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
- Low
- Can I keep driving?
- Yes, no immediate risk
- Estimated cost
- $50 to $450
- 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
P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) Low
The P0138 code means the oxygen sensor after the catalytic converter is stuck at high values. It can point to a truly rich mixture, a contaminated sensor or, quite often, a signal wire shorted to a voltage line. The engine keeps running normally.