One thing that you can try is to leave the key on with a battery charger hooked up and a fan blowing on the engine to cool it down. I do not know what year model you have but some of the very early 850's would clear the monitors when you shut the car off. So, if you leave the key on and cool it down enought to get it back into the proper range to start the drive cycle it will retain the information from the previous cycle. I hate doing drive cycles on the early 850, the factory pays you 3 hours warrantee time and I have had customers that drove their car for weeks without resetting the monitors. I know, I am a regular ray of sunshine. Good Luck

Mark