My Golf gti mk 6, 09 registration with 51k, developed a cam fault 3 weeks ago. On investifation, according to the VW garage this isn't the well-documented timing chain tensioner problem that TSI engines are prone to; instead the cam adjuster failed, causing the timing chain to stretch with resulting damage to chain tensioner, cylinder head and vsrious other associated parts. Cost to fix: £4600. VW originally offered 14% towards the cost (10% Customer Care + 4% local garage), since increased to 50% when i told them that wasn't anywhere near satisfactory.
Is this essentially the common timing belt tensioner fault? If not, what might have caused it?
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