Test results 1 COMPONENT CONCERNED OXYGEN SENSOR CHECK OK (NO FAULTS DETECTED) FAULT DETECTED OPERATION Oxygen sensor wiring Check the continuity/insulation of the wiring between sensor heater coil and engine management control unit Go to Step 2 Wiring defective Restore the correct wiring 2 COMPONENT CONCERNED OXYGEN SENSOR CHECK OK (NO FAULTS DETECTED) FAULT DETECTED OPERATION Oxygen sensor wiring Check that the sensor heater coil power supply is correct Go to Step 3 Power supply not correct Restore correct power supply 3 COMPONENT CONCERNED OXYGEN SENSOR CHECK OK (NO FAULTS DETECTED) FAULT DETECTED OPERATION Oxygen sensor Check that the sensor is working End of diagnosis Oxygen sensor faulty Replace the oxygen sensorOp. 1080B90 LAMBDA SENSOR - R.R.