OBD-II code · Powertrain (generic)
P009A Intake Air Temperature/Ambient Air Temperature Correlation
Intake air temperature and ambient air temperature readings deviate beyond plausible limits — at engine off both should match within tolerance.
Is it safe to drive with P009A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOne sensor drifted
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Iat Sensor, Ambient Air Temp Sensor
Related codes
- P0097Intake Air Temperature Sensor 2 Circuit Low Bank 1
- P0098Intake Air Temperature Sensor 2 Circuit High Bank 1
- P0099Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1
- P009BFuel Pressure Relief Control Circuit/Open
- P009CFuel Pressure Relief Control Circuit Low
- P009DFuel Pressure Relief Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.