with most check engine codes.Oct 7, 2020 · Oil pressure builds up and blows back through the oil cap. I have had the valve gasket replaced the turbo charger replaced and the catalytic …. J Hall. retired. none. 2,563 satisfied customers. CHECK ENGINE LIGHT, Auto zone gave me a code of P0420. Stays. Jul 7, 2020 · Oxygen sensors are only a part of a greater system, meaning if the p0420 code (or p0141, or p0135) is thrown, that doesn’t necessarily indicate the oxygen sensors need replacement. Rather, there could be something else in that system does that’s causing the oxygen sensors to appear faulty. This is actually the case with most check engine codes. P0402 is a general code, which means that regardless of the year (1996+) and the model, it’ll have the same meaning regardless of which manufacturer built the vehicle (Buick Encore or not). Related: P0420 Buick Encore . Buick Encore P0402 SymptomsIf You're getting fault code P1101 on Your Buick Encore, know that it's not the end of the world -- but it's something that You should get checked out sooner than later. In essence, what it means is that the powertrain control module (PCM) has detected a discrepancy with the MAF sensor voltage. The Encore will run a Key On Engine Running (KOER) test, and if the MAF sensor voltage is out of ...So just to clarify, the p0420 code indicates an issue with the engine misfiring resulting in catalytic converter system errors? Would that be covered by the drivetrain warranty my car is still under? ... Second opinion] My 2018 Buick Encore has a check engine light and a couple codes. 1 is p0171 and the 2nd is u401-71 ...The average cost for a Buick Encore Oxygen Sensor Replacement is between $257 and $305. Labor costs are estimated between $44 and $56 while parts are priced between $213 and $249. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.What causes the P0171 code to appear in a Buick Encore? The P0171 code in a Buick Encore indicates that the engine is running too lean, meaning there is too much air and not enough fuel in the air-fuel mixture. This can cause poor performance, reduced fuel efficiency, and potential engine damage. The possible causes for the P0171 code in a ...The P0420 code in a Buick Encore will often be thrown if one of your vehicle’s oxygen sensors is not functioning correctly. There are rarely drivability issues associated with P0420. For most people, the first sign that anything is wrong is the service engine soon light coming on. Here are the typical … See moreThe P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensor(s) and an increase in switching activity—from rich to lean to rich, etc.—that closely resembles the front Oxygen Sensor(s) during the time the computer is activating the Catalytic Converter monitor test.I don't have a Chevy I have a 2013 Buick encore but have had both codes come up p0301 & P0420, trying to get an idea - Answered by a verified Buick Mechanic ... If the misfire is fixed, clear the codes and drive the vehicle. If the P0420 returns, then unfortunately, the misfire harmed the converter and it will need to be replaced. Ask Your …I replaced turbo and 02 sensor on my 2015 Buick encore. Code 0299 and 0420 still did not go away. A couple of days later replaced catalytic converter and both codes went away. Reply. 1; 2; 3; Next. 1 of 3 Go to page. Go. Next Last. Post reply Insert quotes… Share:Jun 28, 2018 · This code points to a failing Catalytic Converter. The Oxygen Sensors measure the amount of emissions in the exhaust going into, and then out of the converter. When they see that the converter is not "cleaning" the exhaust enough to meet specs, the Converter is deemed "below threshold" and the P0420 is set. The OBD2 Code Information Be Applicable For Buick. 