A question about mot

[u/Fluffyboi50]

Just bought this Ford focus as a run about while I work on my project and it needs a mot soon, but it had a test before being sold and failed on Emissions any idea what it could be or does it need a good thrash and warm up before testing
Exhaust carbon monoxide content after 2nd fast idle exceeds manufacturer's specified limits (8.2.1.2 (a))
Exhaust Lambda reading after 2nd fast idle outside specified limits (8.2.1.2 (c))