Aging Check

Oxygen Sensor Aging, Oxygen Sensor Before Catalytic Converter, Checking

Special Tools and Equipment







- VAG1788/10 RPM adjuster







- VAS5051 with VAG5051/1

Test requirement:
- Coolant Temperature at least 80 °C.


Test sequence
- Connect VAS5051 tester and select vehicle system "01 - Engine electronics". Engine must run at idle for this. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAS 5051 Tester, Connecting and Selecting Functions"








Display on VAS5051:
- In selection -1-, click on the diagnostic function "04 - Basic setting".







Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "034" in button field -2- for "display group number 034" and press Q button to confirm input.
- Use VAG1788/10 RPM adjuster to adjust engine speed to between 2300 and 2800 RPM.







Display on VAS5051:
- Check specified value in display field -4-.


NOTE: This process can take a few minutes.

Display Group 034:

Continuation
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-