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Old 05-03-2008, 03:25 AM
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tech22 tech22 is offline
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2005 Frontier Crew Cab Frontier Crew Cab
05 nissan frontier
 
Join Date: Jan 2008
Location: alliance,ohio
Age: 70
Posts: 2,049
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The vent control valve may have become stuck, a common problem with that model. You can down load how to test it within this site. As for the knock sensor,I would just clear the code from history and wait to see if it returns. It's no big worry
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