Oxygen Sensor 1 Aging Check

Special tools and equipment
- Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3







- VAG 1788/10 Engine speed adjuster

Test conditions
- Coolant temperature must be at least 80 °C, See display group 04, display zone 3.

Functional check
- Connect scan tool VAG 1551 (VAG 1552). Start engine and select "Address word" 01 of engine control module. When doing this the engine must be running at idling speed.

(Connecting scan tool and selecting engine control module). Refer to "VAG 1551 Scan Tool" [1][2][3][4][5]Connecting VAG 1551 Scan Tool

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

Indicated on display:


Basic setting
Input display group number XXX


- Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.

Indicated on display: (1-4 = Display zones)


System in basic setting 34 ->
1 2 3 4


- Set engine speed to 1800 - 2200 RPM using speed regulator VAG 1788/10:
- Maintain the engine speed at 1800 - 2200 RPM until the display in display zone 4 jumps from "Test OFF" to "Test ON".
- The catalyst temperature in display zone 2 must be 350-500 °C
- Check cycle duration in display zone 3:
Specification: maximum 1.0 s
- Continue to maintain the speed at 2200 - 2800 RPM until the specification "B1-S1 OK" appears in display zone 4.

If the specifications are obtained:
- Press -> key.
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch off ignition.

If the specifications are not attained:
- Carry out a road test to free Oxygen sensor of possible residues and repeat the test.

Observe the valid safety precautions when carrying out a road test. Technician Safety Information

If the specifications are again not attained:
- Replace Oxygen sensor (G39).