Checking Lambda probe ageing Lambda probe 1 — VW

BFS
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3

Test prerequisites

Exhaust system between catalytic converter and cylinder head must be free of leaks
The signal from brake light switch and brake pedal switch must be OK,
Checking => page
24-162
.
Coolant temperature must be at least 80 °C, =>display group 100, display zone 2.
A minimum period of 120 seconds must have elapsed since starting engine, =>Display group 100, display zone 3

Functional check

Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit.
(Connecting fault reader and selecting engine control unit => page
01-11
).

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys 0 and 4 for function "Initiate basic setting" and confirm entry with Q key.

Basic setting
Input display group number XXX
Indicated on display:

Press keys 0, 3 and 0 for "Display group number 30" and confirm entry with Q key.

System in basic setting 30
⇒
1
2
Indicated on display:
(1...2 = display zones)

Check status of Lambda regulation before catalytic converter (display zone 1):
Specification: 1 1 1
(Significance => page
01-151
)

Raise the engine speed to 2500...4000 rpm until the Lambda probes are operationally ready (display zone 2):
Specification: 1 1 x
(Significance => page
01-151
)

Notes:

The first position in the 3 digit number block changes periodically between 0 and 1 (lambda probe heating on or off)
The third position in the 3 digit number block (display zone 2) is only set to 1 for part load/throttle and high exhaust temperatures.

If the specifications are not attained:

Interrogate fault memory => page
01-21
.

If the specifications are obtained:

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

System in basic setting 34
⇒
1
2
3
4
Indicated on display:
(1...4 = display zones)

Models ▸05.01

Raise engine revolutions to 2500...4000 rpm until display in display zone 4 jumps from "Test OFF" to "Test ON".

Models 05.01 ▸

Depress brake pedal and hold.
Depress accelerator down to full throttle position.

Engine speed will be increased by engine control unit to
approx. 3000 rpm.

When the diagnosis is initiated by the engine control unit, the display in display zone 4 jumps from "Test OFF" to "Test ON"

Continuation for all models:

Note:

This process can take several minutes. Depending on the control unit version the test will start in the range 100...400 °C (catalytic converter temperature) (display zone 2).

Leave engine running at increased speed until the result of short test is displayed in display zone 4:
Specification "B1 P1 OK."

If the specification is obtained:

Press the ⇒key.
Press keys 0 and 6 for function "End output" and confirm entry with the Q key.
Switch off ignition.

If the specification is not obtained:

Carry out a test drive to remove possible residue on Lambda probe and repeat check.

Observe the valid safety precautions when carrying out a road test => page
24-27
.

If the specifications are again not attained:

Replace Lambda probe (G39).
Erase learnt values and adapt engine control unit=> page
24-134