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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.
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.
Q&A > Dodge > 2005 Dodge Caravan
Q&A > Dodge > 1997 Dodge Caravan