Fault description

Diagnosis monitors the internal resistance of the oxygen sensor after catalytic converter.

The fault is detected when the internal resistance of the oxygen sensor after catalytic converter is greater than 5000 Ohm.

Possible fault cause:

• Contact resistance in connector of oxygen sensor
• Oxygen sensor after catalytic converter cooled down too much due to external influence (e.g. icing)
• Wiring harness of oxygen sensor after catalytic converter defective
• Oxygen sensor after catalytic converter defective (heater defective)