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chatch82
02-18-2010, 10:40 AM
Was driving to work this morning and popped a CEL. I scanned it when I got to work and the code was a P0420 Catalyst Threshold below efficiency. What does this mean?

I have a turbo back exhaust with no cat installed and thats it.
The Internet
02-18-2010, 10:44 AM
one of my fav sites:
http://www.obd-codes.com/p0420

It's a bit more descriptive than the code book.
Bu11dogg2
02-18-2010, 10:47 AM
It means that your catalytic is about to **** the bed :(

You can pick up a stock replacement set up pretty easily/cheaply

If your car is less than 8 years/80k miles it's covered under manfacturer warranty ;)
chatch82
02-18-2010, 10:52 AM
i am catless though
chatch82
02-18-2010, 10:53 AM
i just found a exhaust leak where the uppipe meets the turbo. i bet that is causing it. looks like someone snapped off an upipe stud!
Bu11dogg2
02-18-2010, 10:56 AM
that could do it
chatch82
02-18-2010, 11:07 AM
awesome........any suggestions on how to fix it?
Bu11dogg2
02-18-2010, 11:22 AM
not sure if you can re-stud the UP.

What UP is it? if it's the stock or an STi one just buy a used one, they're cheap and all over the place.

Invidia makes a pretty cheap one too!
chatch82
02-18-2010, 11:25 AM
yea i will probably just do that.........arent they a pain to install?
Bu11dogg2
02-18-2010, 11:37 AM
yes they are a PITA
legacygt
02-18-2010, 12:20 PM
yea i will probably just do that.........arent they a pain to install?


there not to bad...
mattminer
02-18-2010, 12:22 PM
if you have no cat, youll get that 420 code untill you are tuned.

M@
chatch82
02-18-2010, 03:57 PM
ok.......i still gotta get that leak fixed because im sure its efect the performance
shtbxr22
02-22-2010, 07:46 PM
there not to bad...


seriously?
downest
02-22-2010, 10:55 PM
Uppipe install isn't that bad, I almost always remove the turbo to do it, takes about two hours normally.
shtbxr22
02-23-2010, 07:30 AM
weird, I thought i was somewhat competent at my job. must not be, because every uppipe i've done is a pain in the balls. :(
BG @ BrenTuning
02-23-2010, 10:16 AM
you get rid of that code with a tune, it's normal.
downest
02-23-2010, 11:44 AM
weird, I thought i was somewhat competent at my job. must not be, because every uppipe i've done is a pain in the balls. :(



They can be, I've done it so many times I know all the right tools and tricks for when bolts and stuff get stuck. I think the worst thing is really the bolt that holds the DS bracket to the engine since it's a pain to get anything on there to get it loose.
SubyFr3ak
02-25-2010, 01:43 AM
They can be, I've done it so many times I know all the right tools and tricks for when bolts and stuff get stuck. I think the worst thing is really the bolt that holds the DS bracket to the engine since it's a pain to get anything on there to get it loose.

Note to self... have someone else do the PITA up pipe swap... that way I don't have to become too creative :D