Fault description

Diagnosis monitors the signal voltage of the oxygen sensor 2 after catalytic converter in overrun mode.

The fault is detected when the voltage is greater than 5 0.151 V in overrun mode.

Possible fault cause:

• line disconnection;
• short circuit to B+, sensor stops (with help from a voltage source) at U > 0.2V;
• Sensor too cold in the overrun fuel cutoff (only possible in extreme situations)
• Impact through the catalyst in the case of critical fuel
• EGO sensor strongly altered