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Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 716 > < Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 714
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Oxygen Sensor: Testing and Inspection
Oxygen Sensor (O2S) Heater (Z19), 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 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

‹› Fuse (SB6) OK.

‹› Motronic Engine Control Module (ECM) Power Supply Relay (J271) 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

-

Perform a preliminary check to verify the customers complaint. Refer to => [ replacing ] See: Powertrain Management/Computers and Control
Systems/Engine Control Module/Testing and Inspection/Engine Control Module (ECM) (J623).

Start diagnosis

-

Remove the engine cover with air filter. Refer to 2.0 Liter 4-Cyl. 4V Turbo Fuel Injection & Ignition, Engine Code(s): BWA. Repair Group 24.

Checking internal resistance

-

Disconnect the Heated Oxygen Sensor (HO2S) (G39 ) electrical harness connector - 1 -.

Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 716 > < Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor Regulation Before Catalytic Converter, Checking|Page 714