Oxygen Sensor (O2S) Before Three Way Catalytic Converter (TWC), Checking

Oxygen Sensor (O2S) Before Three Way Catalytic Converter (TWC), Checking

Special tools and workshop equipment required







- VAS 5051 Vehicle diagnostic, testing and information system
- VAS 5051/1 Adapter

Requirements
- Coolant temperature at least 80 degrees C.

Work sequence
- Connect vehicle diagnostic, testing and information system VAS 5051 and select vehicle system "01 -Engine electronics" in selection. Engine must be run at idle.







Display on VAS 5051:
- Under -1- select diagnostic function "04 - Basic setting".







Display on VAS 5051:
1 - Enter display group
- Enter "034" for "display group number 034" in field -2- and confirm entry by pressing -Q- button.







Display on VAS 5051:
- Activate basic setting by pressing -A- button.
- Press accelerator and brake pedal simultaneously, engine speed increases to approx. 2300 rpm.

Conditions
- Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2300 rpm.
- Check indication in display groups -3- and -4-.







Note on display fields 3 and 4:
The dynamics factor is the characteristic for the aging of the Oxygen Sensor (O2S). The lower the dynamics factor the more advanced is the aging of the Oxygen Sensor (O2S).
(Cont.)

If specification in display field 3 or 4 is not obtained:
- Perform test drive to free Oxygen Sensor (O2S) from any possible residues and repeat test.

If specified value in display field 3 or 4 is not obtained, even after a test drive has been performed:
- Replace Oxygen Sensor (O2S) 1 before Three Way Catalytic Converter (TWC).