2013 Buick Verano Turbo,2013 Buick Riviera Concept,2013 Buick Encore,2013 Buick Enclave,2012 Buick Verano,2012 Buick Regal GS,2011 Buick Regal,2011 Buick LaCrosse GL Concept,2011 Buick GL8,2011 Buick Envision Concept,2010 Buick Regal GS Concept,2010 Buick LaCrosse,2009 Buick Business Concept,2008 Buick Lucerne Super,2008 Buick LaCrosse Super ... How to diagnose code P0171 on a Buick Encore: First, check for other trouble codes with an OBD scanner like this one from BlueDriver. This will help you ensure you've got a full picture of the issues you're facing from P0171 and other codes before you proceed. Once you've confirmed that P0171 is present & you're aware of any other issues ... How to fix you emissions p0420 code for cheap, easy, fast. Watch this video and learn how to turn off you cars check engine in under 10 minutes with parts av...Repair Information for P0420 Buick code. Learn what Catalyst System Low Efficiency Bank 1 means, location and how to repair? A 3-way catalyst controls …Nov 3, 2018 · Clean the Mass Air Flow (MAF) Sensor: A dirty MAF sensor can cause the P0102 code to appear. You can clean the sensor with low compressed air or MAF sensor cleaner. Be sure to follow the manufacturer’s instructions carefully. Replace the Air Filter: A clogged or dirty air filter can also cause the P0102 code. This page is meant to help you troubleshoot the Buick Lucerne P0420 trouble code. It covers the P0420 code's meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. TableWhat are the Common Symptoms of the P0420 Code? Illuminated check engine light; Failed emissions test; Rotten egg smell from the exhaust pipe; Reduced engine power output; Inability to accelerate; How to Diagnose the P0420 Code. P0420 is a generic powertrain code that various vehicles can log. The process to diagnose might vary depending on ...LaCrosse. 2010 Buick LaCrosse CXL. I have a 2010 Buick... k. kim a Coy Posted on Feb 20, 2015. Answered by a Fixya Expert. I have a 2010 Buick Lacrosse that had the P0420 code. Replaced the Bank One Cat and the code and the check engine light came on again with the same code. Garage cleared it again and now its back on again …How to check for a bad catalytic converter in Buick Encore? Reading out the fault codes using a diagnostic device is relatively reliable. If you see any fault code from P0420 to P0424 or from P0430 to P0434 in the OBD2 scanner, it indicates a problem with the catalytic converter. However, this is not always the case, as a bad oxygen sensor …How to check for a bad catalytic converter in Buick Encore? Reading out the fault codes using a diagnostic device is relatively reliable. If you see any fault code from P0420 to P0424 or from P0430 to P0434 in the OBD2 scanner, it indicates a problem with the catalytic converter.P2099 is a generic OBD II code. It has the same meaning for the Buick Enclave as it would any other vehicle. It specifically indicates that your Enclave detected that air-fuel mixture reading as the exhaust gas exits the catalytic converter on the bank 2 side of the engine is too rich. (too much fuel.Long Island. Buick Ownership. 2002 LeSabre Limited. Had a P0300 yesterday. I checked fuel pressure initially being that I had never even had a single misfire since purchasing the car in October 2020. Pressure was about 44-46 so I proceeded to mist the coils and wires to check for arcing and found nothing.What causes the P0171 code to appear in a Buick Encore? The P0171 code in a Buick Encore indicates that the engine is running too lean, meaning there is too much air and not enough fuel in the air-fuel mixture. This can cause poor performance, reduced fuel efficiency, and potential engine damage. The possible causes for the P0171 code in a ...To diagnose the P0300 Buick 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.Recall date. 2015-03-20. Recall no. 15V162000. General Motors LLC (GM) is recalling certain model year 2015 Buick Encore vehicles manufactured August 26, 2014, to February 9, 2015, and 2015 ...Repair Information for P0420 Buick code. Learn what Catalyst System Low Efficiency Bank 1 means, location and how to repair? A 3-way catalyst controls …Learn the difference between source code and object code within computer programming. Each term has its own use; deciphering them can be difficult at first, but with this easy-to-f...P0301 is a fairly common trouble code with the Buick Encore. 