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04-05-2005, 09:25 PM
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#1 | |
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AF Newbie
Join Date: Nov 2003
Location: Firebaugh, California
Posts: 10
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ODB II Code 0420 - Catalyst System Efficiency Below Threshold (Bank 1)
I got this code for the past 6 months. I have a code reader so I just clear it. I searched the web and I think it comes from either the O2 sensor or catalytic converter, maybe both. I was wondering if anyone had the same problem and had it corrected?? Any reply will be appreciated. I have a 2001 SE 3.1 w/100,00 miles.
Thanks Gil |
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04-05-2005, 09:54 PM
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#2 | |
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AF Regular
 Join Date: Feb 2002
Location: port Richey, Florida
Posts: 180
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U really need a scanner to hookup to make sure the rear O2 is putting out readings but it would point to bad catalytic convertor.
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04-07-2005, 12:16 AM
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#3 | |
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AF Enthusiast
 
Join Date: Mar 2005
Location: Medina, Ohio
Posts: 1,454
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Re: ODB II Code 0420 - Catalyst System Efficiency Below Threshold (Bank 1)
i agree, it also could be a leak from the 02 senc.
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