I have a 1999 honda civic ex which has 165,000 miles. Within the last few months the car will shutoff while driving. I have no power steering, nothing. I have to pull the car to side of the road and put the car in nuetral to start. Sometimes it will start right away and other times it will take about 5 to 10 turns of the ignition. I brought it to the mechanic and he replaced the battery and battery end and the coalate temp sensor. Work fine for a few days and then the same thing happened. Any suggestions?

Try the coil or the solenoid.

It could be a coil or solenoid.

I would call yourlocal honda dealer with you vin # handy
And see if your car is a part of the 02-031 honda recall
Service bulletin. Which involves your ignition switch.

Replace the ignitor and coil:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563-4.html#post265896