Hello every one!!

Visiting here from other parts of the forum.

A friend has a 2008 XJ8 with about 70K miles, her light is on. I pulled her codes and she has :

P0300
P0305
P0303
P0301
P1316
P1000.

She had her mechanic put new spark plugs on it recently, when the codes came up first. The light stayed of for a month but came back on today.

If this was my XJS I would say ignition copils, but I wanted to get guidance before making recommendations.

Thanks!!