Hi, My 1993 T4 2.5 petrol van with 98K management light keeps coming on. Engine runs perfectly but bugs me. Started 12 months ago, cold morning flashing light comes on after several minutes, switched off engine when hot, re-start engine no flashing light on. On a warm day this does not happen but now it's getting more frequent and need to be a really warm day for it not to happen. Temp gauge shows ok and have done another 7K miles like this. Any ideas!