My Dakota smells rich what O2 would cause this upper or lower O2 I’m not showing any codes but I’m telling you its rich my 2.5L engine has only two O2 an upper and a lower O2.
I’m guessing the lower O2 is the culprit I don’t know if any of the O2 have been changed I know I have not done so but I had a new cat and muff installed back 4 years ago so they may have replaced the lower one next to the cat.
Oh and my Dakota is 12 years old.........
9/11
I’m guessing the lower O2 is the culprit I don’t know if any of the O2 have been changed I know I have not done so but I had a new cat and muff installed back 4 years ago so they may have replaced the lower one next to the cat.
Oh and my Dakota is 12 years old.........
9/11 
Veteran
My guess would also be the lower because after the cat it should be picking up the excess amount off fuel in the exhaust stream
not real bad but I do go through gas more than usual it seems like I don’t really keep tract
But the gas smell is way bad on startup
But the gas smell is way bad on startup
Champion
its going to be no matter what since its not wamred up and the pcm dumps more fuel in than it needs. unless its smells like your sniffing straight gasoline.
Even if still hot it will be rich like that I have been doing a lot of work on my old gal Dakota so testing new brakes come back park maybe 15 minutes jump back in and go but strong gas smell
O2 are cheap correct so should I get an upper or lower?
What is a good O2 brand quality build?
What is a good O2 brand quality build?
