Contents

			Test results
1	COMPONENT CONCERNED	OXYGEN SENSOR AND POWERTRAIN CONTROL MODULE CONNECTION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Oxygen sensor and Powertrain Control Module connections	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
	Wiring between downstream oxygen sensor and Powertrain Control Module	Check for breaks on the wiring between downstream oxygen sensor and Powertrain Control Module	Go to Step 3	Breaks in the continuity of the wiring	Restore the correct continuity for the wiring
3	COMPONENT CONCERNED	DOWNSTREAM OXYGEN SENSOR WIRING INSULATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Wiring between downstream oxygen sensor and Powertrain Control Module	Check for short circuits to battery on the wiring between downstream oxygen sensor and Powertrain Control Module	Go to Step 4	Presence of short circuits to battery on the wiring	Restore the correct wiring insulation to battery
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