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2 days after fitting a full miltec to my s4 cab, bought from
a member on the forum, ive got the engine light permanantly
on ,is this just coincedence or is this a common thing , the
garage who fitted it said they had to do some mods to it as
it didnt fit that well , just seems strange it happened 2days
after and not sraight away, it all drives well, any ideas?

Sounds like a lambda probe fault, my just be a loose connector

More than likely it is a cold start fault.

thanks guys it came on about 10 minutes when the car warmed up,
would this fault show on a v/com?

Yep easy diagnosis

fault code 2nd bank cat not warming up properly, as i said the sensor was moved slightly
so would spacers be the solution or can the light be removed somehow?

I had that after removing the pre-cats. IIRC it can be removed permanently

A remap could take care of this sort of fault codes