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
- $40 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
P2099 Post Catalyst Fuel Trim System Too Rich (Bank 2) Medium
The P2099 code means the computer, using the oxygen sensor behind the catalytic converter, had to correct the bank 2 mixture past its limit because it saw the engine running too rich. The car usually drives normally. The cause is often a front sensor reading falsely lean, leaking injectors or too much fuel vapor from the charcoal canister.