P0172 is a code for too rich a mixture in Bank 1. This can be caused by a faulty oxygen sensor, mass air flow sensor, or fuel injector. It can also be caused by a vacuum leak or a problem with the fuel pressure regulator.
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- error code p0172
1. Check for vacuum leaks and repair as necessary
- Remove the screws that fasten the fuel rail to the engine block.
- Lift the fuel rail off of the engine block.
- Check for any cracks or tears in the fuel rail. If there are any, replace the fuel rail.
- Check for any vacuum leaks around the fuel rail. If there are any, repair the leaks.
- Replace the fuel filter if necessary.
- Reinstall the fuel rail and screws.
2. Check the engine's air filter and replace it if it is dirty
- Remove the air filter cover.
- Locate the air filter. It is usually located on the left or right side of the engine.
- Remove the air filter.
- Clean the air filter.
- Replace the air filter.
3. Inspect the engine's oxygen sensors and replace them if they are faulty
- Start the vehicle and allow it to idle for a few minutes to warm up the engine.
- Locate the oxygen sensor bungs on either side of the engine.
- Disconnect the oxygen sensor connectors.
- Inspect the oxygen sensor for damage. If the sensor is damaged, replace it.
- Reconnect the oxygen sensor connectors.
- Start the vehicle and drive it for a few minutes to check for any irregularities. If there are no problems, replace the oxygen sensor.
4. Check the fuel injectors and clean or replace them if they are dirty
- Disconnect the negative battery cable.
- Remove the fuel rail cover.
- Remove the fuel injectors.
- Clean the injectors if necessary.
- Reinstall the fuel injectors.
- Connect the negative battery cable.
- Reconnect the air intake hose.
- Reconnect the exhaust hose.
- Start the engine and check the engine performance.
Some users might also have success with the following opitons:
- Adjust the air/fuel mixture by turning the mixture screws on the carburetor.
- Have the engine's computer system checked for faults.