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Re: P0172, Mode 5, CAT EFF ?
Posted to Technical Theory Forum on 5/9/2007

Hey! After a few moments at idle the reading drops to about 0.080V and stays there till the engine is loaded again. ITs an 01 2.2L Auto trans, no oil consumption to my knowledge. I read that oil and coolant and oil additives are killing cats and 0-2 sensors. S... Login to read more.