Auto Parts: 1996 328i convertible, coolant level, engine coolant

Question
The check engine coolant message keeps coming on after I have had EVERYTHING (hair pin leak, corrosion, etc. fixed that we could find. How do I reset the control warning.

Answer
    If the warning is part of your OBDII system, then you will need a scan tool to erase the warning.  Every mechanic out there has one of these.  If it is a separate light on the dash just for the coolant level, then there is still a problem.  The most common problem with the coolant light is for the sender in the reservoir to go bad or somehow come unplugged.  Usually it's a bad sender.