How to Start a Car with a Bad Crankshaft Sensor

When your car’s crankshaft sensor goes bad, it can be frustrating and costly to replace. However, there are some things you can do to start your car even with a faulty sensor. In this article, we will look at some solutions on how to start a car with a bad crankshaft sensor.

What is a Crankshaft Sensor?

A crankshaft sensor is an electronic device that is responsible for monitoring the position and speed of the crankshaft in your car’s engine. This information is then sent to the car’s computer, which uses it to adjust the fuel injection and ignition timing. When the sensor goes bad, the engine may not start or may run poorly.

Signs of a Bad Crankshaft Sensor

The following are some signs that your car’s crankshaft sensor may be bad:

  • The engine won’t start or is hard to start
  • The engine stalls or runs rough
  • The car’s computer sends error codes related to the crankshaft sensor

How to Start a Car with a Bad Crankshaft Sensor

If you are in a situation where your car won’t start due to a bad crankshaft sensor, there are some things you can do to get it running. Here are some solutions:

1. Check the Battery

The first thing you should do is check the battery. A weak or dead battery can cause the engine to crank slowly or not at all, which can be mistaken for a bad crankshaft sensor. If the battery is weak or dead, try jump-starting the car or replacing the battery.

2. Check the Wiring

The wiring that connects the crankshaft sensor to the car’s computer can become damaged or loose over time. Check the wiring for any signs of damage or looseness. If you find any issues, repair or replace the wiring as necessary.

3. Tap the Sensor

Believe it or not, tapping the crankshaft sensor can sometimes help it start working again. Use a small hammer or similar tool to gently tap the sensor a few times. Then try starting the engine again to see if it worked.

4. Use Starting Fluid

If tapping the sensor doesn’t work, you can try using starting fluid. Starting fluid is a spray that is designed to help start engines. Spray a small amount of starting fluid into the air intake while cranking the engine. This can help get the engine started even with a bad crankshaft sensor.

5. Replace the Sensor

If none of the above solutions work, you may need to replace the crankshaft sensor. This can be a costly repair, but it is necessary to get your car running properly again. Take your car to a mechanic or do it yourself if you have the knowledge and tools.


Dealing with a bad crankshaft sensor can be frustrating, but there are some things you can do to get your car running again. Check the battery and wiring, tap the sensor, use starting fluid, or replace the sensor if necessary. With these solutions, you can start your car even with a bad crankshaft sensor.