Buick Repair Questions? Ask a Mechanic for Answers ASAP
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There is a service bulletin by Buick for this code which says it is often caused by a loose connector.....Anyone can fix the problem but considering you brought it to dealeship once already I'd tell them you expect problem to be fixed for free considering you shouldnt have to pay for the same repair to be made multiple times.....If another knock sensor doesnt fix problem you could have bad wiring or PCM (Powertrain Control Module) assuming there is no type of knock causing code to set. Let me know if you have questions, thanks.