#1630014 - 12/03/08 06:25 PM
P0420 Catalyst System Efficiency Below Threshold
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Over the Hill
Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
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So, about 1200 miles after the installation of the Shark plenum, I get a CEL. I don't suppose I can blame that on the plenum.
I used my scanner to reset the light, but when it comes back, what should I try first, O2 sensors, cat, or both?
_________________________
1997 Grand Marquis - Started out life as a rental car in Milwaukee.
Mods:
Functional oil pressure gauge
Shark Plenum + Aviator throttle body
Headlight wiring
"Life after death is as improbable as sex after marriage!"
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#1630086 - 12/03/08 07:47 PM
Re: P0420 Catalyst System Efficiency Below Threshold
[Re: TechnoWeenie]
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less is moreŠ
Poobah
Registered: 08/30/04
Posts: 6320
Loc: Moses Lake, Wa
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Try O2s first, they are the cheapest and may be it if they have many miles on them.
_________________________
-Colton STRENGTH THROUGH HARMONY HARMONY THROUGH FRIENDSHIP EQUESTRIA PREVAILS  2004 Ford Crown Victoria LX - 65k "Tank"
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#1630798 - 12/04/08 07:42 PM
Re: P0420 Catalyst System Efficiency Below Threshold
[Re: Colt45]
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Member
Registered: 10/28/08
Posts: 410
Loc: North Florida
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Try O2s first, they are the cheapest and may be it if they have many miles on them. X2, the o2 sensors are cheaper and with higher mileage they do go bad or at least get "slow". repalce the sensors, clear the code and go from there. But in my experience it is usually the cat. converters
Edited by cfrank (12/04/08 07:43 PM)
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#1632629 - 12/07/08 01:53 PM
Re: P0420 Catalyst System Efficiency Below Threshold
[Re: cfrank]
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Poobah
Registered: 10/03/04
Posts: 7417
Loc: Memphis, TN 38002, USA, Earth,...
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  Blindly throwing part$ at a CEL is the least effective and most expensive thing you can do. If the cat is bad, then the HO2S is GOOD because it's accurately reporting the problem. If the HO2S is bad (reporting a nonexistent fault), then cat is GOOD. Find out what's actually WRONG before buying ANYTHING.
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#1667434 - 01/19/09 10:25 AM
Re: P0420 Catalyst System Efficiency Below Threshold
[Re: Steve83]
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Over the Hill
Registered: 09/20/08
Posts: 2174
Loc: Englewood,Florida
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I just got this code today, I had glasspacks installed about 3 hours ago, and I installed the shark plenum about a month ago.
Help!
_________________________
1998 White Crown Victoria Police interceptor.
setina pb-400 push bar, 75mm throttle body, 45$ granatelli plenum,1/2 intake spacer, home-made cold air intake, 20%tint, cherrybomb glasspacks
Oh come on man. You got no lady fingers, fuzz buttles, snicker bombs, church burners, finger blasters, gut busters, zippity do das, or crap flappers?
No, I don't.
You're gonna stand there, owning a fireworks stand, and tell me you don't have no whistling bungholes, no spleen spliters, whisker biscuits, honkey lighters, hoosker doos, hoosker donts, cherry bombs, nipsy daisers, with or without the scooter stick, or one single whistling kitty chaser?
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Registered: 12/28/09
Posts: 322
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