Oxygen Sensor: Testing and Inspection

TESTING LAMBDA SENSOR OPERATION

(Short test)

Prerequisites:
- Engine at operating temperature
- Idle speed correctly set




1. Connect exhaust tester at bleed nozzle in engine compartment.




2. Detach lambda sensor plug connection, wait for thermal equilibrium, and no CO value.




3. Pull off negative pressure line from fuel pressure regulator and close with suitable plug.
The CO value should rise significantly.
4. Reconnect plug on lambda sensor. The CO value should adjust itself to the control value of 0.6 ± 0.2%.
If there is no change in the CO level, there is a defect in the lambda sensor or in the DEE control unit.