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Old 07-21-2012, 06:49 PM   #1
avionator
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Default p0420, o2 sensor new, maybe bad cat, aftermarket manifold?

anybody have any good leads on where to get a replacement exhaust manifold on a stock 2.5i 2009? My cat may be bad (rattle at 2.5-3k rpm under slight throttle... maybe falling apart?), and i prefer to do the work myself rather than let somebody charge WAY too much. I've been searching all morning and can find almost NOTHING for non-turbo models.

do i have to get headers and retrofit some sort of cat onto the end and extend the 02 and a/f wires? is there an aftermarket OEM design manifold? can i get an oem manifold from other than the dealer?


car has 67K on it, btw. to early for a cat to fail, imho.


thanks all.
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Old 07-21-2012, 08:15 PM   #2
Angry Outcast
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If you are under the 8 year 80,000 mile mark then the manufacturer is required to replace the converter free of charge. Its one of the few things the epa did right. I only know this cause I work at an exhaust shop for almost 10 years.
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Old 07-21-2012, 08:52 PM   #3
RaceFaceXC
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That rattle is more likely a loose heat shield. I would investigate that before you spend $ on parts. The easiest way is to look for broken/missing fasteners our just remove them and go for a short drive and see if you can recreate the sound. I would advise reinstalling them if you remove them
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Old 07-21-2012, 09:56 PM   #4
avionator
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Quote:
Originally Posted by Angry Outcast View Post
If you are under the 8 year 80,000 mile mark then the manufacturer is required to replace the converter free of charge. Its one of the few things the epa did right. I only know this cause I work at an exhaust shop for almost 10 years.
is this something that any car place would take care of, or should i go through the dealership?

i've checked for loose heat shield stuff, but haven't actually removed them. got under the car and couldn't find anything loose.
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Old 07-21-2012, 10:54 PM   #5
J.Gibbs
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Quote:
Originally Posted by avionator

is this something that any car place would take care of, or should i go through the dealership?
Dealer
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Old 07-22-2012, 01:39 AM   #6
Angry Outcast
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J.Gibbs is correct, it has to be taken care of through a dealer.
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Old 08-13-2012, 02:26 AM   #7
avionator
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turns out it was a software issue, but the noise is a bad rod knock. software fix turned off the CEL, but it's back on again... sooo gotta bring it back to the dealer. They told me about $5000 to fix the engine. Makes me want to just get a new one! Anybody putting any fun swaps into the 2009 era impreza? Or is it just easier to swap in the same engine?
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Old 08-13-2012, 04:54 AM   #8
Bababou
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If your able to do the work I would think you could build a REALLY fun NA motor for under 5K. Cams, head work, upgraded internals. Add a fuel pump and better injectors and a tune might get in the low to mid 200hp range.
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Old 08-13-2012, 06:00 AM   #9
RaceFaceXC
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You could do an ej257 swap for that kind of $
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