audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 3120 > < Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 3118
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‹› 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 => [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check.

Start diagnosis

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Remove the rear engine cover - arrows -.

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Remove the vacuum lines - 3 - and - 4 - from the air guide hose.

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Disconnect the Mass Air Flow (MAF) Sensor (G70) electrical harness connector - 1 -.

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Loosen the hose clamps - 2 - and - 5 - and remove the air guide hose.

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Disconnect the Heated Oxygen Sensor (HO2S) 2 (G108) electrical harness connector - 3 -.

Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 3120 > < Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 3118