I just Magnaflow cats installed on an 04 Hemi..... The check enigine light came on a couple of hours later. I took the battery cable off and it reset the light but it came back on in a few hours again..... Does anyone have an idea why this is happening? Also I have 2-- 3" 40 seris flows.

 

First things first, what code do you have? If you don't know how to retrieve the codes, do a quick search. You will see that you use the key to retrieve the codes. I can't remember exactly but I think it is on-off 5 times and leave it turned on number time. If you search you'll see what I mean.

When you get the code, feel free to post it and we'll help you.

 

MY check engine light flashed 10 times whats that mean?

 

If it flashes and doesnt go out that means that you need to get it fixed, if it flashes and goes off then you just reset the computer to a different setting.


In the 02s you turn the key on and off 3 times and leave it on after the third.....dont start the truck tho....

 

Ok... I got it checked out.... it was my o2 sensor on the driver side before the cat. I replaced it by the way it was only 26 bucks from the dodge dealership. I pulled the battery cable off to reset everything but after a few hours it still came back on?????

 

hey man

did they run all new piping from exhaust manifolds back if they did you need an o2 sensor relocater

 

Naw... The O2's are in the same place... ???

 

So what was the code? Did you just bring it to an auto parts store and have them scan it? Did you notice any problems with the wiring?

 

I took it to a mechanic that I know. He used a Snap On computer. Not sure what the code was but it said the front O2 wasnt readin. After I replaced it.... It was readin but the light is still comin on.