Failed emissions test...help

cstemm

Registered User
Failed the emissions test horribly today. Hydrocarbons was 1136 ppm and acceptable is 186 or something. I have codes 51,54 and 98. I have the book. Can the act and the coolant temp sensor cause these problems. The book says that the circiut is open. Not sure what that means. Any help is great. Plugs and o2 sensors are new. Thanks Chris
 
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