Oxygen Sensor Aging

Oxygen Sensor (O2S) Aging (HO2S Before TWC), Checking

Special tools and equipment






- VAG1788/10 RPM adjuster






- VAS5051 with VAG5051/1

or

- VAG1551 with VAG1551/3B

Test requirement:
- Coolant temperature at least 80 degree C display group 4, display field 3.

Test sequence
- Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. Connecting VAS 5051/VAG1551 Scan Tool
Engine must run at idle for this.

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -4- to select "Initiate basic setting" and press -Q- button to confirm input.

Indicated on display:


System in Basic Setting Q
Input display group number XXX


- Press buttons -0-, -3- and -4- to select "display group number 034" and press -Q- button to confirm input.

Indicated on display:


System in Basic Setting 34 ->
1 2 3 4


- Use VAG1788/10 RPM adjuster to adjust engine speed to between 1800 and 2200 RPM.
- Continue test as soon as display 4 indicates "Test ON".

NOTE: This process can take a few minutes.

Display Group 034:

Continued
If specified value in display field 3 and 4 is not obtained:
- Road test vehicle in order to free oxygen sensor of possible residue and repeat test.

If specified value in display field 3 and 4 is not obtained, even after road test:
- Replace Heated Oxygen Sensor (HO2S) -G39-.