I just bought the 500L second hand today and when I've switched the engine on after filling the petrol up, this stop start disconnected and check engine warning came up as well as the engine management light.

Its a 0.9 Twinair 500L 2013 reg

Also it doesn't seem to be running at 105bhp

When pulling off it is really slow and takes plenty of time to gather speed.

Not sure what the problem can be, I'm taking it back to where we bought it from tomorrow morning but wondering if there's a quick fix in the meantime.

Thanks in advance.

How did you get on? I've a similar issue. I thought fiat fixed it but no its bavk