Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

hi can anyone please give me some help? my son has a 1998 1.4 gls corsa it seems to run fine but when you start the engine after about a min the engine warning light comes on. when you stop the car and re start it the light has gone but returns again in about a min. any ideas or how can I test the system to show me what fault I am getting to sort this problem.
cheers everyone

Could be anything tbh lambada tps icv afm crankshaft camshaft any of them could be causing it needs the codes read before anything else