CEL code P0420 - Ideas? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Contour | Ford Mondeo | Mercury Mystique | Ford Telstar Forum for discussion of the Ford Contour, Ford Mondeo, Mercury Mystique and Ford Telstar

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 11-29-10, 04:07 PM Thread Starter
Registered User
 
Join Date: Mar 2010
Location: Central NC
Posts: 10
CEL code P0420 - Ideas?

'98 Mystique, 2.5 V6, 33k original miles, second owner. Runs smooth before and after CEL came on yesterday. Advance Auto pulled the single code (hope they did it right).

Their printout points to "Catalyst efficiency low-bank 1".
1) Cat converter defective (maybe caused by #2,3,or 4 below).
2) Engine misfire or running condition [Nope, runs smooth as silk.]
3) Large vacuum leak. [Not aware of any, runs smooth.]
4) Engine oil leak into exhaust. [Doesn't use oil & no know leaks.]

No mention of O2 sensor. What are the high probability causes here?

Thanks for your help.

FrugalOne is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 11-29-10, 06:58 PM
2002 F150 XLT
 
Bert's Avatar
 
Join Date: Nov 2008
Location: Oregon
Posts: 10,312
Re: CEL code P0420 - Ideas?

See if this helps. P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1)

Bert
Bert is offline  
post #3 of 4 (permalink) Old 12-11-10, 09:17 PM
Registered User
 
Join Date: Dec 2010
Posts: 1
Re: CEL code P0420 - Ideas?

This solved it for me in two different cars..

http://www.energeticforum.com/renewa...n-foulers.html
viprvette is offline  
post #4 of 4 (permalink) Old 12-12-10, 04:45 AM
Administrator
 
Join Date: Sep 2006
Location: Arkansas
Posts: 6,805
Re: CEL code P0420 - Ideas?

Very interesting article Viprvette. TY for the info
jwko is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Ford Contour | Ford Mondeo | Mercury Mystique | Ford Telstar


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome