Passat V6-2.8L (ATQ) (2004)
Specified value: 0.40 to 0.50 Volts
-
Switch ignition off.
If specified value is not obtained on one or both Heated Oxygen Sensors (HO2S):
-
Test oxygen sensor wires
If specified values are obtained:
-
Replace the respective oxygen sensor:
-
Heated Oxygen Sensor (HO2S) -G39- before catalytic converter
-
Heated Oxygen Sensor (HO2S) 2 -G108- before catalytic converter.
-
Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data. See: Testing and Inspection/Scan Tool
Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
-
Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking oxygen sensor wires
-
Connect test box to control module wiring harness. connect test box for wiring test. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/Test Box, Connecting For Wiring Test
-
Check wires between test box and 4-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms
Vehicles with engine code AHA
Vehicles with engine code AHA
Continuation for all vehicles
-
Also check wires for short circuit to B+ and to Ground (GND).
Specified value: Infinite ohms
If no malfunctions are found in wires: