engine management light keeps coming on

hi all,

so I had this problem where the engine management light came on, took it to a mechanic and was told that 'coil 1' was faulty.
So £70 later and I had a new coil. Problem is, since then, its come on twice again. the mechanic says it could be faulty so as a temp measure, cleaned it so the light went off but its back again.

What do you guys think the problem could be. I don't understand why a new coil would still produce the same problem, so it got me thinking; could it be something else?
 
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