P00A1Charge Air Cooler Temperature Sensor Circuit Range/Performance 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 P00A1, this is a plausibility check: at a start after a long standstill the sensor is compared with other temperature sensors (for example coolant temperature or the matching sensor of the other bank), which should then agree. No manufacturer description naming this exact code was found. 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
- Emissions test or readiness check may fail
- Likely causes
- LikelySensor drifting or coated with oil or soot
- PossibleContact resistance at the connector
- PossibleComparison sensor faulty
- RareEngine block heater or auxiliary heater distorting the start comparison
- 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.