Checking lambda probe ageing of lambda probe upstream of catalytic converter — AUDI

AMM AMX ASM BDV
Special tools and workshop equipment required

V.A.G 1788/10 speedometer

VAS 5051 with VAS 5051/1

or

V.A.G 1551 with V.A.G 1551/3 A

Test requirements:

Coolant temperature at least 80 °C=> display group 004, display zone 3.

Test sequence

Connect vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01 => Page
01-3
For this purpose, the engine must be running at idle speed.

Rapid data transfer
HELP
Select function XX
Indicated on display

Enter "04" to select "Start basic setting" and confirm with Q key.

Basic setting
Q
Enter display group number XXX
Indicated on display

Enter "034" for "display group number 034" and confirm entry with Q key.

System in basic setting 34
⇒
1
2
3
4
Indicated on display

Set engine speed to 1000...2400 rpm using engine speed controller V.A.G 1788/10.
Check specified value in display zone 4:

Note:

This process can take a few minutes.

Display zones
1 · 2 · 3 · 4
Display group 034: Diagnosis of lambda probe ageing, lambda probe upstream of catalytic converter (bank 1)
Display · xxxx rpm · xxx °C · x.x s · ---
Display · Engine speed · Exhaust gas temperature · Period / Lambda probe upstream of / catalytic converter · Diagnosis status
Range · 670...6800 · 70...850 °C · 0...3.0 s · Test OFF / Test ON / B1-P1 OK / B1-P1 NOK
Specified value · 1000...2400 rpm · greater than 380 °C · 0.1...1.8 s · B1-P1 OK
Note: · If specified value is not achieved replace the lambda probe 1 upstream of catalytic converter (Bank 1)

Note on display zone 2:

Calculated value from engine speed and load.

Note on display zones 3 and 4:

The period specifies the time between two voltage jumps in the lambda probe (e.g. rich - lean - rich) thereby providing a measurement basis for the ageing status of the lambda probe. If the specified time is exceeded, display zone 4 indicates = B1-P1 NOK.

Press Ckey.

Basic setting
Q
Enter display group number XXX
Indicated on display

Enter "035" for "display group number 035" and confirm entry with Q key.

System in basic setting 35
⇒
1
2
3
4
Indicated on display

Check specified value in display zone 4:

Note:

If the test result "OK" is shown immediately after selecting the display group the test has already been completed.

Display zones
1 · 2 · 3 · 4
Display group 035: Diagnosis of lambda probe ageing, lambda probe upstream of catalytic converter (bank 2)
Display · xxxx rpm · xxx °C · x.x s · ---
Display · Engine speed · Exhaust gas temperature · Period / Lambda probe upstream of / catalytic converter · Diagnosis status
Range · 670...6800 · 70...850 °C · 0...3.0 s · Test OFF / Test ON / B1-P1 OK / B1-P1 NOK
Specified value · 1000...2400 rpm · greater than 380 °C · 0.1...1.8 s · B1-P1 OK
Note: · If specified value is not achieved replace the lambda probe 1 upstream of catalytic converter (Bank 2)