P00A3Charge Air Cooler Temperature Sensor Circuit High 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
- The charge air cooler temperature sensor for bank 2 (an NTC thermistor) measures the charge air temperature in the second charge-air path, for example on V engines with two charge air coolers. The engine control module uses it for the air mass calculation, boost control and component protection. For P00A3, the sensor signal is above its valid range. With the usual voltage-type NTC sensor this means an open circuit or a short to the reference voltage, and the control module reads an extremely low temperature; with sensors that have a frequency output, a high signal corresponds to an extremely high temperature. 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
- LikelyConnector loose or corroded, or wire interrupted
- PossibleSensor open internally
- PossibleSensor ground interrupted
- 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.