My 2014 Hyundai Tucson the engine got stuck, the engine oil get muddy and the car stopped and doesn't start. I removed the engine belt and try to turn the engine by turning the crankshaft with 22 mm spanner and nothing happen.
Please I would like to know if there is any sensor that stops the engine to protect them or I will have to take the engine out and do a complete repair?
If there was a sensor to stop the engine, it would most likely cut the ignition to prevent it from running, not lock it from turning.
What you have described sounds like the engine was starved of lubrication resulting in bearing seizure, or worse. You will need to break it down to find the fault.
Muddy oil indicates coolant has gotten into the oil caused by a headgasket failure. Depending on the severity of the leak in the headgasket you may have either starved bearings and cylinder walls of lubrication, or had a lack of proper cooling- either of which could have caused a seized engine. It probably won't be cost effective to rebuild this engine if it won't rotate.
