Yes last month I changed the EGR and cooler but was running fine for a full month.Ok, so the engine is mechanically sound.
Like @Craig B has said. You might need a better diagnostic machine. Seems strange there are no codes stored considering the coil light was on.
Is there any history of recent repairs or problems with the van?
It shouldn't be the immobiliser as that won't cause the engine to breakdown when it's running. Once running, you can throw the chipped key away