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Old 02-15-2007, 11:22 AM   #1
cMags
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Outback Sport CEL w/ code P0420 @ 48K

So just cruising the other day home from work, CEL pops on, get the code pulled, and it's P0420 - Cat efficiency below threshold. I've got no mods on the car as far as intake/engine/exhaust. Seems that there could be something wrong with the cat. The code went away the first time after a day, but then came back again after a few days (in the same spot on road ). Got it cleared (that's when I pulled the code), and it came back again the next day - not going away now.

I've got 48K on the odo, so I'm past the bumper-to-bumper, but was curious if the exhaust system is covered under drivetrain.

I was also told at the parts store that there's a federal regulation that requires cat's to be covered for 80K. Any truth to this?

Has anyone had this issue? Known problem that might cause this? Or should I just go the bad-cat route and call SOA for warranty work. Oh yea, will they charge me for a diagnostic or will they include that as well under the warranty if it is the cat? I haven't ever had warranty work done on any of my cars, so I'm not sure what to expect. I really don't want to have to pay the stealership their outrageous prices if I don't have to. I wouldn't bring it to them if it wasn't going to be covered under warranty to begin with...

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Old 02-15-2007, 12:09 PM   #2
SubeTek
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Cats are covered 8/80 federal emission warranty. Go to your dealer and have them repair the issue.
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Old 02-15-2007, 01:57 PM   #3
cMags
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Outback Sport

Ok, but what I'm worried about is it not being the cat and Subaru charging me for diagnostics and even worse, repairs - I typically do my own work, and if I can't handle it, I bring it to my mechanic to not get totally screwed by the dealership.

Does anyone know of any issues that could cause something like this, maybe spark plugs gapped incorrectly or something stupid like that? That and a replacement paper air filter really are the only things I've changed in the intake/engine/exhaust system...
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Old 02-15-2007, 05:43 PM   #4
blackfang
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Well then take it to your mechanic and pay for him to install it.

It is the Catalytic converter. Spark plugs wont cause this, the air filter won't either. It is the Cat itself and is covered under the 8/80,000 emissions warranty.
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Old 02-15-2007, 06:20 PM   #5
SoonerOrLater
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it is the cat. the only way for that code to appear is a bad cat. end of story. and its warantee. in the time i worked at subaru i encountered this code enough to know that it wont come on for any other reason.
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Old 02-15-2007, 10:30 PM   #6
finnRex
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Quote:
Originally Posted by blackfang View Post
It is the Catalytic converter. Spark plugs wont cause this, the air filter won't either. It is the Cat itself and is covered under the 8/80,000 emissions warranty.
+1 If it's a P0420 code, it will be the cat, which is covered under the 8/80k.



Mika
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Old 02-15-2007, 10:38 PM   #7
fasterthanrayswrx
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Would a bad sensor cause it too? And would that be covered?
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Old 02-15-2007, 10:47 PM   #8
02wrbrex
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Quote:
Originally Posted by blackfang View Post
Well then take it to your mechanic and pay for him to install it.

It is the Catalytic converter. Spark plugs wont cause this, the air filter won't either. It is the Cat itself and is covered under the 8/80,000 emissions warranty.
I had a PO420 on my gf's jetta because of bad plugs so it can be caused by plugs not firing and emitting gas and extra unburnt fuel which then gets burnt up in the hot cat. maybe there is something weird on Subarus that wont allow this to happen on them but its definately possible on VW's.
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Old 02-16-2007, 06:30 AM   #9
blackfang
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Well if that is the case, then you should also have a Misfire code and the CEL flashing too.

Then again we are talking Subaru and not VW which is a whole other story. Not all codes are exactly the same among different makes. However every single Subaru that has had just a p0420 code come in my dealership have all been the catalytic converter.
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Old 02-16-2007, 11:07 AM   #10
riSTI
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Check out this thread. Although I am by no means convinced that our recent extreme NE weather has anything to do with it, your not alone...

http://forums.nasioc.com/forums/show....php?t=1014758
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Old 02-16-2007, 11:07 AM   #11
RexyGirl
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Isn't Mass a California emissions state? Then, if it is an oxygen sensor, it should be covered....

Cat convertors, (if that is what failed) are covered for 8 year/80,000 miles.


UPDATE: Mass. is a California emission state. Anything related to the emissions is covered up until 50,000 miles. (the vehicle has to pass emissions up until that time)

Last edited by RexyGirl; 02-16-2007 at 11:20 AM.
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