Q: I need the location of the cylinder head sensor to replace on my 2012 Ford Mustang because of my P1299 code

Hello. The P1299 code does not mean that you need the cylinder head temperature sensor. The sensor only detects temperature and will not affect how the engine is overheating. The fact that you are getting this code is because you have an overheating problem. The overheating needs to be repaired prior to anything else. I would not worry about replacing the sensor. If you need to have this diagnosed, consider YourMechanic, as a certified mechanic can come to you to [diagnose why it is overheating] https://www.yourmechanic.com/services/car-is-overheating-inspection