P0073
Ambient Air Temperature Sensor Circuit A High
Ambient air temperature sensor A signal voltage above the expected range — typically open circuit (broken wire or sensor) or short to power.
- 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 openCommon
Parts involved
- Ambient Air Temp Sensor
- Sensor Wiring
P0073 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.