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

P00A3 Charge Air Cooler Temperature Sensor Circuit High 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 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.

Likely causes

Connector loose or corroded, or wire interrupted
Sensor open internally
Sensor ground interrupted
Engine control module faulty

Symptoms

  • Check engine light on
  • Usually no noticeable symptoms
  • Slightly changed power or knock control with an implausible reading

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

P00A0P00A1P00A2P00A4P007D

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