Cause
Seized secondary air injection pump
The pump seized, usually by water that reached it through a failed check valve. The valve is what let it happen and costs a fraction of the pump, so replacing the pump alone means doing it again — and the pump only runs for a short period after a cold start, so nobody notices until a code appears.
Typically a moderate job.
Codes this can cause (6)
Codes where this is a likely explanation first, rather than merely a possible one.
- P2257 Secondary Air Injection System Control A Circuit Low Likely for this code Moderate
- P2431 Secondary Air Injection System Air Flow Pressure Sensor Circuit Range/Performance Bank 1 Likely for this code Moderate
- P2445 Secondary Air Injection System Pump Stuck Off Bank 1 Likely for this code Moderate
- P2447 Secondary Air Injection System Pump Stuck Off Bank 2 Likely for this code Moderate
- P2435 Secondary Air Injection System Air Flow Pressure Sensor Circuit Bank 2 Moderate
- P2436 Secondary Air Injection System Air Flow Pressure Sensor Circuit Range/Performance Bank 2 Moderate
Information, not instruction
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