Powertrain, generic · Fuel and air metering, auxiliary emission controls

P00A1 Charge Air Cooler Temperature Sensor Circuit Range/Performance Bank 2

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Sensor drifting or coated with oil or soot
Contact resistance at the connector
Comparison sensor faulty
Engine block heater or auxiliary heater distorting the start comparison

Symptoms

  • Check engine light on
  • Usually no noticeable symptoms
  • Emissions test or readiness check may fail

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–250
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

charge air cooler temperature sensor bank2charge air cooler temperature sensor wiring

Related codes

P00A0P00A2P00A3P00A4P007F

References: law.cornell.edu, static.nhtsa.gov, en.wikipedia.org.