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#1
01-31-2017, 11:56 AM
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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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#2
02-07-2017, 08:04 PM
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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?
__________________
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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#4
02-07-2017, 09:29 PM
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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?
__________________
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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