Oxygen Sensor Heater May Fail on Toyota 4Runner
Problem overview
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.
13 people reported this problem
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Toyota 4Runner vehicles with this problem
Average mileage: 144,750 miles
(107,000 - 190,000)
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