Condition for fault identification

Test condition:

The fault is recognized when attenuation of the amplitude ratio rises above 0.9

Potential problem source(s):

• Oxygen sensor before catalytic converter defective
• Oxygen sensor behind catalytic converter defective
• Defect in wiring harness to oxygen sensor behind catalytic converter

Terminal condition: Terminal 15

Voltage condition:

• None

Temperature condition:

• Engine temperature > 85 °C

Time condition:

• None

Other conditions:

• Drive at 50 - 80 km/h and moderate RPM
• No additional diagnostic fault codes logged