Problem Description and Possible Solution
The Check Engine Light may illuminate because a component of the oxygen sensor stops working. As a result the engine computer is unable to determine the proper ratio of air to fuel for the engine. Replacing the failed oxygen sensor should correct this concern.
Average mileage: 101,352 (50,000–164,000)
30 people reported this problem
Car was not doing anything wrong. Check engine light came on. Took it to a shop. They changed the Mass Air Flow Sensor, for $300+. 24 hours later, check engine light comes on again. Take it back to the shop, figuring it has to do with the repair. They say, it's now the O2 Sensor. Car is still not acting funny, no way I'm going to pay anymore money. Took it so several shops since then, nobody can figure it out. Check engine light's been on 5 years now. Still doesn't act funny. Move to GA they require an emissions test, it fails for the O2 Sensor.
Bank2 sensor2 failed. Dealership diagnosed, but I took some where else to be fixed at half the cost. The light still comes on. We found a blown fuse and replaced it. The light went out and came back on. I had one of the Auto Parts store check it and it said Bank2 sensor2- high voltage.
Bad mileage noticed before the Check Engine light came on. Been on the shop off and on for 2 weeks. had all 4 sensors replaced. Car would barely go above 25 mph. Tons of hesitation. Horrible smell coming from engine area. (Mechanic says coolant) At the shop right now being fixed. Toyota MUST address this issue as it seems I have newer vehicle than some of you who have already posted and there is still a problem.