is it a clogged cat? - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 10-05-2012, 04:31 PM   #1
mitchv
Focus Enthusiast
 
Join Date: Oct 2010
Fan#: 79720
Location: Toledo OH, OH
What I Drive: 2003 blue zx3

Posts: 487
FF Reputation: 4 mitchv Good Standing Member
Buy-Sell-Trade Rating: (0)
is it a clogged cat?

So my check engine light is on, went to autozone they did the reader thing with the codes, turns out to be a clogged cat, atleast thats what the code says. Im having no running issues, im getting the same mpg, there isnt any kind of a smell and there is pressure comming out the back tail light? I already tried reseting it and it came back on for clogged cat. is it possible the cats clogged even though im not experiencing any symptons of if


mitchv is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 10-05-2012, 05:45 PM   #2
Svt5.0
Focus Enthusiast
 
Join Date: Sep 2010
Fan#: 78677
Location: Antioch, CA
What I Drive: 03 Svt Focus

Posts: 147
FF Reputation: 1 Svt5.0 Good Standing Member
Buy-Sell-Trade Rating: (1)
What was the code? There is no code for a clogged cat.
__________________
...
Svt5.0 is offline  
    Reply With Quote Quick reply to this message
Old 10-06-2012, 12:34 PM   #3
BC_ZX3
DTC P0606
 
BC_ZX3's Avatar
 
Join Date: Jul 2007
Fan#: 48751
Location: Vancouver, BC, Canada
What I Drive: 2001 Red ZX3 Turbo

Posts: 2,941
Points 2,059, Level 27
Points: 2,059, Level: 27 Points: 2,059, Level: 27 Points: 2,059, Level: 27
Level Up 40% Completed
Level up: 40% Level up: 40% Level up: 40%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 88 BC_ZX3 Excellent Standing Member
Buy-Sell-Trade Rating: (3)
Quote:
Originally Posted by Svt5.0 View Post
What was the code? There is no code for a clogged cat.
^This.
If DTC code turns out to be the one shown below, it may simply indicate the cat is no longer doing its job of cleaning the exhaust gases; it doesn't necessarily mean the cat is clogged or physically damaged. In that case, it won't affect how the car runs but you won't pass an emissions test with it. Investigate and eliminate all other possible causes before replacing a catalyst as the part can be expensive.


P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
Indicates Bank 1 catalyst system efficiency is below the acceptable threshold
Causes:
Use of leaded fuel
Damaged HO2S
Malfunctioning ECT
High fuel pressure
Damaged exhaust manifold
Damaged catalytic converter
Oil contamination
Cylinder misfiring
Downstream HO2S wires improperly connected
Damaged exhaust system pipe
Damaged muffler/tailpipe assembly
Retarded spark timing
Compare HO2S upstream and downstream switch rate and amplitude. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage which makes the switching frequency of the downstream HO2S very slow and reduces the amplitude of those switches as compared to the upstream HO2S. As catalyst efficiency deteriorates, its ability to store oxygen declines and the downstream HO2S signal begins to switch more rapidly with increase amplitude, approaching the switching rate and amplitude of the upstream HO2S. Once beyond an acceptable limit the DTC is set.
BC_ZX3 is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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

Forum Jump


All times are GMT -5. The time now is 09:04 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat