1st engine light on code po420 i replaced the 02 sensor now the car hesitates and like in the mornings and after sitting at work all day when i try to take off it sits there for a few seconds then takes off? also the mass air flow sensor gets gunky? when i step on the gas it kinda sounds like a vac leak? i was told the cad conv and the mass air flow sensor? i have alot of black smoke, burns oil, running real rich. also i could smell gas under the hood before replacing the 02 sensor now that smell of gas is gone under the hood but i feel like i smell it on me when i get out of the car? what all is wrong with my car and what should i do to fix it? thank you so very much
May 29, 2009 at 12:36 PM
