Intake Air Heater A Circuit
Intake Air Heater A Circuit: an electrical fault is present in the circuit. Used on diesel and some petrol engines for cold-start emissions and starting reliability.
Affected components
- Intake air heater
- Heater relay
- Heater wiring
Common causes
- High likelihood: Heater element open or shorted
- Medium likelihood: Heater relay defective
- Low likelihood: Wiring fault
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.