Oxygen Sensors Behind Catalytic Converter, Checking Aging

Oxygen Sensors Behind Catalytic Converter, Checking Aging

Special tools and equipment







- VAS5051 with VAS5051/1

Test requirements
- Engine coolant temperature at least 80 degrees C, display group 004, display zone 3.

Test sequence
- Connect testing and information system VAS5051 and select vehicle system "01 -Engine electronics" in selection. Engine must be running at idling speed.







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-.







- Press square button.
(Cont.)

If specification in display zones -3- and -4- is not obtained:
- Perform test drive to free oxygen sensors 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 oxygen sensor behind catalytic converter.