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If it is too low, check the fuel filter, fuel pump, fuel pressure, and regulator. Connect a fuel pressure gauge to the fuel rail and make sure that the fuel pressure is correct. You will find a leak or a faulty one-way valve that is causing the P0171 code in most cases. Check the PCV valve and the EVAP purge valve.
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How to diagnose the P0171 Codeĭiagnosing the P0171 code is easy if you have the right tools to do it. If you start replacing MAF sensors, O2 sensors, etc., you will probably spend a lot of money without results.Ī faulty O2 sensor is not a very common cause of the P0171 code, even if many people start to replace it directly when they see this code. In most cases, the P0171 code is caused by something easy as a vacuum leak or a bad PCV valve. Replace the fuel pump/fuel filter/fuel pressure regulator or repair wiringsĪ common diagnostic mistake is to start replacing parts without making a proper diagnosis.Replace faulty vacuum hoses or gaskets around the intake.Here are the most common fixes to the P0171 code. There are many different solutions for the P0171 code because there can be so many different causes. Low fuel pressure (Caused by a bad fuel pump, filter, or fuel pressure regulator).Air intake/vacuum/boost pipe leak (Most common).
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The following issues can be caused by the P0171 code: There are actually many different things that can cause a lean mixture. The P0171 tells us that there is a lean air-fuel mixture, but it doesn’t tell us what could cause a lean fuel mixture. It is okay to drive for short distances to the workshop, but ignoring the code and continue to drive may cause integral engine parts to take damage. It might be the first sign of something that will fail more soon, like a clogged fuel filter or a failing fuel pump. Other times your car engine may actually run so lean that your engine parts are in danger on high load. Moderate – In most cases, the lean mixture is significant, and you will not notice any difference in the engine’s performance. If the fuel mixture is very lean, you may get any of the following symptoms: If the fuel mixture is slightly lean, you will often get no other symptoms from the P0171 code other than the check engine light on your dashboard. If it needs to correct the air-fuel mixture more than that, the P0171 code will be stored. The Oxygen O2 sensors have the ability to correct a fuel mixture of +-15%. The P0171 code means that the Oxygen (O2) sensor on bank 1 recognized a too lean mixture to correct it. Find out more about our advertising opportunities.P0171 – System Too Lean (Bank 1) What does the P0171 code mean? Advertise Advertising on is well-targeted, has unique benefits, and is highly successful. Looking for something lighter? Read our funny complaints to see people who found humor in a bad situation. Vehicle Problems Find out what cars to avoid, view the latest problem trends, or keep up-to-date with the most recently reported problems. Contact us with any comments or concerns.
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