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, no immediate risk
- Estimated cost
- $80 to $350
- 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
P2251 O2 Sensor Negative Current Control Circuit/Open (Bank 1 Sensor 1) Medium
The P2251 code means there is an open circuit in the negative current line of the wideband oxygen sensor on bank 1. Without that line, the computer cannot measure the mixture and falls back on fixed values. You can drive with caution, but fuel use goes up and the engine may run worse.