The boost sensor is responsible for monitoring the pressure of the air entering the engine. If the boost sensor fails, it can send an incorrect signal to the engine control unit (ECU), which can then prevent the engine from starting as a safety precaution.
This is because the ECU relies on the boost sensor to determine how much air is entering the engine, and it uses this information to calculate the correct amount of fuel to inject. If the boost sensor sends an incorrect signal, the ECU may inject too much or too little fuel, which can cause the engine to stall or run roughly.
In some cases, a faulty boost sensor can also cause the engine to run in limp mode, which is a reduced power mode that is designed to protect the engine from damage.
