Check output voltage of oxygen sensor during idling.


Warm up the oxygen sensor with the engine at 2,500 rpm for approximately 90 seconds. CHECK:

Using the OBD II scan tool or TOYOTA hand-held tester, read the output voltage of the oxygen sensor during idling.

Oxygen sensor output voltage:

Alternates repeatedly between approx. 0.4 V and approx. 0.55 V (See these table):


Perform confirmation driving pattern. (See page DI-41 )

Replace oxygen sensor.



Oxygen Sensor Circuit Slow Response

(Bank 1 Sensor 1)

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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