Aging Check

Oxygen Sensor Aging, Oxygen Sensor After Three Way Catalytic Converter (TWC) (Trimmer Adjustment)

Special tools and equipment
- VAG1551 scan tool (or VAG1552 mobile scan tool) with VAG1551/3B cable

Test requirement
- Coolant temperature must be at least 80 °C, See Display group 04, display field 3
- Connect VAG1551 scan tool (VAG1552). Start engine and select the Engine Control Module (ECM) using address word 01.

Connecting scan tool and selecting ECM. Refer to " Scan Tool Testing/Scan Tool Connecting and Initial Checks " Testing and Inspection

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -4- to select "Basic Setting" function 04. Press -Q- button to confirm input.

Indicated on display:


Basic Setting
Enter display group number XXX


- Press buttons -0-, -4- and -3- to select "Display group number 43". Press -Q- button to confirm input.

Indicated on display: (1 to 4 = display fields)


System In basic setting 43 ->
1 2 3 4


- Depress brake pedal and hold down.
- Depress accelerator pedal until it is in Wide Open Throttle (WOT) position.


NOTE: The Engine Control Module (ECM) raises engine speed to between 2000 and 2300 RPM.


- Hold the RPM until the catalytic converter temperature in display field 2 over 350 °C climbs.
- Check during this whether indication in display field 4 jumps from "Test OFF" to "Test ON".
- Continue to hold brake pedal in the depressed position, until display field 4 indicates the specified value "B1-S2 OK" is indicated.

If indications do not resemble description:
- Release brake and accelerator pedal.
- Check oxygen sensor and oxygen sensor control behind Three Way Catalytic Converter (TWC). Sensor and Control Check
- Read readiness code. Refer to Monitors, Trip and/or Drive Cycle (Readiness Codes)/Reading Readiness Code. Testing and Inspection

If DTC memory was erased or the Engine Control Module (ECM) was disconnected from the continuous B+ supply, the readiness code must be re-generated. Refer to Monitors, Trip and/or Drive Cycle (Readiness Codes)/Generating Readiness Code. Testing and Inspection