Preconditions for the test:
Engine running.
No faults stored.
Battery voltage above 11.5V.
Engine temperature above 80 °C.
All electrical loads switched off.
Gear selector set to ”P/N”.
No leaks in the exhaust system.
If cruise control is fitted, it must be working properly.
Note:
Used to test the lambda probe before the catalytic converter.
The basic setting procedure may take a few minutes.
Procedure:
Choose the function: Lambda probe before catalytic converter
Keep the engine speed between 2500 and 4000 rpm.
The diagnostic status field changes from ”Test off” to ”Test on”.
Maintain the engine speed until the diagnostic status field changes from ”Test on” to ”B1-S1 OK/ B1-S1 not OK”.