Car emissions advice

[X5smw]

Evening all.. my friends mini 1.6 just failed its mot on emissions. 
can someone point me in the right direction. Does this sound like lamda sensor failure or cat failure? 
 

thanks!

stu 

[Greydog]

Morning Stu

Could well be O2 sensors failing that is where I would start but normally they would throw an engine light.

It needs a scan to be sure, could be just general accumulation of wear and tear. Things like MAF, engine EVAP system. Vacuum lines, Air leaks even a compression test 

Good Luck

Dave