Aging Check

Oxygen Sensor Aging Of Oxygen Sensors Behind Three Way Catalytic Converter (TWC), Checking

Special tools and equipment







- VAS5051 with VAS5051/1

Test requirements:
- Coolant temperature at least 80 degree C, see display group 004, display zone 3.

Test sequence
- Connect testing and information system VAS5051 and select vehicle system "01 -Engine electronics". Engine must be running at idling speed. Connecting VAS 5051 Scan Tool

Display on VAS5051:







- Under -1 - select diagnostic function "04 - Basic setting".

Display on VAS5051:







1 - Enter display group
- Enter "194" for "display group number 194" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051:







- Activate basic setting by pressing -A- button.
- Press accelerator and brake pedal simultaneously; engine speed increases to approx. 2200 rpm.

Test conditions:
- Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2200 rpm.
- Check specification in display zones -3- and -4-.

Display Group 194:

- Exit function "04 - Basic setting" by pressing <- button.

Continued

If specification in display zones -3- and -4-. is not obtained:
- Perform test drive to free heated oxygen sensor (HO2S) from any possible residues and repeat test.

If specification in display zones -3- and -4- is not obtained even after a test drive has been performed:
- Replace relevant heated oxygen sensor (HO2S) behind catalytic converter.