P00ACIntake Air Temperature Sensor 1 Circuit Low Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Intake air temperature sensor 1 for bank 2 measures the intake air temperature in the second intake path, typically near the air filter or in the air flow meter of that bank, on engines with two separate intake paths. For P00AC, the sensor signal is below its valid range. With the usual voltage-type NTC sensor this means a short to ground, and the control module reads an extremely high temperature; some manufacturers use sensors with a frequency output, where a low signal instead corresponds to an extremely low temperature (open circuit or short to ground). Bank 2 codes occur only on engines with two separate intake or charge-air paths, one per cylinder bank.
- What you may notice
- Check engine light on
- Usually no noticeable symptoms
- Slightly changed power or knock control with an implausible reading
- Likely causes
- LikelySensor shorted internally or signal wire shorted to ground
- PossibleConnector damp or corroded
- PossibleOn frequency-output sensors: open circuit
- RareEngine control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.