TT Quattro Coupe V6-3.2L (CBRA) (2008)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Heater Before Catalytic Converter, Checking
Oxygen Sensor Heater before Catalytic Converter, Checking
Oxygen Sensor (O2S) Heater (Z19), Checking
‹› Oxygen Sensor (O2S) Heater (Z19) is part of Heated Oxygen Sensor (HO2S) (G39) and cannot be replaced separately.
‹› When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› Fuse (SB2) OK.
‹› Fuel Pump (FP) 2 Relay (J49) 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.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => See: Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Mode 09 - Read Vehicle Information.
Start diagnosis
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Remove the engine cover with air filter.
Checking internal resistance
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Disconnect the Heated Oxygen Sensor (HO2S) (G39 ) electrical harness connector - 2 -.