OBD-II code · Powertrain (generic)
P00A9 Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 2
Intermittent dropouts or noise on IAT sensor 2 bank 2 signal. The intake air temperature sensor feeds the ECM's density calculation — a drifted reading miscalculates fuel mass and pushes mixture lean (cold reading) or rich (hot reading).
Is it safe to drive with P00A9?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyConnector loose or corroded
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Iat Sensor 2, Sensor Wiring
Related codes
- P0099Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 1
- P00ECIntake Air Temperature Sensor 3 Circuit Intermittent/Erratic Bank 1
- P00F1Intake Air Temperature Sensor 3 Circuit Intermittent/Erratic Bank 2
- P00A6Intake Air Temperature Sensor 2 Circuit Range/Performance Bank 2
- P00A7Intake Air Temperature Sensor 2 Circuit Low Bank 2
- P00A8Intake Air Temperature Sensor 2 Circuit High Bank 2
- P00AAIntake Air Temperature Sensor 1 Circuit Bank 2
- P00ABIntake Air Temperature Sensor 1 Circuit Range/Performance Bank 2
- P00ACIntake Air Temperature Sensor 1 Circuit Low Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.