General fault in the secondary air injection system used to reduce cold-start emissions.
SYMPTOMS
- Check-engine light
LIKELY CAUSES
- Failed secondary air pump
- Stuck change-over valve
- Blocked hoses
- Wiring/relay fault
DIAGNOSIS STEPS
- Test the pump and valve
- Inspect hoses
- Check the relay and wiring
RELATED PARTS
- Secondary air pump
- Combination valve