Aging Check

Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, Checking Aging

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required







- VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable

NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.

Test prerequisites







- The fuses must be OK.
- The battery voltage must be at least 11.5 V.
- All electrical accessories, e.g. lights and rear window heating must be switched off.
- If the vehicle is equipped with air conditioning, it must be turned off.
- Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
- Exhaust system between Three Way Catalytic Converter (TWC) and cylinder head must be free of leaks.
- Coolant temperature must be at least 85 degrees C, See display group 1, display zone 2.
- Three Way Catalytic Converter (TWC) temperature must be at least 380 degrees C, See display group 34, display zone 2.

Functional check
- Connect VAG 1551 Scan tool (or VAG 1552) and select engine electronics control module with the "Address word" 01. When doing this the engine must be running at idle speed: ((VAG 1551 and Motronic Engine Control Module (ECM) -J220-, connecting and selecting).
[1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -4- for function "Initiate basic setting" and confirm entry with -Q- button.

Indicated on display:


Basic setting
Input display group number XXX


- Press buttons -0-, -4- and -3- for "Display group number 43" and confirm entry with -Q- button.

Indicated on display: (1...4 = display zones)


System in basic setting 43 ->
1 2 3 4


- Depress brake pedal and hold.
- Depress accelerator down to full throttle position.
- Engine speed will be increased by Motronic Engine Control Module (ECM) -J220- to approx. 2300 rpm.
- Depress brake pedal and accelerator down and hold until display in display zone 4 jumps from "Test OFF" to "Test ON."
- When performing this test the Three Way Catalytic Converter (TWC) temperature in display zone 2 must be at least 380 degrees C.

NOTE: This process can take approx. 30 seconds.

- Depress and hold brake pedal and accelerator until display zone 4 displays specification "B1-P2 OK."
- Release brake and accelerator pedals.
- Press the -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.

If the display does not indicate as described:
- Carry out a road test to remove possible residue on Oxygen Sensor (O2S) and repeat check.

Observe the valid safety precautions when carrying out a road test. Refer to "Fuel Delivery and Air Induction/Service Precautions".
[1][2]Technician Safety Information

If the display does not indicate as described again:
- Check Oxygen Sensor (O2S) and Oxygen Sensor control after Three Way Catalytic Converter (TWC).
Testing and Inspection