OBD-II code · Powertrain (generic)
P00AC Intake Air Temperature Sensor 1 Circuit Low Bank 2
IAT sensor 1 bank 2 signal voltage below expected range. 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 P00AC?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Iat Sensor 1, Sensor Wiring
Related codes
- P0097Intake Air Temperature Sensor 2 Circuit Low Bank 1
- P00A7Intake Air Temperature Sensor 2 Circuit Low Bank 2
- P00EAIntake Air Temperature Sensor 3 Circuit Low Bank 1
- P00EFIntake Air Temperature Sensor 3 Circuit Low Bank 2
- P00A9Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic Bank 2
- P00AAIntake Air Temperature Sensor 1 Circuit Bank 2
- P00ABIntake Air Temperature Sensor 1 Circuit Range/Performance Bank 2
- P00ADIntake Air Temperature Sensor 1 Circuit High Bank 2
- P00AEIntake Air Temperature Sensor 1 Circuit Intermittent Bank 2
- P00AFTurbocharger/Supercharger Boost Control A Module Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.