Emissions light on and car won't go, has to warm up first... ?

Hi guys, car has flexi 's that need replacing but my emissions light came on and then the car want go or even rev freely... only once its warmed up does the car move... any ideas were to look first?
 
Get it checked out by a Renault tech. Mine had emissions light come on but drove fine. Changed the lamda sensor and the emissions light came back ended up being a faulty precat.