Timing Tensioner problems of the 2001 Jaguar XJ8

The contact owns a 2001 Jaguar Xj8. The contact stated when starting the vehicle, the check engine and error warning lights were illuminated. The performance of the engine was restricted with minimal engine power. The vehicle was towed to the dealer where the contact was advised the failure potentially was caused by the primary or secondary timing chain tensioner. The dealer advised having the vehicle diagnosed in order to determine the exact failure and repair needed. The vehicle was neither diagnosed nor repaired. There was not a recall for the failure. The manufacturer was not contacted. The failure and current mileages were 90,000.