Dodge ram plenum repair, now missfires
Amateur
Joined: Mar 2012
Posts: 29
Likes: 0
From: Ontario, Canada
reason i posted that was.. the o2 sensor was likely bad already, and has been for a while (same goes for plug) so i dont think the o2 sensor is going to be the issue. though, it should obviously be replaced regardless :P
Champion
Joined: Aug 2009
Posts: 3,015
Likes: 8
From: Western NY,
and a bad 02 sensor can cause a vehicle to run rich which in turn leaves a sooty buildup on things like the cat and plugs.... which when left long enough will foul it up.