When driving to work this morning, the "!" came on and stayed on for 5 minutes, lasting the duration of my morning commute. What does this mean? It was cold, and I didn't give my car time to warm up.

I'm looking at purchasing this car from Carmax and have an appt this afternoon at the Mazda dealership for a complete car inspection.

I keep getting a number 4 cylinder miss fire. I have changed the plugs and switched the coils. I still get the same problem, also I've noticed that there is oil on the number 4 cylinder spark plug treads, is this bad? I just had this motor rebuilt last year with forged internals, please help.