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#OXYGEN NOT INCLUDED DATA BANK CODE#

The prices are including parts and labor. Here are some examples of the repair costs of the P0171 code. If you find it giving wrong values – replace it. 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.

#OXYGEN NOT INCLUDED DATA BANK CODE#

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, temperature sensors, and figure out if their signals are logical or way out of range.

Follow the diagnose 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 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).

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. P0171 – System Too Lean (Bank 1) What does the P0171 code mean?