I built a heat shield for my intake on thursday, and last night my CEL came on, i took it to Autozone, and had them pull the code which was:

P421

I had this same code when i first put my actual intake on, but i reset the ECU and it went away. I don't want to reset the ECU again, incase there is actually something wrong.

Anyone have any ideas?

thanks

 

also as a side note. Autozone are about as helpful as a blind, seeing eye dog.

 

I believe there is a TSB for this code. take it to the dealer they will put a new catalitic converter. under warranty

 

yeh but when they see my new intake wont they deny me?

and i got a $100 deductible on the warranty, so wouldnt i have to pay?

 

P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)

brokeazzlos is right, there's a TSB for this code and they will fix it for free regardless of your mods. I suggest searching for this on the forum. As far as I remember people had a lot of problems after Mitsu 'fixed' that code.

 

they shouldnt, they know they got a problem, so more than likely it will not matter.
I worked for mitsu I did many of them with cars with intakes

 

yeh i searched for P0421 but found zip on the forum.

is there anything actually wrong with the car then? i just reset the ECU and its gone.

 

https://www.evolutionm.net/forums/se...archid=2910412

 

thanks mate.

 

wow thats alot. when i searched i got jack crap. thats pretty wierd

ok sorry for asking an already discussed question. lol.

my computer is a tard

 

the cat is bad.
mitsu will reflash your PCM and replace the cat.
you shouldnt reset the light, mitsu has to see it on for them to replace it.

 

oh, crap, so what types of problems did people have after the fix do you know?

 

https://www.evolutionm.net/forums/se...archid=2910412

 

If we were still doing Gurus, I think Greg might be approaching that status.

 

that link isnt working, it just says "sorry no matches"
this computer is retarted the search function isnt working properly on the site.
have you got any links directly to threads?