P1291
No Temperature Rise Seen From Intake Air Heater
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Difficulty starting the engine in cold weather
- Increased fuel consumption
- Increased emissions
- Check Engine Light Is On
- Reduced engine power in cold conditions
Causes
- Intake air heater malfunction
- Open or short circuit in the heater circuit
- Heater relay problems
- Intake air temperature sensor malfunction
- Problems with the engine control unit
How to Fix
- Check the power and ground of the heater circuit
- Check heater resistance
- Check the operation of the heater relay
- Check intake air temperature sensors
- If necessary, replace the intake air heater