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Registered User
Join Date: Apr 2007
Location: Austin, TX
Posts: 4
OBD Code 0420

Newbie looking for help. Check engine light has come on in my 01 911. Less than 60K miles. Car seems to run fine. Code is 0420 which is "Catalyst System Efficiency Below Threshold (bank 1)" The car has a modified exhaust if that helps. Can anyone help me understand what this means and what could be causing this error? Thanks.
Old 05-19-2007, 05:57 AM
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AFJuvat's Avatar
Join Date: Feb 2001
Location: Viera FL
Posts: 5,643

Your catalyst is not operating as well as it should on cylinders 1 - 3.

This error can be caused by excessive amounts of stop and go driving.

I would suggest taking it out and letting her rip and see if the problem corrects itself. Otherwise, you will be looking at a catalyst in your future.

Does your custom exhaust allow for both oxygen sensors on both banks?
Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann.

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Old 05-19-2007, 12:36 PM
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