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 Encore. Fixing P0301 should be considered a high priority.Here’s a good P0420 diagnostic order for the Buick LeSabre: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the LeSabre is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your car. Misfire Codes. Exhaust leak. 1. Faulty Catalytic Converter. A P0420 code will most likely appear if your catalytic converter is malfunctioning. This is the case because the converter is in charge of converting toxic emissions into less harmful gases. As a result, if it's damaged, it might create a slew of problems with your vehicle. Jun 15, 2021 · June 16, 2021 by Jason. P2097 is a generic OBD II code, which means that it has the same meaning for the Buick Encore as it would any other vehicle. It specifically indicates that your Encore detected that air-fuel mixture reading as the exhaust gas exits the catalytic converter is too rich. (too much fuel for the amount of fuel present). P0299 set and I performed the diagnosis for the control side, but the issue was worn metal at the waste gate. I guess they never learned a lesson from the tu...Jul 22, 2023. cranking fuel pressure p00c6 p228c reduced engine power rough idle stalling. Replies: 5. Forum: Buick Verano Forum (Excelle) 2005 Park Avenue non-Turbo stalling randomly with RPM surge. No check engine light nor engine codes... Hello, I've owned my Park Avenue for about five years, and it's been driving smoothly until recently.Jun 29, 2015 · I replaced turbo and 02 sensor on my 2015 Buick encore. Code 0299 and 0420 still did not go away. A couple of days later replaced catalytic converter and both codes ... Related Codes. P0420 Buick P0422 Buick P0423 Buick P0424 Buick P0425 Buick P0426 Buick P0427 Buick P0428 Buick P0429 Buick ... 2013 Buick Verano Turbo,2013 Buick Riviera Concept,2013 Buick Encore,2013 Buick Enclave,2012 Buick Verano,2012 Buick Regal GS,2011 Buick Regal,2011 Buick LaCrosse GL Concept,2011 Buick …Jul 22, 2023. cranking fuel pressure p00c6 p228c reduced engine power rough idle stalling. Replies: 5. Forum: Buick Verano Forum (Excelle) 2005 Park Avenue non-Turbo stalling randomly with RPM surge. No check engine light nor engine codes... Hello, I've owned my Park Avenue for about five years, and it's been driving smoothly until recently.Find your TRQ parts here: http://1aau.to/m/ETCG0420Eric the Car Guy is here! He's visiting TRQ to explain check engine codes to you! In this video, Eric the ...This page is meant to help you troubleshoot the Buick Verano P0420 trouble code. It covers the P0420 code's meaning, symptoms, causes, and possible solutions. P0420 is the most common OBDII code and is virtually never a breakdown risk. A failing oxygen sensor or bad catalytic converter are the most common causes of P0420. TableThe 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 ...Labor: 1.0. To diagnose the C0561 Buick 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: Common solutions for fixing the P0299 code on a Buick Encore include checking all connections and hoses carefully, replacing or cleaning any clogged intake manifold pressure sensors, replacing any faulty turbocharger wastegate solenoid valves and replacing any vacuum lines to the wastegate solenoid valve. In conclusion, the P0299 code on a ...Feb 15, 2020 · WHAT CAUSES CODE P0420 ENGINE LIGHT CHEVROLET, CHEVY, GMC, BUICK, CADILLAC Great Car Scanner: https://amzn.to/2QmNBri Check out our Amazon Store for the to... The 2013 Buick Encore has 1 problems reported for engine light on p0420. Average repair cost is $800 at 76,000 miles. ... Engine Light On P0420. ... Enter your zip code: A free service from ...Jan 16, 2022 ... A friends car had an engine light come on and they wanted my help they hard starting issues every time after filling up. the code reader ...To diagnose the P0300 Buick 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.2013-2017 Buick Encore. 2011-2016 Chevrolet Cruze. 2012-2016 Chevrolet Sonic. 2013-2017 Chevrolet Trax. All equipped with 1.4L engine. Community Repair Questions. P0420 After Cat Replaced. TECH-ASSIST01/03/2018 | 07:28:10. The customer returned after the catalytic converter was replaced and the P0420 reset. The scan tool P0420 - Catalyst System ...I have a 2014 Buick Encore with 68,500 miles on it. I brought it back to the Buick dealership I bought it from with the check engine light on it. It came up P0420 code. They told me everything was cov … read moreBuick Lucerne P0420: Meaning, Causes, + How to Fix. This page is meant to help you troubleshoot the Buick Lucerne P0420 trouble code. It covers the P0420 …The P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensor(s) and an increase in switching activity—from rich to lean to rich, etc.