Car Problem Reports

Toyota 4Runner Oxygen Sensor Heater May Fail

Toyota 4Runner Problem
9 Reports
Me Too

Model Years Affected: 1998, 1999, 2000, 2001, 2002

Average Mileage: 144,750 mi (107,000 mi - 190,000 mi)


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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