Davojan59

the front O2 sensors are the ones that monitor the air/fuel ratio, so turning off the rear ones wont make a difference. Check ur front ones before u do anything else.

bb 460

you just put on those mods and the light came on cause you're putting more air in the engine meaning you have to put more fuel in as well. if your fuel pump was weak before it's going to show up even more. like was said before, mass air, vacuum leak cause you had to swap things like that when you put that stuff on.

znasrah

all the 02's should be turned off... but i'll check the vaccum leak