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
- $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
P0402 Exhaust Gas Recirculation Flow Excessive Detected Medium
The P0402 code means more gas is passing through the EGR system than the computer asked for. It is usually a valve that will not close because of carbon on its seat. The result is a rough idle or an engine that stalls.