Thread: 91 420 SEL failed emissions - GA
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  #3  
Old 01-08-2008, 05:18 PM
manny manny is offline
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
Start by getting a new fuelfiller cap.
I doubt you need a catalytic converter, based on your CO & HC readings.
NOx is controlled mostly by the EGR valve.
I would check it ( or have it tested ) first.
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