Its probably the MAF. Dont bother with a cheap aftermarket one, they dont last very long.
If it was a wheel sensor it usually brings on the ABS and traction control lights
If it was a camshaft or crankshaft sensor it would run rough or not at all.
Never had a cat go on these so unlikely
Before trying a MAF, check the inlet rubbers, these are prone to splitting and will give the same symptoms as a MAF going down. Single vanos have one rubber, double vanos have two rubbers. We have known the throttle bodies to stick slightly open due to lack of use also which cause the same problem.
This is tricky to get at to clean and lubricate but the cheapest option
If it was my car I would clean throttle body then replace the rubbers anyway. Then replace the MAF if the above did not cure it.
Hope this helps
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