audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 7409 > < Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 7407
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‹› Fuse (SC7) 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: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check.

Start diagnosis

-

Remove the rear engine cover - arrows -.

-

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

-

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

-

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

Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 7409 > < Oxygen Sensor Heaters After Catalytic Converter, Checking|Page 7407