Audi
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    AC/heater air temperature control switch - short to ground
Cause:
    Wiring short to ground, AC/heater air temperature control switch

BMW
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Knock sensor(s) (KS) - circuit malfunction
Cause:
    Wiring, connector, KS incorrectly tightened, KS

Mercedes-Benz
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Engine control module (ECM), knock control - defective
Cause:
    Fuel contamination, mechanical fault, ECM

Volkswagen
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    AC/heater air temperature control switch - short to ground
Cause:
    Wiring short to ground, AC/heater air temperature control switch