CHECK REAR OXYGEN SENSOR.

Measure the resistance between rear oxygen sensor terminals.

Terminals

No. 3 — No. 4

QUESTION

Is the resistance less than 1 Ω?

Yes No

Replace the rear oxygen sensor.

Even if the malfunction indicator light illuminates, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector may be the cause.