Ford Fiesta 2013 exhaust smell issue

[Scotty1984]

Evening all, so for the past few days I’ve been smelling like a eggy exhaust smell whilst driving, usually happens if I’m stationery in the vehicle, coming I think from the air vents but could be wrong, now I assume it’s an exhaust leak or worst failed catalytic converter but if anybody has any thoughts or would know the cost for repair that would be great, gonna book it into my local garage just in case 

[eddie eastwood]

Take it for a good run of at least 30 min,s using 3rd gear at high rev,s

[Scotty1984]

1 hour ago, eddie eastwood said:

Take it for a good run of at least 30 min,s using 3rd gear at high rev,s

Yes mate just did and it’s definitely an eggy smell coming through into the front driver side where I can smell it, will call the garage tomorrow