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Author Topic: code p0420 and p0430 9cobrasvt8 ¯ Member # 11078 posted                              I have a 98 cobra with these codes, is it because im running a offroad xpipe? Thanks -------------------- 2013 Grabber blue coyote 1996 cobra 1996 gt h/c/i and gears 1998 cobra vert 1998 gt h/c/i 1997 gt blown Posts: 1519 | From: under the hood | Registered: Jul 2011  |  : Tom Renzo ¯ Member # 13165 posted                              Cat codes right and left. I guess you removed them and the O2 sensors set the cat efficiency codes. Have the rear O2 sensors tuned out. -------------------- I spend money i don't have. Building cars i don't need. To impress people i don't know. Posts: 557 | From: CT | Registered: Sep 2013  |  : WILDMAN97 ¯ Member # 9138 posted                              If you don't have a tuner, grab two spark plug non-foulers from the parts store. Screw them in your pipe then the o2 in to them. The codes will go away. You only need to do this for the rear o2's. http://poisnus.com/files/Spark%20Plug%20Non%20Fouler%20Mil%20Elims/mil%20elims%20spark%20plug%20fowlers_files/image012.jpg [ 2014-06-10, 07:40 PM: Message edited by: WILDMAN97 ] Posts: 260 | From: Modesto | Registered: Apr 2009  |  : Tom Renzo ¯ Member # 13165 posted                              Just curious how does that make the rear O2 see stored OXYGEN??? Personally i can not see how this would work. Because the O2 determines CAT efficiency by not seeing excessive oxygen telling the ECM the cats are storing it. Need more info on this?? For index-ratio and switch-ratio monitors, the converter is generally said to be degraded, if the rear-to-front switching ratio approaches about 70% So how does those extenders change then oxygen content it reads or does not read. I am very curious to how and why this would be. Thanks [ 2014-06-11, 04:07 AM: Message edited by: Tom Renzo ] -------------------- I spend money i don't have. Building cars i don't need. To impress people i don't know. Posts: 557 | From: CT | Registered: Sep 2013  |  : WILDMAN97 ¯ Member # 9138 posted                              The downstream O2 sensor monitors the gases coming out of the converter to make sure that the converter is doing its job. By moving the o2 out of the direct exhaust stream it will not read all the gasses that were not burned by the cat. It will only get a portion of it and not set off the code. It worked for me, I ran my 97 Cobra this way and no CEL or Codes. Posts: 260 | From: Modesto | Registered: Apr 2009  |  : 9cobrasvt8 ¯ Member # 11078 posted                              Thanks guys -------------------- 2013 Grabber blue coyote 1996 cobra 1996 gt h/c/i and gears 1998 cobra vert 1998 gt h/c/i 1997 gt blown Posts: 1519 | From: under the hood | Registered: Jul 2011  |  : 9cobrasvt8 ¯ Member # 11078 posted                              Where can i buy these? Oreilly doesnt have any that are long enough -------------------- 2013 Grabber blue coyote 1996 cobra 1996 gt h/c/i and gears 1998 cobra vert 1998 gt h/c/i 1997 gt blown Posts: 1519 | From: under the hood | Registered: Jul 2011  |  : WILDMAN97 ¯ Member # 9138 posted                              I got mine from Autozone. Posts: 260 | From: Modesto | Registered: Apr 2009  |  :

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