CHECK CURRENT DATA.

1) Start the engine.

2) Read the data of rear oxygen sensor heater current using the Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

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

• General scan tool

For detailed operation procedure, refer to the general scan tool operation manual.

QUESTION

Is the current 0.2 A or more?

Yes No

Repair the connector.

NOTE:

In this case, repair the following item:

• Poor contact of the rear oxygen sensor connector

• Poor contact in rear oxygen sensor connecting harness connector

• Poor contact in ECM connector