Any similar experience ? Any advice ? Bought a Prius two weeks ago. Three days ago it showed engine check light, so took it to the dealer. Service dept diagnosed it as an engine coolant sensor failure (he said it was a sensor that senses when the temperature is very low and takes some action.) and he has ordered the part which will take one week to receive. He rebooted the computer in the car to get rid of the light and and said that the car is driveable and to ignore the engine check light if it ever came back on again. The failed sensor would not affect any other systems. BTW, it has been hot last few days. Yesterday, the gas engine just stopped while driving. The brake, engine check and a red triangle came on and display said "problem". Luckily I was near home and the car drove on the battery power but drained pretty fast to empty by the time I got home, around 1/2 mile. I turned the car off and on and the gas engine was dead, and the same warning lights came on. Called the dealer today, had the car towed in. This morning at home, the gas engine was dead and it still flashed the same warning lights when I backed off and loaded the car on the tow on battery power. However, when I got to the dealer and unloaded the car and turned it on to drive a few feet, the gas engine was now working with only engine check warning light on. I turned the engine off/on once more and now there were no warning lights at all. Have left it at the dealer's for tests and the replacement of the sensor when it comes in. Any similar experience ? Any advice ?