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Re: Downstream O2s 0 volts, No CEL, only history P0420
Posted to Technical Discussion Forum on 11/1/2016

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hey mike, get some carb cleaner and spray in the intake. if the o2 is working it will momentarily read from 7 to 900 on the scan tool. this will affect both rear o2 sensors. a snap throttle will do t... Login to read more.