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Message: <blockquote data-quote="frankiele16" data-source="post: 2336870" data-attributes="member: 809935">Smog check failed on high NO PPM. I have a Honda Civic 1993 that didnt pass the NO emissions test, everything else passed except this: the MAX allowed at 15mph is 731, my number was 2299 (failed), the max allowable at 25mph is 798, my number was 333 (passed). please let me know what parts should I fix/ replace to pass the test. and does anybody know how come the difference between 15mph & 25 mph on this NO test is so big ( 333 vs 2299). anything wrong ??? thanks</blockquote>