O2 Sensor Circuit – Low Voltage – Bank 1 Sensor 1 Understanding the P0131 OBD II Code Chevy Trax P0131 Definition If the sensor’s voltage remains low for longer than two minutes, the ECM (Engine Control Module) interprets it as a low voltage condition, triggering the P0131 code and illuminating the malfunction indicator light (MIL). This sensor plays a crucial role in maintaining optimal engine performance by detecting the air-fuel ratio in the exhaust, then sending this data to the Trax’s engine control module (ECM).Ī damaged or faulty oxygen sensor is the primary cause of this code. If you find it giving wrong values – replace it.The P0131 code is an OBD-II diagnostic trouble code that indicates low voltage in the Chevy Trax’s Oxygen (O2) sensor circuit for Bank 1, Sensor 1 (B1S1). If the problem still occurs and you haven’t found any problems with the mentioned parts above, it is time to diagnose your O2 sensor.Check for exhaust pipe leaks before the O2 sensor.It might also be damaged, so check its values on idle and on pressure and replace it if faulty. After it, you should try to clear the trouble codes and check if the code comes back. Inspect it and check for any dirt on the sensor. A dirty MAF sensor can cause the air-fuel mixture. If possible, try to check the valve inside it while you open and close it with your diagnostic tool. An EGR valve stuck open can cause the air-fuel mixture to stay lean. 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. Connect an EVAP smoke machine to your car’s inlet and check for any intake leaks.Check the live data for the MAF sensor and temperature sensors to figure out if their signals are logical or way out of range.Follow the diagnosis procedure on the other trouble code if you get any. Recheck the trouble codes and find any other related trouble codes that could cause a lean mixture. Connect an OBD2 scanner to your vehicle.In most cases, you can lend these tools at a workshop if you ask nicely. This guide is made for professionals with access to these tools. It is most often not easy to diagnose the P0171 without these tools. Recommended Tools for Diagnosisĭiagnosing 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 wiringĪ 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.
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