Multi-code OBD2 diagnosis
Enter all the codes your scanner showed, not just the first one. We give you the overall severity, whether you can keep driving, the order in which to check them and how they relate to each other.
Summary
- Overall severity
- Medium
- Can I keep driving?
- Yes, but with caution
- Estimated cost
- $80 to $500
- Codes analyzed
- 1 of 1
The order below is the recommended one: first the codes that can cause the others. After each repair, clear the codes and check which ones come back.
Order of inspection
P0177 Fuel Composition Sensor Circuit Range/Performance Medium
The P0177 code means the fuel composition sensor reading is electrically valid but does not agree with the other sensors. It is usually a sensor that reads wrong or gets stuck, although it can also be a real abnormal condition in the engine.