Volkswagen Workshop Manuals
Eos (1F7) V6-3.2L (BUB) (2008)
Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Testing and Inspection > Functions, Checking > Page 1065
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Heaters Z19 and Z28, Checking
The following procedure is used to diagnose Oxygen Sensor (O2S) Heater (Z19) and Oxygen Sensor (O2S) 2 Heater (Z28).
‹› When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Special tools, testers and auxiliary items required
‹› Wiring diagram.
‹› The Heated Oxygen Sensor (HO2S) Fuse 11 (on fuse panel B) (SB11) OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Powertrain Management/Computers and
Checking internal resistance
Disconnect the Heated Oxygen Sensor (HO2S) (G39 ) electrical harness connector - 2 - or the Heated Oxygen Sensor (HO2S) 2 (G108) electrical
Using a multimeter, check the Heated Oxygen Sensor (HO2S) terminals 3 to 4 for an open circuit.
Specified value: 2.5 to 10.0 ohms (at approx. 20° C)
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