for a fault like this it must be a 1.2 16valve ? although you dont say. Try 1,disconnecting the battery for 3 minutes then reconnect
2,make sure metal cover on computer connector behind inlet manifold has not chafed through wiring.
3,might need reprogramming by dealer.
Try these in this order. give me some more info on car & i may be able to help further. All the best
