P1418
Secondary Air Injection System Relay 'A' Control Circuit High
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Check Engine Light Is On
- Deterioration of engine performance when cold
- Increased emissions
- Possible misfires when warming up
- Noise from the secondary air pump
Causes
- Short circuit to positive in the relay control circuit
- Faulty secondary air relay
- Wiring harness damage
- Problems with the engine control unit
- Corrosion of contacts or connectors
How to Fix
- Check the integrity of the system wiring harness
- Test secondary air relay
- Check control circuit voltage
- Replace relay if necessary
- Clean or replace damaged connectors