Hey , i have no idea how to use this site but im sure ill work it out , i bought a 2001 punto sporting the other day runs perfect only done 39, 000 miles and been recently serviced. However today the airbag warning light and the injection warning light the came on. any ideas ?

Dealer time i'm afraid.

any ideas on how much thats going to set me back ?

Can only speculate but hours diagnostic (£50-60) airbag fault possibly exclusion switch wiring (£5 parts & hour labour) engine light fault could really be anything but lambda sensors & generic misfires(plugs/leads) common on these.