Hi everyone,

Occasionally, say once every 3 months, when I startup the car after being garaged overnight - the car will shake quite a lot for a couple of minutes if i don't drive away immediately, followed by a yellow engine light, which in the manual says Deterioration of exhaust emissions, have it checked.
The shake feels like it is coming from the engine.

I find it happens when i just have to re-park the car, with the engine cold on start-up and cold when i shut it off.
I had the dealer check it and they found no codes i explained the situation they think it is normal.

Is it normal?? any thoughts?

cheers