Troubleshooting/resetting a P0420 Code - Taurus Car Club of America : Ford Taurus Forum
 
LinkBack Thread Tools
post #1 of 5 (permalink) Old 03-04-2012, 10:48 AM Thread Starter
Junior Member
 
Join Date: Mar 2012
Chapter: Northeast
Posts: 6
Rep Power: 0
 
Trader Score: 0 reviews
Troubleshooting/resetting a P0420 Code

I recently bought a 2006 Ford Taurus. I got it inspected after buying it, and it passed inspection and emissions. Took it home two days ago. Last night the check engine light came out, and when I got it scanned it gave a P0420 - which, from other forums, indicates catalytic converter problem, but also may be o2 sensors.

The car has been sitting for a while. One recommendation I got is to reset the code and drive it at highway speed for a while, and see if it comes back on, to see if it just might be a result of it sitting idle for some time.

So, the question I have is, how can I get the code reset? I've heard that you can do this by disconnecting the battery, but I've also heard people recommend that you NOT do this.

Thanks!
JordanB is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 03-04-2012, 10:52 AM
Devoted Member
 
danhasenauer's Avatar
 
Join Date: May 2007
Location: Rochester, NY
Chapter: Northeast
Posts: 2,426
Rep Power: 25
 
Trader Score: 0 reviews
The battery disconnect will usually do it, but I like to go to AAP, borrow their scanner and do it myself in their parking lot. Another nifty reason to invest in your own good quality handheld scanner.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'96 LX DOHC Moonlight Blue
Every option but the car phone
RIP 'Ol Blue - 09/2012
danhasenauer is offline  
post #3 of 5 (permalink) Old 03-04-2012, 11:02 AM
Junior Member
 
Join Date: Aug 2009
Posts: 45
Rep Power: 0
 
Trader Score: 0 reviews
I've got the same car. Having the somewhat problem, my code comes up after it been erased in about 3 or 4 days, I would guess that the dealer did the same for that car. Had the code erased just before you got the car. Read my problem on P0420 post, may help you.

Also that car has a problem with code that states multiple miss fires, there is a fix at the dealer that they reprogram it to widen the specs, it's in a tech bulletin, but I think they might charge for it. Lee
lee231 is offline  
post #4 of 5 (permalink) Old 03-04-2012, 11:21 AM
Devoted Member
 
Join Date: Apr 2003
Location: Virginia
Chapter: Southeast
Posts: 2,302
Rep Power: 38
 
Trader Score: 0 reviews
Quote:
Originally Posted by JordanB View Post
I recently bought a 2006 Ford Taurus. I got it inspected after buying it, and it passed inspection and emissions. Took it home two days ago. Last night the check engine light came out, and when I got it scanned it gave a P0420 - which, from other forums, indicates catalytic converter problem, but also may be o2 sensors.

The car has been sitting for a while. One recommendation I got is to reset the code and drive it at highway speed for a while, and see if it comes back on, to see if it just might be a result of it sitting idle for some time.

So, the question I have is, how can I get the code reset? I've heard that you can do this by disconnecting the battery, but I've also heard people recommend that you NOT do this.

Thanks!
The P0420 code is for the bank one cat efficiency being below threshold, which if the O2 sensor is ok, suggests a problem with cyl bank-1 cat converter.
All that said, cats don't usually just die prematurly, something usually causes their demise, so we need to look up stream for a cause, like a coolant leak, fuel trim problem, ect, that you would want to put right Before replacing the cat converter, lest the new one be put down too!!!!
SO, if you have other trouble codes, post All code Numbers you have.

Disconnecting the battery B- cable will erase the code, but will also wipe the KAM, which includes the fuel trim & base idle memory, so to prevent possible driveability problems, you'll want to at least do a cold & warm idle relearn routine listed here. Can Someone Tell Me How To Reset My Check Engine Light?

More thoughts for consideration, let us know how it goes.

94 Taurus GL 3.8L PEP204A
99 Ranger 4dr 4.0L 5spd Auto
Payload & Tow Pkg

Details are trifles, but trifles make perfection & perfection is no trifle (Ben Franklin)
Our signature is a sign of a job completed, autograph your work with excellence.
pawpaw is offline  
post #5 of 5 (permalink) Old 03-04-2012, 12:19 PM
I'll Be Watching You!

 
sousa632's Avatar
 
Join Date: Jun 2011
Location: Forked River, NJ
Chapter: Northeast
Year: 2001
Model: Mercury Sable Wagon
Engine: 3.0L 24v Duratec V6
Posts: 12,650
Rep Power: 71
    
Trader Score: 2 reviews
Quote:
Originally Posted by lee231 View Post
I've got the same car. Having the somewhat problem, my code comes up after it been erased in about 3 or 4 days, I would guess that the dealer did the same for that car. Had the code erased just before you got the car. Read my problem on P0420 post, may help you.

Also that car has a problem with code that states multiple miss fires, there is a fix at the dealer that they reprogram it to widen the specs, it's in a tech bulletin, but I think they might charge for it. Lee
The misfire is causing the p0420. Raw fuel dumping into the cat and clogging it, thereby causing an 'inefficiant flow' code. Mix the misfire, then worry about the cat.

John
'01 Sable LS Premium Wagon Duratec, 99 Dodge Durango 318 V8

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
sousa632 is online now  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Taurus Car Club of America : Ford Taurus 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:
OR

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
Show Printable Version Show Printable Version
Email this Page Email this Page



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