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
- High
- Can I keep driving?
- No, stop and have it checked
- Estimated cost
- $50 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
P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance High
The P0121 code means the main throttle position signal is within valid ranges but does not behave as it should: it shows jumps, dead spots or does not match what the engine is doing. The cause is usually a worn sensor track or, on the throttle body, carbon buildup that keeps the plate from reaching the position being read.