audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 3351 > < Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 3349
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‹› Fuse (SA7) 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

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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 coolant reservoir - arrow - and disconnect electrical connector on Engine Coolant Level (ECL) Warning Switch (F66) at bottom of
coolant reservoir.

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Remove the screw - arrow - retaining the coolant reservoir.

-

Remove the coolant reservoir and disconnect the Engine Coolant Level (ECL) Warning Switch (F66) electrical harness connector. 

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 Position the coolant reservoir aside with the coolant hoses -  1 through 3 - attached.

Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 3351 > < Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking|Page 3349