1995 Toyota Previa Failed Ca Emission High 25mph Registered 542 533 Max

1995 TOYOTA PREVIA
169 MILES
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failed CA emission for high NO at 25mph - registered at 542 NO with 533 NO max allowable. Passed NO at 15mph - registered 412 NO with 508 NO max allowable.

HC and CO readings all good registered well within max allowable.

Can I fix myself or needs an expert mechanic? I'm guessing EGR system needs cleaning/replacement?

Thanks for your help,
Raul
Mar 5, 2013 at 4:40 PM
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KHLOW2008
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My guess is a failing catalytic converter.
Mar 6, 2013 at 2:06 PM
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