On a Chevy Cruze, diagnostic trouble code P0171 means “Fuel Trim System Lean.” It describes a lean-running condition; it does not identify a specific failed part. GM service bulletins point to different possible faults on different Cruze engines and generations, so identify the car’s year, engine, generation, and region before deciding what to inspect or replace.
What P0171 means on a Chevy Cruze
P0171 is GM’s label for “Fuel Trim System Lean.” In practical terms, the code reports that the engine’s fuel-trim system has detected a lean condition. The code alone cannot tell you whether the cause is in the PCV system, the air-cleaner assembly, or another part of the vehicle.
As an Amazon Associate I earn from qualifying purchases.
The GM bulletins discussed below cover specific engine and model-year combinations. They are not a complete diagnostic procedure for every Cruze, and they do not establish that one cause is the most common. Use the correct vehicle’s current service information and confirm the fault before purchasing parts.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteFirst identify which Cruze you have
“Cruze” and “2016” are not enough to select a diagnostic path. Record the model year, VIN, engine code, generation, and region. Also note all stored and pending codes and the symptoms. A repair bulletin for a first-generation 1.4L engine does not automatically apply to a second-generation 1.4L LE2.
#1 Best Overall
- 【Direct Fit】234-4528 234-4529 Upstream Downstream Oxygen O2 Sensor Compatible with Chevrolet Cruze 2011-2015 1.4L L4, for Chevrolet Sonic 2012-2020 1.4L L4, for Chevrolet Trax 2012-2020 1.4L L4.
- 【Part Number】The Upstream Downstream O2 Sensor Set of 2 Replace OE 234-4528 234-4529.
- 【High Performance】Our 234-4528 234-4529 Oxygen Sensors Features double protection layer, aluminum oxide trap layer, PTFE filter, and stainless steel housing. Reduce harmful emissions, increase fuel economy, improve engine performance, and prevent premature failure of the catalytic converter.
- 【Durable】O2 Oxygen Sensor is crafted from high-temperature resistant material for quicker response times. Manufactured to meet original specification, direct fit without any modification.
- 【Attentions】234-4528 234-4529 Upstream & Downstream O2 Sensor Buy with confidence, Please confirm repeatedly whether your car model is compatible with this product, especially the connector, please carefully check whether the original car connector is consistent with this product. Our products undergo strict quality inspection before leaving the factory, If the O2 Oxygen Sensor has any problems, simply contact us, we will reply you as soon as possible.
| Configuration | GM-documented possibility | What to focus on |
|---|---|---|
| North American 2011–2016 Cruze, 1.4L LUJ, LUU, or LUV | A torn PCV crankcase pressure-control diaphragm may allow unmetered air into the crankcase, according to GM bulletin 19-NA-114 (May 2019). | Confirm PCV valve performance before replacing the camshaft cover. GM bulletin 19-NA-114 (PDF). |
| 2011–2012 Cruze, 1.4L LUJ | A PCV vacuum leak in the camshaft cover may be associated with whistle noise, rough running, and/or P0171, according to GM preliminary information PI0850A (October 2015). | Check current service guidance, including the latest PIP5197, before proceeding. GM PI0850A (PDF). |
| 2016–2019 second-generation Cruze, VIN B, 1.4L LE2, in North America, Australia, or New Zealand | An air-cleaner element bracket that is not properly installed on its mount may warp over time and cause listed airflow-related codes, including P0171, according to GM bulletin 18-NA-118 (September 2020). | Inspect the bracket-to-mount connection if this configuration applies. GM bulletin 18-NA-118 (PDF). |
How to narrow down the cause
1. Record the vehicle and code details
Write down the model year, VIN, engine code, generation, and region, along with every stored and pending trouble code and the symptoms. This helps prevent applying a bulletin to a Cruze with a different engine or PCV arrangement.
2. Match the vehicle to applicable GM guidance
For a North American 2011–2016 1.4L LUJ, LUU, or LUV, GM bulletin 19-NA-114 describes a possible torn PCV diaphragm. For a 2011–2012 1.4L LUJ, PI0850A discusses a camshaft-cover PCV vacuum leak and instructs technicians to check the latest PIP5197. For a 2016–2019 second-generation VIN B 1.4L LE2 in the regions listed above, 18-NA-118 points to the air-cleaner element bracket and mount. Confirm applicability by VIN and current service information.
Rank #2
- Compatible with Chevy Cruze 2011-2016 Chevy Sonic 2012-2020 Chevy Trax 1.4L L4 2013-2020 Buick Encore 1.4L L4 2013-2021
- Replacement Part Number:234-4529 2344529 55569903 55572993 ,234-4528 2344528 55572216 55574136
- High-quality:This product has quality inspection before leaving the factory，Direct replacement:It is installed directly,save your time straightly! No need to modify your car,very convenience
- Upgrade Materials:Using high-quality metal and ceramic components, it can withstand extreme high temperatures and pressures, and is durable and long-lasting
- Offer service:1 years quality support for this!
