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O2 sensor multiple failures


airboss20
01-31-2017, 10:56 AM
I have repeatedly replaced the B2S2 O2 sensor on my Tundra 4.7L. I have used the OEM, Cheapos and Bosch sensors over the last 3 years. Every winter I get a "Sensor heater circuit failure" code.

ideas?

fourwd1
02-07-2017, 07:04 PM
Never heard of that before.
You replace in the winter and it's OK until next winter?

airboss20
02-07-2017, 07:17 PM
Yes sir. About this time every year. The sensor doesn't even have time to corrode.

fourwd1
02-07-2017, 08:29 PM
have you checked the 'bad' O2 sensor to see if the heater is actually bad?
I'm guessing the resistance could be checked with a DMM.
The FSM would say for sure how to test it.
Maybe the ECM is supplying too high a voltage to that sensor, killing it?

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