Check Engine Light Due to Failed Oxygen Sensor Heater on Toyota 4Runner

The heater circuit for the oxygen sensor tends to have a higher than normal failure rate. Failure of the oxygen sensor heater circuit will illuminate the Check Engine Light. The internal oxygen sensor heater cannot be repaired, the failed sensor should be replaced to correct this concern.


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Average mileage: 144,750 (107,000–190,000)
5 model years affected: 1998, 1999, 2000, 2001, more2002
10 people reported this problem
0 people shared problem details
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