Hello and HELP! CODE P0420 - DodgeForum.com



3rd Gen Ram Tech 2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Hello and HELP! CODE P0420

Reply
 
 
  #1  
Old 12-09-2007, 11:39 AM
DonnasDodge
DonnasDodge is offline
Thread Starter
 
Join Date: Dec 2007
Posts: 3
Default Hello and HELP! CODE P0420

Hello everyone and this is my first post on the forum. I love my truck although I haven't done a ton to it, just but 35" tires. Just wanted to say hey and I plan on being part of this family for awhile since I still have a lot of plans for the truck.

Anyway, sorry to jump in with a problem, but I have one. After a 800 mile trip to and from Reno, our truck threw a CEL. The code is P0420. I had this checked recently and it came up with the following:

Definition
Catalyst efficiency low-bank 1

Explanation
The oxygen sensors monitor the catalytic converters ability to store oxygen.

Probable Causes
1.) Catalytic Converter defective (Failure possibly due to #2, 3, or 4)
2.) Engine misfire or running condition
3.) Large Vacuum leak
4.) Engine oil leakage into exhaust-valve guide seals, piston rings


Now some backstory. Right now with Christmas coming, I don't want to take it down to someone right yet with out trying to figure this out a little by myself. I have had people recommend replacing the O2 sensors, but after checking it looks as if there are 4 of them (2 before and 2 after the CC).

What would you guys recommend? I really would like to get this solved without having to shell out tons of cash right before the Holidays.

Thanks again for everyone's help.

Arthur
Reply With Quote
  #2  
Old 12-09-2007, 05:14 PM
DonnasDodge
DonnasDodge is offline
Thread Starter
 
Join Date: Dec 2007
Posts: 3
Default RE: Hello and HELP! CODE P0420

Anyone?
Reply With Quote
  #3  
Old 12-09-2007, 05:42 PM
CarGuyOhio's Avatar
CarGuyOhio
CarGuyOhio is offline
Admin formally known as 94rt10ohio
 
Join Date: Apr 2005
Location: Curtice, OH
Posts: 9,024
Default RE: Hello and HELP! CODE P0420

#2 should be out. There are codes that would show up for misfires

#3 should be easy to hear

#1 would require to to put oil in the truck often

May also help to state year, miles, engine, ect.
Reply With Quote
  #4  
Old 12-09-2007, 05:48 PM
Gone Fishin
Gone Fishin is offline
Record Breaker
 
Join Date: Feb 2005
Location: Bristol, IN
Posts: 2,290
Default RE: Hello and HELP! CODE P0420

Donna,

It would really help if we knew what exactly you are running. I'm assuming a 5.7L Hemi, In which case I would start out by checking for a vacuum leak, especially around the charchol canister and associated lines. It should be located under the truck in the frame rails behind the driver. The hoses are just plain old rubber, and if they crack much, you get a large air leak. Next, If you're not seeing blue smoke on startup, chances are the valve seals are ok. I would wait until you check out the vacuum possibility before I would spring for the O2 sensors (after the converters). How many miles, last tune-up??? etc.
Reply With Quote
  #5  
Old 12-22-2007, 12:06 PM
DonnasDodge
DonnasDodge is offline
Thread Starter
 
Join Date: Dec 2007
Posts: 3
Default RE: Hello and HELP! CODE P0420

There are about 57k on the truck and its a 2005 Dodge Ram 1500 QDCB Hemi. Last tune up was about 900 miles ago, but will be needing to do the 60-75k service soon.

Which hoses should I check first? Is there a way of determining that it is a vacuum leak other than visual inspection?

Thanks again everyone for your help. Trying to avoid a fat charge from a mechanic to just figure out the problem, then another fat charge for the solution.

Merry Christmas!
Reply With Quote
  #6  
Old 01-12-2008, 08:07 AM
Rabies
Rabies is offline
 
Join Date: Dec 2004
Location:
Posts: 5
Default RE: Hello and HELP! CODE P0420

Reply With Quote
 
 
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Gone Fishin
3rd Gen Ram Tech
1
07-05-2016 07:49 PM
Miketech137
Dodge Caravan
5
10-20-2015 07:27 PM
just1creation
Dodge Stratus
1
08-04-2015 11:05 AM
JoshuaYsassi
2nd Gen Ram Tech
21
07-28-2015 11:16 AM
Stratus0159
Dodge Stratus
2
07-16-2015 11:22 PM



Thread Tools
Search this Thread

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -4. The time now is 10:47 AM.


 
  • Ask a Question
    Get answers from community experts
What's your question?
Send