How to pass emissions? on 1993 Dodge Caravan

My van failed emissions due to a high CO (20.03) and a high NOX (4.42). How can I get these numbers lowered in ordered to pass emissions.

by in Phoenix, AZ on February 29, 2012
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1 answer
ANSWER by , February 29, 2012
There is no way to know without testing the vehicle. You could have a problem with a sensor, wiring, computer or catalitic converter. You will have to have the vehicle tested by a knowledgeble tech.