New Beetle L5-2.5L (BPR) (2007)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Before Catalytic Converter, Checking Heater
Diagnostic Procedures
Oxygen Sensor before Catalytic Converter, Checking Heater
‹› When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S) (G39), use only gold-plated terminals.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Heated Oxygen Sensor (HO2S) (G39) fuse S-243 is 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 connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check
Start diagnosis
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Remove the engine cover with air filter. Refer to the Repair Information.
Checking internal resistance
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Disconnect the Heated Oxygen Sensor (HO2S) (G39 ) electrical harness connector.
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) connector between terminals 3 and 4 for resistance.