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
- $20 to $600
- 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
P0171 System Too Lean (Bank 1) Medium
The P0171 code means the computer had to add fuel for a long time to make up for a lean mixture and ran out of room to correct. Either more air is getting in than the computer measures, or less fuel is arriving than it commands. Unmetered air leaks are by far the most common cause.