P0072
Ambient Air Temperature Sensor Circuit A Low
Ambient air temperature sensor A signal voltage below the expected range — typically a short to ground.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to groundCommon
Parts involved
- Ambient Air Temp Sensor
- Sensor Wiring
P0072 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.