Very doubtful. The Engine Computer uses readings from the coolant temperature sensor to know when to turn on the electric radiator fan, (for vehicles that use them), when to engage the transmission's lock-up torque converter, and to a small extend, to increase idle speed when the engine is cold and the fuel doesn't vaporize well. (It needs to be a vapor to burn. Liquid fuel won't burn). It is extremely rare for a temperature sensor to fail because there's just one component inside them. Much more trouble is caused by corroded connector terminals and wiring problems.
If a coolant temperature sensor were to read a temperature lower than actual, but smooth and steady, the symptom would be slightly high idle speed, but engine power would be normal. With a vacuum leak, you don't get extra power to match the higher speed. (A mechanic would make this observation by how far he has to push the accelerator pedal to get the vehicle moving).
Wednesday, March 22nd, 2017 AT 6:50 PM