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P0420 #1205668 03/04/05 11:59 PM
Joined: Feb 2003 Posts: 140 Pennsylvania 9 99_2.5_V6 OP CEG\'er
OP 99_2.5_V6 CEG\'er 9 Joined: Feb 2003 Posts: 140 Pennsylvania	My CEL came on and I got it scanned at AutoZone and received code P0420. I searched and I guess I take it to the dealership! I also found the TSB below. Make : MERCURY Model : MYSTIQUE Year : 1998 Manufacturer : FORD MOTOR COMPANY Service Bulletin Num : 041516 Date of Bulletin: AUG 09, 2004 NHTSA Item Number: 10011161 Component: ELECTRICAL SYSTEM Summary: MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE(S) P0420 AND/OR P0430. *TT

Re: P0420 #1205669 03/05/05 12:10 AM
Joined: Aug 2004 Posts: 1,238 Renton, WA T tropictour Hard-core CEG\'er
tropictour Hard-core CEG\'er T Joined: Aug 2004 Posts: 1,238 Renton, WA	That would be the precat. Your manifold is clogged with the precat material. -tropictour 2000 Contour SVT Tropic Green SHO Shop CAI Bassani 1999 Contour SE BAT Kit

Re: P0420 #1205670 03/05/05 12:34 AM
Joined: Feb 2003 Posts: 140 Pennsylvania 9 99_2.5_V6 OP CEG\'er
OP 99_2.5_V6 CEG\'er 9 Joined: Feb 2003 Posts: 140 Pennsylvania	Ignore this thread! I just searched some of the other forums and found more than enough info. I plan on taking it to the dealer! I hate when people don't search! Last edited by 99_2.5_V6; 03/05/05 01:06 AM.

Re: P0420 #1205671 03/05/05 12:51 PM
Joined: Sep 2002 Posts: 1,788 St. Louis, MO P projectSHO89_dup1 Hard-core CEG\'er
projectSHO89_dup1 Hard-core CEG\'er P Joined: Sep 2002 Posts: 1,788 St. Louis, MO	Originally posted by tropictour: That would be the precat. Your manifold is clogged with the precat material. -tropictour Uh, noooo.... 98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!

Re: P0420 #1205672 03/05/05 11:10 PM
Joined: Dec 2003 Posts: 4,155 Cheektowaga, NY P Pre98 Hard-core CEG\'er
Pre98 Hard-core CEG\'er P Joined: Dec 2003 Posts: 4,155 Cheektowaga, NY	Ford will never honor it for me, I've tried 3 times. They say it's not in the Database.

Re: P0420 #1205673 03/06/05 03:31 PM
Joined: Feb 2003 Posts: 140 Pennsylvania 9 99_2.5_V6 OP CEG\'er
OP 99_2.5_V6 CEG\'er 9 Joined: Feb 2003 Posts: 140 Pennsylvania	TSB 04-15-16 08/09/04 MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE(S) P0420 AND/OR P0430 FORD: 1997-1998 Contour MERCURY: 1997-1998 Mystique 1999 Cougar ISSUE Some 1997-1998 Contour/Mystique and 1999 Cougar vehicles equipped with the 2.5L engine may exhibit a malfunction indicator lamp (MIL) illuminated with diagnostic trouble codes (DTC) P0420 (Catalyst System Efficiency Below Threshold - Bank 1) and/or P0430 (Catalyst System Efficiency Below Threshold - Bank 2). ACTION Reprogram the powertrain control module (PCM) to the latest calibration using WDS release B32.5 or higher. Calibration files may also be obtained at www.motorcraft.com. Replacement of catalysts is no longer necessary to address the most common causes of this condition. WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage --------------------------------------------------------------------------------

Re: P0420 #1205674 03/08/05 10:41 PM
Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA B Big Jim_dup1 Hard-core CEG'er
Big Jim_dup1 Hard-core CEG'er B Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA	I took my car in today to get the reflash per this TSB and learned that it did not apply to my car. They hooked it up to the WDS and received a message that there are no later programs available for my car, that it is already programmed to the latest one available. I have an early 98 SVT that has California emissions. I thought that it may be good information that it doesn't apply to everything out there. Jim Johnson 98 SVT 03 Escape Limited

Re: P0420 #1205675 03/08/05 11:54 PM
Joined: Sep 2002 Posts: 192 PATRIOTS & RED SOX COUNTRY C contoured CEG\'er
contoured CEG\'er C Joined: Sep 2002 Posts: 192 PATRIOTS & RED SOX COUNTRY	Go For the MIL-ELIMINATORS See the THREADS on a search 1999 GREEN Contour SE SPORT Duratec V6, ATX, SUNROOF, 93,000 Miles, P0420 ON&OFF -replaced DS O2 --did not FIX New TORQUE CONVERTER @ 53,000-Intermittent P1744 New DASH at 53,000 and New DASH lifted-now using MOLLEY bolts to pull down

Re: P0420 #1205676 03/09/05 02:42 AM
Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA B Big Jim_dup1 Hard-core CEG'er
Big Jim_dup1 Hard-core CEG'er B Joined: Sep 2000 Posts: 4,693 Thousand Oaks, California, USA	Thanks. The light only comes on ocassionally, maybe once or twice a year. For that, I'm not going to worry about it. When the light comes on, I'll read the code and if it's the ocassional P0420 or P0430 I'll shut off the light and not worry about it. If it becomes more common or if the codes are different, I'll look into it. Jim Johnson 98 SVT 03 Escape Limited

Re: P0420 #1205677 03/09/05 07:30 AM
Joined: Apr 2002 Posts: 6,198 Lincoln, Nebraska D Davo Hard-core CEG'er
Davo Hard-core CEG'er D Joined: Apr 2002 Posts: 6,198 Lincoln, Nebraska	I had this come on several weeks ago and finally had it taken care of last week. Next time it comes on I'm yanking the cat and gutting the pre-cats. Seems like a very stupid solution to a very stupid problem.

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