P0071 Ambient air temperature sensor range/performance
What P0071 means
The engine computer compares the ambient temperature sensor with other temperature sensors, such as intake air temperature, after the car has stood for a while. P0071 means the ambient reading does not match what it expects. It affects the temperature display and climate control but does not harm the engine.
P0071 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Low
- Typical repair cost
- 30–200 €
- Workshop time
- 0.3–1 h
- Repair difficulty
- Easy
- DIY possible
- Yes
- Check engine light
- Yes
- Affects emissions test
- No
- Limp mode possible
- No
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Outside temperature display wrong or slow to update
- Climate control working poorly
- Check engine light on
- Often no other symptoms
Common causes
- Faulty ambient temperature sensor
- Poor connection or corrosion at the connector
- Sensor dislodged and heated by the engine or radiator
- Faulty intake air temperature sensor used as reference
- Wiring with high resistance
Can I keep driving with P0071?
Yes, you can drive. Have it repaired within about a week.
What to check first
- Compare ambient and intake air temperature readings after the car has stood overnight
- Check the sensor is correctly mounted in the airflow
- Check the connector for corrosion
- Replace the sensor if its reading is wrong
Related codes
- P0072 Ambient air temperature sensor circuit low
- P0073 Ambient air temperature sensor circuit high
- P0087 Fuel rail/system pressure too low (bank 1)
- P0088 Fuel rail pressure too high (bank 1)
- P0089 Fuel pressure regulator 1 performance
- P008A Low-pressure fuel system pressure too low
- P0093 Fuel system leak detected - large leak
- P0045 Turbocharger/supercharger boost control A circuit/open
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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