- Vacuum leak
- Dirty MAF sensor
- Faulty oxygen sensor
- Faulty fuel injector
- Faulty fuel pressure regulator
- Clogged catalytic converter
- Engine coolant temperature sensor
Diagnosis
To diagnose the cause of the PO171 code, a qualified technician will need to:
1. Inspect the vacuum lines for leaks and cracks.
2. Clean the MAF sensor.
3. Test the oxygen sensors.
4. Test the fuel injectors.
5. Test the fuel pressure regulator.
6. Check the catalytic converter for blockage.
7. Check the engine coolant temperature sensor.
Repairs
Once the cause of the PO171 code has been diagnosed, the technician will recommend the necessary repairs. Common repairs include:
- Replacing the vacuum lines
- Cleaning or replacing the MAF sensor
- Replacing the oxygen sensors
- Replacing the fuel injectors
- Replacing the fuel pressure regulator
- Replacing the catalytic converter
- Replacing the engine coolant temperature sensor
Cost of Repairs
The cost of repairs for the PO171 code will vary depending on the cause of the code and the labor rates charged by the mechanic. Common repair costs include:
- Vacuum line replacement: $50-$100
- MAF sensor cleaning: $50-$100
- MAF sensor replacement: $100-$200
- Oxygen sensor replacement: $200-$300
- Fuel injector replacement: $200-$400
- Fuel pressure regulator replacement: $100-$200
- Catalytic converter replacement: $400-$800
- Engine coolant temperature sensor replacement: $50-$100
Additional Information
The PO171 code is a common code that can be caused by a variety of factors. If you are experiencing this code, it is important to have your vehicle diagnosed by a qualified technician to identify the cause and to have the repairs performed correctly.
