No intentionally bad, harmful, or deceptive advice. Memes, youtube videos and other non questions are not allowed Title, salvage, body work, paint work, etc questions also dont belong here. Showing off w/out a question goes in r/justrolledintotheshop legal/insurance questions go in r/legaladvice or r/insurance. If it's got wheels, treads, floats, flies, or has an engine you're good to go and we'll do our best to help. This is a subreddit for asking Mechanical questions pertaining to vehicles, engines, etc. Questions of this nature will be removed RULES Please Take a Moment To Read The Rules Before Postingġ) Advice Format. BELONG in r/Autobody or /r/Diyautobody/ Do not ask for an estimate there as it is against the subs rules. If that isn't available, provide all you know and explain why.Īll bodywork, accident damage, paint, dent/ding questions. If possible posts must include the make/model/year in the title or body of the post. PART TRADING: If you have parts you would like to trade please do so at r/partIt Hopefully this article answers most of your questions.Join the /r/MechanicAdvice IRC for instant conversations with other users on libera.chat irc network. We highly recommend you get this fixed quickly whether you do it or someone else does. Not only that, but even in a really minor case you'll lose out on a lot of engine power & face terrible fuel efficency. It might start with a slight knocking or a little less power when you put your foot down, but it'll turn into needing a new $3000 catalytic converter before you realize it. If you've been driving around with P0171, your engine's going to start having progressively bigger issues. Replace your fuel filter if nothing else is working.Examine your engine for vacuum leaks (again, listening closely while the engine is off).Replace one (or multiple) fuel injectors.What specific repairs are involved in fixing OBD code P0171?Ĭonsider the following fixes depending on what you learned while diagnosing your issue. If you think you've got an issue with your MAF sensor, consider cleaning it with MAF cleaner spray first – it costs $20 and might save you hundreds in parts & labor.It's an easy google search to find the bulletins for your vehicle and they often contain information invaluable to a repair. As always, technical service bulletins are your friend.Things to watch out for when diagnosing & repairing code P0171 on the Chevrolet Trax: If all else fails, you're probably looking at an expensive repair to the PCM (Powertrain Control Module).Replace it as directed by the manufacturer. The root of this trouble code will likely be discovered during those three tests, but if not… The vacuum, fuel pressure, & MAF readings from the engine need to be within the manufacturer specs.If they don't, it's a faulty sensor you're dealing with. You'll want to make sure that the readings from your diagnostic tool line up with the readings from the MAF sensor & fuel pressure sensor. The fuel pressure sensor and MAF sensor (mass air flow) also need to be checked with a fuel pressure gauge set like this one.You'll want to listen for a hissing sound & trace it back as best you can. Keep in mind that vacuum leaks are typically only audible when the engine is off. We recommend this model off Amazon, but any old vacuum gauge will do. Once you've confirmed that P0171 is present & you're aware of any other issues present, continue by using a vacuum gauge as demonstrated in the video below.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. First, check for other trouble codes with an OBD scanner like this one from BlueDriver.How to diagnose code P0171 on a Chevrolet Trax: (Eventually) a damaged catalytic converter.Unexpected engine shutoff / the engine dying.If the fuel/air ratio is far too lean, you're more likely to encounter the following symptoms: Hesitation or rumbling from the engine. A lit Malfunction Indicator Lamp or "Check Engine Light".Reduced – potentially severely reduced – engine power.If the fuel/air ratio is a only little weak, you will encounter: Symptoms are pretty wide-raning as well and depend heavily on how severe the problem is. What symptoms are associated with code P0171? A damaged or faulty fuel-pressure regulator.A damaged or otherwise faulty fuel injector(s).A faulty or dirty MAF (Mass Air Flow) sensor.A vacuum leak somewhere downstream of the carburetor.A (typically faulty) fuel pump working at below-standard levels.Top 7 Best Tires For Chevy Trax In 2023 What causes OBD code P0171 on the Chevrolet Trax?Ĭauses are varied but the issue is usually somewhere on the following list:
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