wishful1 Posted July 29, 2005 Share Posted July 29, 2005 I have a 96 LS400 and I'm getting code PO420 Bank1 and PO430 Bank2 Catalyst Efficiently below threshold. Can anyone tell me which 02 sensor these are. I know there are 2 in the front and 2 in the back, but I need to know what Bank1 and Bank2 means. Thanks for any help. Quote Link to comment Share on other sites More sharing options...
sha4000 Posted July 29, 2005 Share Posted July 29, 2005 I have a 96 LS400 and I'm getting code PO420 Bank1 and PO430 Bank2 Catalyst Efficiently below threshold. Can anyone tell me which 02 sensor these are. I know there are 2 in the front and 2 in the back, but I need to know what Bank1 and Bank2 means.Thanks for any help. ← you have to find out which side of the engine your #1 cylinder is on and that would be bank 1 and of course the other side is bank 2 but are you sure those are 02 codes it sounds like your cats might be going bad(lets hope thats not the case) Quote Link to comment Share on other sites More sharing options...
pachocco1 Posted July 30, 2005 Share Posted July 30, 2005 This may help. insp.pdf comp.pdf Quote Link to comment Share on other sites More sharing options...
pachocco1 Posted July 30, 2005 Share Posted July 30, 2005 This too. cip0420p.pdf Quote Link to comment Share on other sites More sharing options...
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