Check engine light come on car not running hot plenty of coolant in it guy at auto zone coolant might be low or senor could be going out.

Hello, If the man at Autozone used a scanner for your car, then the problem was identified and you need to follow up on the possible repairs.

The low coolant level can be temporarily fixed by adding coolant to the proper reservoir under the hood. You would need to add the proper Antifreeze to the car and see if the "check light" stays off after the man scans and clears the onboard computer. You could also instead disconnect the NEG Battery cable for 10 minutes to allow the car to Reset itself. The reason I indicated a temporary cure by adding more coolant is that the original coolant went somewhere. If the coolant level goes down again you need to have a Radiator place check your system for leaks. The coolant level can change when the engine heats up so you would need to look at the reservoir after the engine is hot and while it is running.

The car does also have water sensors and the autoparts guy was correct if the scanner tool he used indicated the sensor was going bad. The sensor is reasonably priced, there can be 2 in the car and they work independent of each other. One sensor operates the dash guage and the other sensor operates the engine controls including when the cooling fans come on for the engine. The sensors are small, about the size of your Thumb's first joint.

I hope my solution is very helpful in explaining what you need to do.