P0420? - Ranger-Forums - The Ultimate Ford Ranger Resource


General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 11-24-2010
hozII's Avatar
Member
Thread Starter
iTrader: (5)
 
Join Date: Sep 2008
Location: athens, Al
Posts: 2,245
P0420?

well i got ALLLLLLL this stuff on my truck fixed and pulled upper intake (EGR port was completly clogged) and even cleaned all that out good!! The truck has been running great and finally got the CEL light off. Its been about 2 weeks and the CEL light came on again today...ran the code and its a P0420 bank 1. the truck is still running rich and using more gas than normal and that was a big part of my prob. before...since i've changed the plugs and wire (to motorcraft) the MPG's have somewhat improved.....from what the link below says im thinking it might be a front O2 sensor but was kinda lookin for some other opinions also....thanks!!


P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1)
Reply With Quote
  #2  
Old 11-24-2010
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,834
The cats are probably worn out or damaged. A bad O2 sensor is possible but less likely.

If the sensors are old, replacing the upstream O2 is not a bad first guess, especially considering that it might also help the poor fuel economy. It's way cheaper than starting by replacing the cats first but you might end up doing that anyway. The downstream O2 sensor leads an easier life than the upstream and may never need replacement.
Reply With Quote
  #3  
Old 11-24-2010
hozII's Avatar
Member
Thread Starter
iTrader: (5)
 
Join Date: Sep 2008
Location: athens, Al
Posts: 2,245
yeah i was thinking upstream too.......and i hope the cat isnt goin bad but the truck does have almost 300k on it so....i've also noticed that it does seem a lil restricted wot...i just figure its me goin into this 4cyl and used to driving my 4.0...i guess i can start there and hopefully that'll fix it..i saw a bosch premium OE replacement on advance auto for $47.99 so that's not to bad! i just know that conn. is gonna be a pain to get too!! lol
Reply With Quote
  #4  
Old 11-24-2010
87xlt's Avatar
Member
 
Join Date: Jun 2008
Location: In my truck!
Posts: 875
Thats the code for roll up a joint man!!!!!! Your truck is just wantin some herb lol.
Reply With Quote
  #5  
Old 11-24-2010
Member
 
Join Date: Jun 2007
Location: Killafornia
Posts: 1,523
x2 on medicating the truck
Reply With Quote
  #6  
Old 11-24-2010
hozII's Avatar
Member
Thread Starter
iTrader: (5)
 
Join Date: Sep 2008
Location: athens, Al
Posts: 2,245
Quote:
Originally Posted by 87xlt View Post
Thats the code for roll up a joint man!!!!!! Your truck is just wantin some herb lol.
Quote:
Originally Posted by ES894x4 View Post
x2 on medicating the truck
LOL!!!! well i prefer TLC.......lol!!
Reply With Quote
  #7  
Old 11-24-2010
87xlt's Avatar
Member
 
Join Date: Jun 2008
Location: In my truck!
Posts: 875
Well that works to lmao. But it really sounds like the cats are on the way out. Do you have emissions testing?
Reply With Quote
  #8  
Old 11-25-2010
Sonic04Edge's Avatar
RF Veteran

iTrader: (6)
 
Join Date: Jun 2004
Location: Madison. AL
Posts: 5,715
Replace the cats josh. Same thing was wrong with the contour. Replaced both and fixed that problem.
Reply With Quote
  #9  
Old 11-25-2010
hozII's Avatar
Member
Thread Starter
iTrader: (5)
 
Join Date: Sep 2008
Location: athens, Al
Posts: 2,245
Quote:
Originally Posted by 87xlt View Post
Well that works to lmao. But it really sounds like the cats are on the way out. Do you have emissions testing?
no this is alabama!! LOL!!! we're gonna get there though!!

