P0071 Code: Ambient Air Temp Sensor Range — Causes & Fix
P0071 means the ambient (outside) air temperature sensor reading is out of its expected range — the sensor used for climate control and some fuel calculations.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $20 – $250
- Time to fix
- 30 minutes – 2 hours
What it means
Causes include a failed ambient temp sensor, a connector fault, or damaged wiring. P0071 is a generic OBD-II code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer OBD-II vehicle regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Wrong outside-temp display
- Minor climate-control quirks
How to fix it
- 1
Inspect the sensor and wiring
1. Locate the ambient temp sensor (often behind the front grille). 2. Check the connector and wiring.
- 2
Test/replace the sensor
1. Compare the reading to actual temperature. 2. Replace if out of range, then clear the code.
Frequently asked questions
Is P0071 serious?
No — it mainly affects the outside-temperature display and minor calculations. It is worth fixing so climate control behaves correctly.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.