I need smart people help with my CEL P0420

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11-04-2011, 01:36 PM

#31

FXTbrah

previously known as wrxBRAH

iTrader: (17)

Join Date: Sep 2010

Location: San Jose / Campbell

Posts: 3,383

Car Info: 2004 FXT

catless w/ spacer checking in. if your rear 02 is good, this is a good alternative.

11-04-2011, 01:38 PM

#32

FXTbrah

previously known as wrxBRAH

iTrader: (17)

Join Date: Sep 2010

Location: San Jose / Campbell

Posts: 3,383

Car Info: 2004 FXT

Quote:

Originally Posted by Hoofus

No emissions where I live.
In any case, I have a stripped head stud hole? on my header on the passenger side, that could be causing a leak and why its throwing the error. Perhaps it would behoove me to have a shop tap the hole a bit bigger and place a larger bolt in there....

If you believe you have an air leak prior to the o2 sensors, youd be running rich and the code that would show up would be different. (probably 171 or 172).

11-07-2011, 09:22 AM

#33

Hoofus

Registered User

Join Date: Aug 2011

Location: USA

Posts: 487

Car Info: subaru legacy, 01 4eat

Quote:

Originally Posted by wrxBRAH

If you believe you have an air leak prior to the o2 sensors, youd be running rich and the code that would show up would be different. (probably 171 or 172).

But its intermittent, I hate problems that come and go as they please.
My gas mileage hasn't dropped crazily and there isn't any hesitation\foul smelling exhaust.

Oh well, if the op has gone this many years without issue I don't see why I'd be any different in regards to the cat, if I start to get hesitation I'll pick one up from summit.