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sometimes decats will not make the EML come on and other times the EML is constanly on. Best thing to do is get the code read and go from there but i 99% reckon its caused by the decat
Don't worry mate 9 times out of 10 its a cheap easy fix.
Find someone with a code reader or rstuner to read the code for you, steer clear of dealerships as you shall be robbed of your hard earned pennies just to plug it in and see what the problem is.
mine used to come on alot turned out to...
loads of things......
Pre cat 02 sensor
post cat 02 sensor
plugs
ht leads
coil pack
shagged cat
potato in the exhaust
^^Thats just a few as Jenic said the code needs reading to help pinpoint the problem
Its normal that most 172 cups fail the MOT due to little or no effort in the rear calipers.
There is a letter issued by VOSA to take to test centre, search on here to find the link to it