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Old 01-31-2017, 10:56 AM   #1
airboss20
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O2 sensor multiple failures

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?
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Old 02-07-2017, 07:04 PM   #2
fourwd1
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Re: O2 sensor multiple failures

Never heard of that before.
You replace in the winter and it's OK until next winter?
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Old 02-07-2017, 07:17 PM   #3
airboss20
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Re: O2 sensor multiple failures

Yes sir. About this time every year. The sensor doesn't even have time to corrode.
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Old 02-07-2017, 08:29 PM   #4
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Re: O2 sensor multiple failures

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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84 4Runner - ARBed 5.29s F&R, 4.7 & 2.28 t-cases, Chevys, AP x-over, BudBuilt x-member, 2" drv trn lift, 36" TSLs, 30 spline Longs

80 something p/u - Buick 231 V6/TH-350 trans, Holley 4 bbl, Weiand intake, dual batts, dual tanks ...

89 4Runner - stock

2000 Isuzu Trooper + 2010 Sonata
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