audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor HO2S, Checking|Page 1112 > < Heated Oxygen Sensor HO2S, Checking|Page 1110
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Oxygen Sensor: Testing and Inspection
Oxygen Sensor O2S 2 Heater Behind TWC Catalytic Converter, Checking

Diagnostic Procedures

Oxygen Sensor O2S 2 Heater Behind TWC Catalytic Converter, Checking

Observe all safety precautions: => [ Safety Precautions ] See: Powertrain Management/Computers and Control Systems/Service Precautions/Safety
Precautions

View clean working conditions: => [ Clean Working Conditions ] See: Powertrain Management/Computers and Control Systems/Service
Precautions/Clean Working Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

‹› Oxygen Sensor (O2S) 2 Behind TWC Catalytic Converter Heater (Z30) is part of Oxygen Sensor (O2S) Before Three Way Catalytic Converter

(G131) and cannot be replaced separately.

Special tools, testers and auxiliary items required

‹› multimeter.

‹› Wiring diagram.

Test requirements

‹› Fuse (SB9) 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 => [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check.

Start diagnosis

-

Remove right cover from vehicle underbody. Refer to the appropriate service information.

Checking internal resistance

-

Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector - 2 -.

Heated Oxygen Sensor HO2S, Checking|Page 1112 > < Heated Oxygen Sensor HO2S, Checking|Page 1110