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Re: '99 avalon 3.0 upper O2's read constant 3.3V
Posted to Technical Discussion Forum on 12/2/2015 1 Reply

look in the Denso catalog online and make sure you got the correct AFR sensor (not o2) and replace both of them. Voltage on AFR+ and AFL+ should be 3.3 ; voltage on AFR- and AFL- should be 3.0

AFR sensors don't change voltage, and using cheap wrong sensors w... Login to read more.

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