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2nd Generation This includes all Eclipses, and Talons built from 1995-1999

Code 420

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Old 09-02-2007, 06:10 PM
Catch22!'s Avatar
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Join Date: Aug 2007
Posts: 79
Default Code 420
Hi

Check engine light came on. Computer reade 420 Catalyst System Efficiency Below Threshold (Bank 1). Anyone give me a hint of what that means and what I need to do?
 
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Old 09-03-2007, 07:08 AM
Join Date: Nov 2006
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Default RE: Code 420
that means the bowl is clogged and the car wants to get high soon
either you got a bad 02 sensor, or a catalaytic converter is clogged or getting there
 
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