If a crankshaft sensor is bad what problems does it create?

1. Engine Misfires: A faulty crankshaft sensor can cause the engine to misfire, as the ignition timing will be incorrect. This can lead to rough idling, hesitation during acceleration, and a decrease in engine power.

2. Engine Stalling: In some cases, a bad crankshaft sensor can cause the engine to stall. This is because the sensor is unable to provide the engine control unit (ECU) with the necessary information to keep the engine running smoothly.

3. Difficulty Starting: A faulty crankshaft sensor can also make it difficult for the engine to start. This is because the sensor is unable to provide the ECU with the necessary information to properly control the fuel injection and ignition timing.

4. Check Engine Light: A faulty crankshaft sensor will typically illuminate the check engine light. This is because the sensor is part of the engine management system, and any problems with the sensor will be detected by the ECU.

5. Fuel Efficiency: A bad crankshaft sensor can also lead to decreased fuel efficiency. This is because the sensor is unable to provide the ECU with the necessary information to properly control the fuel injection, leading to an inefficient combustion process.

6. Emissions: A faulty crankshaft sensor can also lead to increased emissions. This is because the sensor is unable to provide the ECU with the necessary information to properly control the emissions control system.