so i got this code P0421

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so i got this code P0421

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Mitsubishi Forums >> Mitsubishi Models >> Mitsubishi Lancer and Lancer Sportback >> so i got this code P0421

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so i got this code P0421 - 3/25/2008 1:12:18 PM

blufabric

Posts: 16
Joined: 3/25/2008
Status: offline

So i just got myself a 03 lancer and sadly i already got my first CEL

the code im getting is this P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)

since i dont know a thing about my lancer yet, i wanted to see if the experienced guys in this forum can help me out

any suggestions would be gladly appreciated!

Post #: 1

RE: so i got this code P0421 - 3/25/2008 1:39:16 PM

Sebba

Posts: 14719
Joined: 2/20/2006
From: San Antonio, TX
Status: offline

Catalytic converter is out. Either that or an o2 sensor. 100% positive its one of those. Im betting on the cat.

< Message edited by Sebba -- 3/25/2008 1:45:08 PM >

_____________________________

These cranks are made for walkin'''', and thats just what they''''ll do, one of these days these cranks are gonna walk all over you

(in reply to blufabric)

Post #: 2

RE: so i got this code P0421 - 3/25/2008 1:55:18 PM

blk n tan

Posts: 133
Joined: 2/19/2008
Status: offline

yep. the cat is out. fairly common on the lancers how many miles do you have on the car? there is some kind of a warranty extension for certain cars that are having this problem. i just replaced one on an 03 lancer

(in reply to Sebba)

Post #: 3

RE: so i got this code P0421 - 3/25/2008 6:32:29 PM

07outty

Posts: 110
Joined: 5/26/2007
Status: offline

..go down a couple of threads.

look at the replys to "my baby's sick".

(in reply to blufabric)

Post #: 4

RE: so i got this code P0421 - 3/25/2008 7:45:02 PM

blufabric

Posts: 16
Joined: 3/25/2008
Status: offline

quote:

ORIGINAL: 07outty

..go down a couple of threads.

look at the replys to "my baby's sick".

checked it out, thanks!

so what would you guys recommend?

an oem cat,a test pipe,or any other suggestion?

oh and is it bad driving around with my cat messed up?

(in reply to 07outty)

Post #: 5

RE: so i got this code P0421 - 3/25/2008 7:55:24 PM

blufabric

Posts: 16
Joined: 3/25/2008
Status: offline

quote:

ORIGINAL: blk n tan

yep. the cat is out. fairly common on the lancers how many miles do you have on the car? there is some kind of a warranty extension for certain cars that are having this problem. i just replaced one on an 03 lancer

95k

so what cat do you recommend?

(in reply to blk n tan)

Post #: 6

RE: so i got this code P0421 - 3/26/2008 12:36:18 AM

nawgee

Posts: 59
Joined: 3/7/2005
Status: offline

dude i have the same problem but different people keep telling me different things like its DEFINITELY the header....im starting to believe that its the header that is out cause of the many people with the same problem....ima get a new header tomorrow and ill let you know what that does

(in reply to blufabric)

Post #: 7

RE: so i got this code P0421 - 3/26/2008 1:43:01 AM

blufabric

Posts: 16
Joined: 3/25/2008
Status: offline

yea for sure keep me updated!

(in reply to nawgee)

Post #: 8

RE: so i got this code P0421 - 3/26/2008 6:33:29 AM

BEAT

Posts: 400
Joined: 10/29/2007
Status: offline

there should be 2 sensors on your car one in the header and one near the Catalyctic Converter the same with the 2008 Lancer.

Road Race is developing the Headers for the PZEV engine. for now they're only selling the non pzev engine- Headers

(in reply to blufabric)

Post #: 9

RE: so i got this code P0421 - 3/26/2008 7:22:52 AM

blk n tan

Posts: 133
Joined: 2/19/2008
Status: offline

@ 95k you're past the warranty extension if your car was even a part of it. i wouldnt recommend test pipe cuz you're check engine light is still gonna be on

(in reply to BEAT)

Post #: 10