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
- $100 to $1,200
- 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
P0411 Secondary Air Injection System Incorrect Flow Detected Low
The P0411 code means the computer did not detect the secondary air flow it expects. It is usually a weak pump, a stuck check valve or clogged air passages. The engine runs normally, but the vehicle will not pass an emissions inspection.