Will a Car Run With a Bad Crank Sensor

One of the most common problems that car owners experience is with the crank sensor. When this sensor detects that the engine has stopped, it sends a signal to the car’s computer, telling it to stop and start up again. If the sensor is faulty, this might not happen properly, and the car might not start at all.

What is a Crank Sensor?

A crank sensor is a device that detects the rotational speed of the engine and sends a signal to the controller. If the sensor detects a problem, it will prevent the engine from running.

How Does a Crank Sensor Work?

A crank sensor is a device that monitors the rotation of the crankshaft. When the engine is running, the sensor sends a signal to the computer, which then determines how fast the engine is rotating. If the sensor detects that something is wrong with the engine, it will send a signal to the computer to stop the engine.

When Should You Replace a Crank Sensor?

If your car won’t start, the first thing you should do is check the battery, fuel filters, and spark plugs. If those are all fine, then you may have a bad crank sensor. A crank sensor tells the engine how hard to turn the crankshaft. If it’s bad, it can cause the engine to not start. In most cases, replacing a crank sensor is a cheap and easy fix. Here are some things to keep in mind when replacing a crank sensor:

– Make sure to get the right part. There are several different types of crank sensors, and each one requires a different replacement procedure.

– Get the correct tools. You’ll need a magnetic pickup tool to remove the old sensor, a ratchet and screwdriver for installing the new one, and some oil or grease to help prevent corrosion.

– Disconnect the negative battery cable before you start work. This will protect your car if something goes wrong.

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– Be careful not to pinch your fingers between the old sensor and the engine block. If this happens, you’ll probably need surgery to remove the finger!

How to Test a Crank Sensor

If your car is not starting, there is a good chance that your crank sensor is bad. A crank sensor measures the rotational speed of the engine, and it sends a signal to the ignition system to start the car. If your sensor is bad, the engine will not turn over properly and the car may not start. Here are four steps you can take to test your crank sensor:

1. Disconnect the battery and wait ten seconds. Reconnect the battery and try starting the car. If it still doesn’t start, your sensor is probably bad.

2. Use a voltmeter to measure the voltage at each spark plug on both cylinders (3, 6, 9). The voltage at spark plug number one should be higher than at spark plug number two. If it’s not, your sensor is probably bad.

3. Start the car and hold down the gas pedal while you press down on the brake pedal as hard as you can. The car should stop within one or two seconds. If it doesn’t, your sensor might be bad.

4. Check for codes related to crank sensors in your car’s computer by using a code reader.


The short answer is that a car will usually still run, but it may not be as efficient as it could be. If your car has a bad crank sensor, the engine will struggle to turn over smoothly and the car may not start. While this problem can usually be fixed relatively easily, it can sometimes lead to other mechanical problems down the road. If you think your car might have a crank sensor issue, don’t hesitate to take it in for inspection.

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