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#1630014 - 12/03/08 06:25 PM P0420 Catalyst System Efficiency Below Threshold
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
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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#1630076 - 12/03/08 07:39 PM Re: P0420 Catalyst System Efficiency Below Threshold [Re: Timmn1]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: UTL
Time to replace o2 sensors and cats
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#1630086 - 12/03/08 07:47 PM Re: P0420 Catalyst System Efficiency Below Threshold [Re: TechnoWeenie]
Colt45 Offline
less is moreŠ
Poobah

Registered: 08/30/04
Posts: 6359
Loc: Moses Lake, Wa
Try O2s first, they are the cheapest and may be it if they have many miles on them.
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2004 Ford Crown Vic LX, 72k "Tank"
2002 Ford Crown Vic PI, 159k "Highwayman" (Ex-Kootenai County, ID Unit #42)

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#1630798 - 12/04/08 07:42 PM Re: P0420 Catalyst System Efficiency Below Threshold [Re: Colt45]
cfrank Offline
Member

Registered: 10/28/08
Posts: 410
Loc: North Florida
 Originally Posted By: Colt45
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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2000 Ford Crown Victoria P71 - Ex jacksonville,Fl PD unit# 160

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#1632629 - 12/07/08 01:53 PM Re: P0420 Catalyst System Efficiency Below Threshold [Re: cfrank]
Steve83 Offline
Poobah

Registered: 10/03/04
Posts: 7445
Loc: Memphis, TN 38002, USA, Earth,...


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]
craftsmanracer Offline
Over the Hill

Registered: 09/20/08
Posts: 2174
Loc: Englewood,Florida
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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