Oxygen Sensor Heater May Fail on Toyota 4Runner

Submitted by Vehicle Owner · May 29, 2025

Published by RepairPal

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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Schedule Repair

Toyota 4Runner vehicles with this problem

5 model years affected

Average mileage: 144,750 miles

(107,000 - 190,000)

Repairs related to this problem

Oxygen Sensor Replacement

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