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Message: <blockquote data-quote="dodgeman" data-source="post: 1705281" data-attributes="member: 216312"><p>that's the egr valve it recirculates the unburned exhaust fumes from the exhaust chamber and runs them back through the engine again to re-burn them,when its not working right though it will cause one to fail a smog test,they cost on average about 40-100 bucks depending on what type car you drive,call a parts store and tell them what type car you have and they can give you a price on one,good luck.</p></blockquote><p></p>