Engine light of doom and despair

Ive had my FL i30n about 2 month now and the amber engine MIL came on a few weeks ago since then I’ve took it to the dealership 3 times and Halfords and none of them have been able to identify what’s causing it to come on.

The first time I took it to the dealership they done the HPFP replacement and the ECU software update and cleared the engine light then less than a day later it came back on. The second time they said it may have been the vacuum pump so they replaced it.

After that it didn’t come on for about 2 days so I took it to Halfords I thought maybe a different code reader could identify the cause but nope same thing came back with no codes stored.

It’s been intermittent since and I can’t identify the cause of when it comes on. It’s happened driving in eco, on smooth roads, came on when going over a bad pothole. It’s came on cruising in N mode and also driving harsh in N mode.

I had a ghost fitted a few days ago and they noticed some loose wires and after they secured them the light went off but again came back on a couple days later.

It seems no matter my driving habits it comes on and time between different aswell

Just wondering if anyone has an idea of what could be causing it to come on or could point me in the right direction.