CHECK REAR OXYGEN SENSOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance between the rear oxygen sensor connector terminals.

Terminals

No. 2 — No. 4:

QUESTION

Is the resistance less than 30 Ω?

Yes No

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit of harness between rear oxygen sensor and ECM connector

Poor contact of the rear oxygen sensor connector

Poor contact in ECM connector

Poor contact of coupling connector

Replace the rear oxygen sensor.