audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking|Page 6640 > < Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking|Page 6638
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harness connector T94 terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained:

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Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

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Check the electrical harness connector for damage, corrosion, lose or broken terminals.

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If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring:

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Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Diagnostic Modes 01 - 09/Diagnostic Mode 04 - Erase DTC Memory 

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Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to => [ Readiness Code ] See: Computers and Control Systems/Testing and Inspection/Monitors,
Trips, Drive Cycles and Readiness Codes.

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End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

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Replace the Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair/Engine Control Module, Replacing.

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Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence:

Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking|Page 6640 > < Heated Oxygen Sensors and Oxygen Sensor Regulation before Catalytic Converter, Checking|Page 6638