P011F
Engine Coolant Temperature 2 / Ambient Air Temperature Correlation
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace the engine coolant temperature sensor if necessary
- Inspect and repair any loose or damaged wiring connections related to the coolant temperature sensor
- Check and replace the ambient air temperature sensor if necessary
- Inspect and repair any issues with the engine cooling system, such as a blocked radiator or malfunctioning thermostat
Common causes
Most likely first
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty Ambient Air Temperature (AAT) sensor
- Loss of coolant or low coolant level
- Blocked or restricted coolant flow
- Malfunctioning thermostat
How to diagnose & fix
Work through it in order
- Engine overheating
- Decreased fuel efficiency
- Rough idling or stalling
- Check engine light illuminating
- Problems with starting the vehicle
Read & clear P011F yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.