Oxygen Sensors Before Catalytic Converter, Checking Aging

Oxygen Sensors before Catalytic Converter, Checking Aging

Special tools, testers and auxiliary items required

• (VAS5051) with (VAS5051/1)

Test requirements:

• Engine coolant temperature at least 80 °C => display group 004, display zone 3.

Test sequence

- Connect testing and information system (VAS5051 ) and select vehicle system "01 - Engine electronics" in selection. Refer to => [ VAS 5051, Connecting and Select Functions ] VAS 5051, Connecting and Select Functions. 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

- Select function "197" in button field - 2 - for " display group number 197" and press Q button to confirm input.

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 specifications in display zones - 3 - and - 4 -.





Note on display zones 1 and 3:

The dynamics factor is the characteristic for the aging of the oxygen sensor. The lower the dynamics factor the more advanced is the aging of the oxygen sensor.

- Press arrow button.

continuation

If specification in display zone 3 or 4 is not obtained:

- Perform test drive to free oxygen sensors from any possible residues and repeat test.

If specified value in display zone 3 or 4 is not obtained, after a test drive has been performed:

- Replace relevant oxygen sensor before catalytic converter.