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
- $20 to $400
- 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
P0418 Secondary Air Injection System Relay A Circuit Low
The P0418 code means the computer found an electrical fault in the control circuit of the secondary air pump relay. A relay that does not close leaves the pump dead, and one that sticks closed runs it all the time. Check the fuse, the relay and the connector before you replace the pump.