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> Engine Code Help Please
post Jan 22 2013, 04:52 PM
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Group: Members
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Joined: 14-February 05
Member No.: 6,298
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Location: MN
Drives: Galant 2000

Hey Folks,
I have an ES v4 with error code P0421, referring to bank 1. I have searched plenty of post across the web where everyone refers to where bank 1 and 2 are on v6 galants but not v4. Can anyone help me idenity the location of this bank so I can attempt to change the o2 Sensor. Any pointers would good as well. Also I changed my plugs a few days ago, and noticed I had some oil on one. Could this have caused my P0421 error? ( the error has come back after changing the plug as well)

Thanks in advanced.
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KiT TeUnG 2549
post Jan 22 2013, 08:34 PM
Post #2

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Group: Super Mod
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Location: San Sai , Chiang Mai ,TH
Drives: 1997 Mitsubishi Diamante VR-S SUPER INVECS II , 1990 Mitsubishi Galant VR4 MR, 2006 Mitsubishi Triton PLUS 3.5 DOCH , 2001 Mitsubishi Galant GSR

Actually you have an I4 engine (inline) all V series engines have 2 banks the I4 as you have has only one bank . Its referring to a bank of cylinders to which you have only one
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post Jan 23 2013, 08:27 AM
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Drives: 2007 OUTLANDER ES with the v6 and the 6 speed(no flappy paddles),2001 kia rio,1979 chevy k20 stepside

p0421 is a catalytic converter code...generally it refers to the warm up cat..which is the first cat either at or just past the exhaust manifold...if it was misfiring or running bad due to bad plugs-you probably damaged the cat
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