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
WIRING CONTINUITY CHECK
Oxygen sensor wiring
Check for breaks in the wiring continuity caused by oxidised or corroded terminals
Go to Step 3
Breaks in the wiring continuity.
Restore the correct continuity for the wiring.
3
WIRING INSULATION CHECK
Check the condition of the wiring insulation (check for inversion of signal leads or open circuit at signal leads).
Go to Step 4
Wiring insulation faulty.
Restore correct wiring insulation.
4
EARTH CONNECTION CHECK
Check the condition of the earth connections.
Go to Step 5
Restore the correct earth connections.
5
CHECK ON SEEPAGE IN EXHAUST MANIFOLD
Exhaust manifold
Check for the presence of any seepage in the exhaust manifold.
Go to Step 6
Seepage inside the exhaust manifold.
Restore correct operation
6
SENSOR CONDITION CHECK
Oxygen sensor
Check for the presence of any oil or oxidation on the sensitive element or impact to the sensor casing. Also check that it is correctly fitted.
Go to Step 7
Sensor fouled, contaminated or not correctly installed.
Clean the sensor or fit it correctly.
7
OXYGEN SENSOR OPERATION CHECK
Check that the oxygen sensor is working correctly
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