CHECK REAR OXYGEN SENSOR VOLTAGE.

1) Warm-up the engine until engine coolant temperature is above 70°C (158°F), and rapidly reduce the engine speed from 3,000 rpm.

2) Read the voltage of rear oxygen (A/F) sensor signal using Subaru Select Monitor.

NOTE:

• For MT model, depress the clutch pedal.

• Subaru Select Monitor

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

QUESTION

Is the voltage 250 mV or less?

Yes No

Contact the SUBARU distributor service.

NOTE:

The probable cause is considered as the deterioration of multiple parts.