Q: Why did my car have to sit and idle in the shop for 2.5 hrs?

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I put my car in the shop (Mercedes-Benz delearship service) today and had the following work done: REPLACE TIRE PRESSURE MONITOR SENSOR. When I dropped the car off in the morning, the elapsed time clock read 0:30 (thirty minutes running time). As you know, this clock resets itself to zero after four hours of non-operation. When I picked the car up this afternoon, the elapsed time clock read 3:05 (three hours and 5 minutes). Why did my car have to sit and idle for 2.5 hours to replace this sensor?

Thanks...

Tom

My car has 124467 miles.
My car has an automatic transmission.

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