Quote:
Originally Posted by Sonic04Edge View Post
Replace the cats josh. Same thing was wrong with the contour. Replaced both and fixed that problem.
just never known a bad cat to cause a vehicle to run rich and use fuel.....but who knows...im still gonna start with front o2 and see what happens.
Reply With Quote
  #10  
Old 11-25-2010
Sonic04Edge's Avatar
RF Veteran

iTrader: (6)
 
Join Date: Jun 2004
Location: Madison. AL
Posts: 5,715
Quote:
Originally Posted by hozII View Post
no this is alabama!! LOL!!! we're gonna get there though!!



just never known a bad cat to cause a vehicle to run rich and use fuel.....but who knows...im still gonna start with front o2 and see what happens.
The cats in the contour caused the car to run rich or lean I cant remember. I think it was rich. Either way I'd replace them. Or take them to a shop and see if you can just remove them all together. It might be cheaper.
Reply With Quote
  #11  
Old 11-25-2010
Downey's Avatar
RF Veteran
iTrader: (1)
 
Join Date: Oct 2007
Location: Muncy, PA
Posts: 8,470
when you have a miss fire or running rich and there is extra fuel in the exhaust it kills cats. replace your cats and call it a day. i just had this same code on 3 cars at work i replaced the cats and there were plugged as hell and solved all the problems.


your 02 sensors are probably reading low so they are dumping more fuel into the system thinking that the cat needs it to run properly. i wouldnt waist your time with 02 sensors i would just do the cats
Reply With Quote
  #12  
Old 11-25-2010
hozII's Avatar
Member
Thread Starter
iTrader: (5)
 
Join Date: Sep 2008
Location: athens, Al
Posts: 2,245
Quote:
Originally Posted by Sonic04Edge View Post
The cats in the contour caused the car to run rich or lean I cant remember. I think it was rich. Either way I'd replace them. Or take them to a shop and see if you can just remove them all together. It might be cheaper.
Quote:
Originally Posted by Downey View Post
when you have a miss fire or running rich and there is extra fuel in the exhaust it kills cats. replace your cats and call it a day. i just had this same code on 3 cars at work i replaced the cats and there were plugged as hell and solved all the problems.


your 02 sensors are probably reading low so they are dumping more fuel into the system thinking that the cat needs it to run properly. i wouldnt waist your time with 02 sensors i would just do the cats
Both very valid points but why spend $300+ for cats when i can buy a $50 o2 that may fix the whole problem? if not then i can worry about the cats i just wanna start with the simplest and cheapest thing first.
Reply With Quote
  #13  
Old 11-25-2010
Sonic04Edge's Avatar
RF Veteran

iTrader: (6)
 
Join Date: Jun 2004
Location: Madison. AL
Posts: 5,715
Quote:
Originally Posted by hozII View Post
Both very valid points but why spend $300+ for cats when i can buy a $50 o2 that may fix the whole problem? if not then i can worry about the cats i just wanna start with the simplest and cheapest thing first.
Its bound to need it anyway. Fix the o2 then see how it goes, but more then likely with how many miles are on the truck. they need to be replaced.
Reply With Quote
  #14  
Old 11-25-2010
87xlt's Avatar
Member
 
Join Date: Jun 2008
Location: In my truck!
Posts: 875
Well since you don't have emissions testing why don't you just cut the cats out and weld in a straight pipe in there place?
Reply With Quote
  #15  
Old 11-25-2010
hozII's Avatar
Member
Thread Starter
iTrader: (5)
 
Join Date: Sep 2008
Location: athens, Al
Posts: 2,245
Quote:
Originally Posted by Sonic04Edge View Post
Its bound to need it anyway. Fix the o2 then see how it goes, but more then likely with how many miles are on the truck. they need to be replaced.
true dat! lol

Quote:
Originally Posted by 87xlt View Post
Well since you don't have emissions testing why don't you just cut the cats out and weld in a straight pipe in there place?
well even though this is alabama it still is illegal and a pretty hefty fine if caught...plus i dont like having a CEL on in case there is another problem that occurs and wouldnt know it.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
CEL for P0420 hamricksj 4.0L OHV & SOHC V6 Tech 6 04-08-2014 11:35 AM
Code P0420 timpat92855 2.3L & 2.5L I4 Tech 1 03-19-2009 07:22 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 01:58 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.