Checking sensor

Fig 1: Location Of Intake Air Temperature (IAT) Sensor G42 with Charge Air Pressure Sensor G31

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Disconnect 4-pin connector from Intake Air Temperature (IAT) Sensor -G42- with Charge Air Pressure Sensor -G31- (arrow).
• Remove Intake Air Temperature (IAT) Sensor -G42-.
• Re-connect harness connector at Intake Air Temperature (IAT) Sensor -G42-.
• Remember the intake air temperature value.

• Spray sensor with commercially available chilling spray while observing temperature value. The temperature must decrease.
• End diagnosis and switch ignition off.

If intake air temperature does not drop:

• Replace Intake Air Temperature (IAT) Sensor -G42- with Charge Air Pressure Sensor -G31-. Refer to Charge air cooler, assembly overview  , item 9 .
• Erase DTC memory of Engine Control Module (ECM). Refer to Diagnostic mode 4: Reset/erase diagnostic data 
• Generate readiness code. Refer to Readiness code, generating