420 code after header install
#1
Staging Lane
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Join Date: Apr 2005
Location: Homestead, Florida
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420 code after header install
After having my Kooks headers and catted Y installed I threw a code 420
Cat system 1 Bank 1 efficiency below threshold. I am thinking this is due to running rich? I do not think the new cat is bad. I probably need a tune? What do you guys think. Thanks
Cat system 1 Bank 1 efficiency below threshold. I am thinking this is due to running rich? I do not think the new cat is bad. I probably need a tune? What do you guys think. Thanks
#3
Staging Lane
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Originally Posted by foff667
this happens on occassion with high flow cats not located in the stock position...you'll probably end up needing sims or to turn the code off.
#4
Launching!
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It's the same code folks get when they gut their stock cats,like me.I had to get rear o2 sims.The air is flowing thru the cat to fast.The PCM thinks the cat is bad.It richened my car also.Now i have Longtubes,front o2s ok,rears still have sims and no cats..