My 2006 Kia optima starts fine then after 3 seconds it turn off. Is this a oil pressure sensing unit gone out? It does not choke out or sputter. It dies like when u turn the car off. I thinking it is a fail safe switch. I don't know anyone with a scan tool to check historic codes. I haven't got a repair manual for it. We just got the car a week ago. Pertty clean car fax.