What's next after failed smog test??? Fixing and cost before re-smogging

1996 GEO PRIZM
109,000 MILES • 1.6L • 4 CYL • FWD • MANUAL
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D33MAIN3
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Emissions tested and recorded high and failed when engine ran for 5 mins at 15 miles per hour, but when tested for 5 mins at 25 mph emissions recorded lower and results passed, so over all resulting in a failed smog? What should be done to engine to pass smog now?
Apr 16, 2016 at 9:19 PM
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HMAC300
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Change oil and filter, air filter, then drive for 20 miles on expressway then get it tested while still warm. The warmer the vehicle is the more likely it is to run just a bit better and that tiny difference could be the little extra you need to pass the test.
Apr 17, 2016 at 8:44 AM