KlaroFault codeP0071
MODERATEAmbient Air Temperature Sensor Range/Performance
What this code means
Ambient Air Temperature Sensor Range/Performance.
P0071 is a generic code: it means the same thing on every make. P0071 belongs to family P00xx — Fuel and air metering, auxiliary emission controls. Its page explains how to read a code and groups all its codes by part.
Type of fault
The signal stays within its electrical limits, but its value is not plausible: it does not match what the control unit expects given the other sensors. The sensor may be drifting with age, but it may also be faithfully measuring a real mechanical problem — a leak, a blockage, an air leak. Replacing the sensor without checking does not always clear the fault.
Ambient air temperature sensor
The ambient temperature sensor, usually behind the front bumper or in a door mirror, measures the outside temperature. The engine control unit uses it for some corrections, and it also feeds the dashboard display and the air conditioning.
What you notice
Wrong outside temperature on the dashboard, air conditioning that behaves oddly; the engine itself runs normally in most cases.
How to check it
Its location makes it vulnerable to knocks, gravel and water: check the sensor and its connector behind the bumper. Car parked for several hours, its reading in Klaro should be close to the intake air temperature.
Watch it live in Klaro
With an OBD2 adapter plugged in, these live readings show the part at work, when your car reports them:
- Ambient air temperature
- Intake air temperature
What to do
Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.
Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →
How to read this code
- PPowertrain
- 0standardised code
- 0Fuel and air metering, auxiliary emission controls
- 71P0071
