Condition for fault identification

Test condition:

The fault is recognized when the oxygen sensor before the catalytic converter fails to achieve the specified operating temperature although the heater is operating.

Potential problem source(s):

• Defective wiring harness
• Oxygen sensor before catalytic converter defective

Terminal condition: none

Voltage condition:

• Onboard electrical system voltage between 9 V and 16 V

Temperature condition:

• Engine warmed to normal temp, above 80 °C

Time condition:

• 2 min. after engine start

Other conditions:

• Engine ON