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Help trouble code PO420 #59575 05/19/08 12:54 PM 05/19/08 12:54 PM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger OP master
540challenger OP master 5 Joined: Apr 2007 Posts: 2,826 NY usa	I have one of my work vans with the Code PO420. As far as i could tell it is a bad cat. How could i should i procede in troubling shooting this. Scanner reads PO420 catayst system efficiency below threshold ( Bank 1) So do i have 2 cats since it is on back 1 i have to go under and check in a little bit.

Re: Help trouble code PO420 [Re: 540challenger] #59576 05/19/08 01:51 PM 05/19/08 01:51 PM
Joined: Nov 2004 Posts: 25,050 Texas GoodysGotaCuda 5.7L Hemi, 6spd
GoodysGotaCuda 5.7L Hemi, 6spd Joined: Nov 2004 Posts: 25,050 Texas	that can also be your post-cat/downstream oxygen sensors. in most cases the codes will give you a direction, and not quite just what part to replace. 1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi 2020 RAM 1500 [img]https://i.imgur.com/v9yezP9.jpg[/img]

Re: Help trouble code PO420 [Re: GoodysGotaCuda] #59577 05/19/08 02:01 PM 05/19/08 02:01 PM
Joined: Jan 2007 Posts: 54 Michigan C cousinbob member
cousinbob member C Joined: Jan 2007 Posts: 54 Michigan	Sent you an email. Send me the info on the vehicle so I can give you some help.

Re: Help trouble code PO420 [Re: cousinbob] #59578 05/19/08 02:18 PM 05/19/08 02:18 PM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger OP master
540challenger OP master 5 Joined: Apr 2007 Posts: 2,826 NY usa	Thanks i am at work i will sned you an e-mail when is get home aroun 4:00 thanks

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