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Re: Getting -1.75 volts on the O2 sensor wire key off
Posted to Technical Discussion Forum on 5/20/2011

Robert, if your ECM isn't adequately grounded, then an 02 sensor, firmly screwed into the exhaust manifold, which probably IS well grounded, could APPEAR to be generating a negative voltage.

Voltage drop your ECM ground. + lead on the battery negative termin... Login to read more.