Emissions, mot failure

[Neathtvr]

Car been lying idle in garage for approx 3 years since last mot. Been started up occasionally but not taken for a run on the road.
Has recently failed mot on emissions.
A. Carbon monoxide content at idle exceeds default limit 4.62
B. Hydrocarbon content after 2nd fast idle exceeds default limits 2750
C. Lambda reading after 2nd idle outside specified limits.
Would appreciate any advice on what’s wrong and needs replacing etc.
Has it got anything to do with the Airflow Meter.