Check engine light code p1299 coolant under the upper intake mainfold

Question

some how there was coolant in engine comparment under the upper intake manifold.

Answer 1

P1299 Cylinder head temperature sensor

This is common seen what happens is the intake gasket rips and breaks at the side and as a result coolant enter in the intake, Just to get to the cylinder head temperature sensor you replace the gasket and make sure the intake if its the plastic one trash it.they crack on the side.