A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
Specified value: 2.5 to 10.0 ohms (at approx. 20° C)
If the specification was not obtained:
-
Replace the Heated Oxygen Sensor (HO2S) (G39). Refer to Fuel Injection and Ignition Repair Information.
If the specification was obtained:
Checking voltage supply
-
Crank the engine (engine may run).
-
Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 4 to Ground (GND) for voltage.
-
Switch the ignition off.
Specified value: Battery voltage.
If the specification was not obtained:
-
Check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 4 to the Engine Component Power Supply Relay (J757)
socket 2/87 for an open circuit, a short circuit to each other, Battery (+), or Ground (GND).
-
Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-
If necessary, repair the faulty wiring connection.