Contents

			Test results
1	COMPONENT CONCERNED	ELECTRICAL CONNECTION CHECK FOR THE OXYGEN SENSOR AND THE POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Connections on oxygen sensor and Powertrain Control Module	Check for loose electrical connections at the sensor connector and at the Powertrain Control Module.	Go to Step 2	Presence of loose electrical connections.	Restore the correct continuity for the wiring.
2	COMPONENT CONCERNED	WIRING CONTINUITY CHECK BETWEEN OXYGEN SENSOR AND POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between oxygen sensor and Powertrain Control Module	Check for breaks in the continuity of the wiring between the oxygen sensor and the Powertrain Control Module caused by oxidised or corroded terminals.	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	COMPONENT CONCERNED	WIRING INSULATION CHECK BETWEEN OXYGEN SENSOR AND POWERTRAIN CONTROL MODULE	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between oxygen sensor and Powertrain Control Module	Check the insulation condition of the wiring between oxygen sensor and Powertrain Control Module	Go to Step 4	Wiring insulation faulty.	Restore correct wiring insulation.
4	COMPONENT CONCERNED	OXYGEN SENSOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Upstream oxygen sensor	Check that the upstream oxygen sensor is working properly See Test 1080BA Check on the operation of the upstream Lambda sensor	End of diagnosis	Oxygen sensor not working properly.	Replace the upstream oxygen sensor Op. 1080B94 FRONT LAMBDA SENSOR TO WITH CATALYTIC CONVERTER - R.R