Contents

			Test results
1	COMPONENT CONCERNED	ELECTRICAL CONNECTIONS CHECK	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 connections.
2	COMPONENT CONCERNED	DOWNSTREAM OXYGEN SENSOR WIRING CONTINUITY CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Downstream oxygen sensor wiring	Check for continuity breaks on the wiring between oxygen sensor and pin 21 of the Powertrain Control Module due to oxidised or corroded terminals	Go to Step 3	Breaks in the wiring continuity.	Restore the correct continuity for the wiring.
3	COMPONENT CONCERNED	DOWNSTREAM OXYGEN SENSOR WIRING INSULATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Downstream oxygen sensor wiring	Check the integrity of the insulation in the wiring between oxygen sensor and pin 21 of the Powertrain Control Module (check signal cable reversal or open circuit on signal cables).	Go to Step 4	Wiring insulation faulty.	Restore correct wiring insulation.
4	COMPONENT CONCERNED	DOWNSTREAM OXYGEN SENSOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Downstream oxygen sensor	Check that the oxygen sensor is working correctly See Test 1080BD Check on the operation of the downstream Lambda sensor	End of diagnosis	Oxygen sensor not working properly.	Replace the downstream oxygen sensor Op. 1080B95 REAR LAMBDA SENSOR TO CATALYTIC CONVERTER - R.R