When we bought the 04 for the wife to drive it was pulling a code for low oil pressure. Dealer being a friend of ours he had it checked out. Had to replace the front cover. Mechanic that changed the front cover noticed on head 1 the cam was retarded by 1 tooth. He rest the cam to be timed right. Now it keeps pulling a cam code issue on 1 or both heads. One changed the one head. Has anyone ever had this issue or know how to fix it

Thank you for your help!