Latest service on 2014 Polo came up with error codes - timing angle retardation on cyl. 1 to 4 as well as codes for misfires on cylinder 1 (0 of), cyl 3 (1), cyl 4 (68 of) and cyl 6 (?) (0). Mechanic suggests timing chain tensioner is faulty and need to replace along with timing chain. Only 68K km...