Checking Oxygen Sensor Aging

OXYGEN SENSOR AGING, CHECKING (BEFORE THREE WAY CATALYTIC CONVERTER)

Special tools, testers and auxiliary items
- VAG 1551/1552 scan tool with VAG 1551/3 adapter cable

Test conditions
- Coolant temperature at least 80 °C (176 °F)

Functional check
- Engine running at idle

- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01. Refer to "On-Board Diagnostics II With VAG 1551". Testing and Inspection

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Indicated on display


Basic Setting HELP
Input display group number XXX

- Press buttons -1-, -3- and -0- to input display group 130 and press -Q- button to confirm input.

Indicated on display (1-4 = Display fields)

System in Basic Setting 130 ->
1 2 3 4

- Increase engine speed to 2200-2800 RPM and check the specifications for O2S aging (before three way catalytic converter) in display fields 1-4.

NOTE: During the test, engine RPM must be held for at least 7 minute so that exhaust gas temperature is within specification range. Observe O2S control status in display field 4.





- Press -C- button.
- Press buttons -1-, -3- and -1- to input display group 131 and press -Q- button to confirm input.

Indicated on display (1-4 = Display fields)

System in Basic Setting 131 ->
1 2 3 4

- Run engine at idle speed and check specifications.





Continuation

If specification is not attained:
- Carry out a road test to free HO2S of possible residues and repeat the test.

If the specification is again not attained:
- Replace HO2S -G39- (before three way catalytic converter).
- Read the readiness code. If DTC memory has been erased, repair must be verified via appropriate display group See Readiness code, creating. Refer to "On-Board Diagnostics II With VAG 1551". Testing and Inspection

Relevance of values in 8-digit number block