Manufacturer's Scan Tool

Oxygen Sensor Aging, Heated Oxygen Sensor (HO2S) -G39-, Checking

Special tools, test equipment and auxiliary items
- Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3B

Test conditions
- Coolant temperature must be at least 85 °C, see display group 04, display zone 3

Functional check
- Connect scan tool VAG 1551 (VAG 1552). Start engine and select "Address word" 01 of engine control module. When doing this the engine must be running at idle speed. Connecting scan tool and selecting Engine Control Module (ECM).. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAG 1551 Scan Tool", Testing and Inspection

Indicated on display

Rapid data transfer HELP
Select function XX

- Press keys 0 and 4 for the function "Basic Setting" and confirm entry with Q key.

Indicated on display

Basic setting
Input display group number XXX

- Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.

Indicated on display (1-4 = Display zones)

System in basic setting 34 ->
1 2 3 4

- Check specifications in display zones 1-4.

If the diagnostic is initiated from engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON."

Display Group 34:

If the specifications are obtained:
- Press -> key.
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch off ignition.

Continuation

If the specifications are not attained:
- Carry out a road test to free oxygen sensor of possible residues and repeat the test.

Observe the valid safety precautions when carrying out a road test.

If the specifications are again not attained:
- Replace oxygen sensor before catalyst (G39), item 13.

- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, checking and erasing DTC memory. Refer to "Displaying, Reading and Erasing Trouble Codes/With Manufacturers Scan Tool/DTC Memory, Checking And Erasing", Testing and Inspection
- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again.
Refer to "Monitors Trips and/or Drive Cycle/Displaying Readiness Code", Testing and Inspection
Refer to "Monitors Trips and/or Drive Cycle/Generating Readiness Code", Testing and Inspection