—that closely resembles the front Oxygen Sensor(s) during the time the computer is activating the Catalytic Converter monitor test.This is the Buick ENCORE VIN decoder. Every Buick car has a unique identifier code called a VIN. This number contains vital information about the car, such as its manufacturer, year of production, the plant it was produced in, type of engine, model and more. For instance, if someone wants to buy a car, it is possible to check the VIN one the ...Search Buick Encore Codes. ... P0420. Catalyst System Efficiency Below Threshold (Bank 1) Learn More Fixes. 3/10 P0442. Evaporative Emission Control System Leak Detected.A: Common solutions for fixing the P0299 code on a Buick Encore include checking all connections and hoses carefully, replacing or cleaning any clogged intake manifold pressure sensors, replacing any faulty turbocharger wastegate solenoid valves and replacing any vacuum lines to the wastegate solenoid valve. In conclusion, the P0299 …A very common issue with the Buick Encore is the P0449 code. This trouble code is a reference number that is given to you when you plug your Encore into a OBDII scanner. P0449 deals with the evaporative emissions control system. It often appears with, or is related other codes, such as P0420, P0446, and very often P0440.p1467 code Buick Encore JA: Im sorry to hear that youre experiencing trouble with your Buick Encore, but our Buick Mechanic will be able to help you with the P1467 code. Have you noticed any specific … read more

Buick Mechanic: john aka eauto. 1. Check for air/vacuum leaks. 2. With engine at operating temperature, check throttle angle. 3. The throttle angle should be 8-12% with engine at operating temperature and A/C OFF. 4. If the throttle angle is lower than 8%, suspect an air/vacuum leak.. Menards gravel bags

p0420 code buick encore

1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005Buick LeSabre, Pontiac Bonneville, Oldsmobile Aurora, Buick Riviera, Cadillac Seville and many othe...2013-2017 Buick Encore. 2011-2016 Chevrolet Cruze. 2012-2016 Chevrolet Sonic. 2013-2017 Chevrolet Trax. All equipped with 1.4L engine. Community Repair Questions. P0420 After Cat Replaced. TECH-ASSIST01/03/2018 | 07:28:10. The customer returned after the catalytic converter was replaced and the P0420 reset. The scan tool P0420 - Catalyst System ...Buy JT Exhaust Catalytic Converter Compatible with 2011-2016 Chevrolet Cruze, 2013-2017 Buick Encore, 2012-2016 Chevrolet Sonic 1.4L (EPA Compliant)(Standard EPA Grade): Catalytic Converters - Amazon.com FREE DELIVERY possible on eligible purchasesOwners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782 ...The most common fix for P0420 in the Buick LaCrosse is a new catalytic converter, followed by an O2 sensor replacement. Before taking your LaCrosse into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Buick LaCrosse: 1. Check for Other Codes.Equip cars, trucks & SUVs with 2015 Buick Encore Valve Cover Gasket from AutoZone. Get Yours Today! We have the best products at the right price. ... Use Code: APRILDEAL. Menu. 20% off orders over $100* + Free Ground Shipping** Eligible Ship-To-Home Items Only. Use Code: APRILDEAL. Sign In. Cart. Menu. add vehicle.2014 Buick Encore P0420 code. Hey y’all, I need some help regarding my Buick, about four months ago I got a check engine light for this code and took it to a local shop since I can’t replace a Cat myself, it was replaced and I was told it was fixed and they made sure to use an OEM cat with platinum, not a cheaper replacement cat.The most common signs of bad O2 sensor in Buick Encore are slow acceleration, loss of power, irregular idling, engine hesitation or jerking when accelerating, high fuel consumption, higher tailpipe emissions, foul odor from exhaust, check engine light illuminates, and sometimes stalling.2016 encore put a dorman cat in 2 gm oem 02 sensors,code p0420 still comes up. ... Home › Forum › Buick › 2016 Encore p0420 code. This topic contains 1 reply, has 2 voices, ...2014 Buick Encore 1.4 would a crack in the flex pipe between the converters set a p0420? I've seen more than one of - Answered by a verified Buick Mechanic ... The P0420 code only sets when the ECM sees similar signals from the upstream and downstream sensors, if both of the sensors would be affected by this crack then there …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..

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