3. Confirm the suspected component before replacing it
GM’s 19-NA-114 specifically says PCV valve performance must be confirmed before replacing the camshaft cover. A P0171 code by itself is not that confirmation. If the applicable bulletin does not fit the car, or the described condition is not found, continue diagnosis using service information for that exact vehicle rather than assuming the same fault.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
A code reader can show codes and may provide live data, but the cited bulletins do not establish that an inexpensive reader alone can diagnose the root cause. Likewise, these documents do not supply a universal DIY repair sequence, torque specifications, or a complete list of causes for every Cruze.
Quick Recap
Best Value
- Application: Oxygen Sensor Upstream Downstream Replacement for Chevy Cruze 1.4L L4 2011-2015, for Chevy Cruze Limited 1.4L L4 2016, for Chevy Trax 1.4L L4 2015-2021, for Chevy Sonic 1.4L L4 2012 2013 2017-2020, for Buick Encore 1.4L L4 2013-2021
- Replacement Part No: Oxygen Sensor Replace 213-4764 2134764 55569903 55572993 55563348 93174519. Before purchasing an oxygen sensor, please carefully check your vehicle's year, brand and model, image, and part number to confirm compatibility
- Replacement Part No: Oxygen Sensor Replace 213-4764 2134764 55569903 55572993 55563348 93174519. Before purchasing an oxygen sensor, please carefully check your vehicle's year, brand and model, image, and part number to confirm compatibility
- Role of the Oxygen Sensor: Oxygen sensors are critical components in maintaining the health and performance of your vehicle's engine can accurately detect and help ensure continuous monitoring and operation of your engine. O2 sensors solve the problems of unstable idle, frequent stalling, and poor acceleration in your car
- Efficieent Problem Solving: If you encounter any dissatisfaction with the performance of your oxygen sensors, we are committed to providing prompt assistance. Simply send us an email detailing the issue, and our dedicated team will work diligently to resolve your concerns. Whether it involves oxygen sensor replacement, or troubleshooting, we prioritize your satisfaction and aim to ensure your o2 sensor functions as expected
Rank #4
- 🚗【Wide Compatibility】Compatible with Chevrolet Model: 2011-2015 Chevy Cruze 1.8L, 2016 Chevy Cruze Limited 1.8L, 2012-2018 Chevy Sonic 1.8L.(Please browse the product description to confirm model year before purchasing)
- 🚗【Replace Part Number】The O2 Sensor Replacement for OE Number: Replace 250-24648, 234-4527, 55568696, 55572215, 250-24612, 234-4821, 24402859, 24402860.
- 🚗【Drive Farther, Spend Less】 Enjoy more miles per gallon and fewer stops at the pump! Smart sensing technology maximizes fuel efficiency and helps you save money with every drive.
- 🚗【Built to Endure, Designed to Perform】 Crafted with premium platinum and ceramic components to withstand extreme heat and pressure — ensuring long-lasting performance and peace of mind.
- 🚗【Instant Response, Smoother Ride】 Experience faster acceleration and cleaner emissions. Our sensor delivers real-time data to your engine for a smoother, more responsive ride every time you hit the road.
Rank #3
- 【2 PCS】Including 2 Oxygen Sensors Upstream & Downstream:234-4529*1, 234-4528*1
- 【OEM PART NUMBER】234-4529 2344529 55569903 55572993 234-4528 2344528 55572216 55574136
- 【FITMENT】Compatible with 2013 - 2021 Buick Encore 1.4L, 2011 - 2015 Chevy Cruze 1.4L Eco / LT /LTZ, 2016 Chevy Cruze Limited 1.4L Eco / LT /LTZ, 2012 - 2020 Chevy Sonic 1.4L, 2013 - 2021 Chevy Trax 1.4L
- 【PREMIUM PERFORMANCE】Double laser-welded stainless steel body with advanced technology provides high-precision measurement of oxygen partial pressure, precise control of air-fuel ratio and optimized engine performance.
- 【WARRANTY】1 Year.
What the GM bulletins do—and do not—establish
- They document specific possible causes for defined Cruze engines, years, and regions; they do not prove that any particular car has that fault.
- They do not establish a failure rate, repair cost, or that a PCV diaphragm is the “most common” cause of P0171.
- They do not support replacing a camshaft cover, PCV component, or air-cleaner assembly on every Cruze that sets the code.
- PI0850A is preliminary information dated October 2015 and says to check the latest PIP5197. Bulletin 19-NA-114, dated May 2019, replaces PIP5197M.
- Any warranty or special-coverage eligibility depends on the vehicle and is not established by these bulletins; ask Chevrolet or an authorized dealer to check by VIN.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
