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PO420 code

 
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John Vollenweider



Joined: 02 Mar 2006
Posts: 52
PostPosted: Mon May 03, 2010 9:03 am    Post subject: PO420 code Reply with quote
with code po420 stored , what cat should I change?
Thanks,
John
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edjack



Joined: 04 Feb 2002
Posts: 3887
Location: San Jose, CA
PostPosted: Mon May 03, 2010 2:26 pm    Post subject: Reply with quote
I can't remember, 6 or V8?

P0420 is bank 1, forward 3 cyl, or V8 right bank.

How many miles on the cats? Could also be a bad post-cat sensor. I'd change that first, unless the cats are rattling inside. Tap them with a rubber mallet.
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Ed BMW CCA member since 1987 (Nr. 62319).
'97 540i 6 speed Aspensilber over Aubergine interior.
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