## Car Won’t Start and Check Engine Light Is On
When your car won’t start and the check engine light is illuminated, it can be a frustrating and confusing experience. The good news is that there are several common causes that can be easily diagnosed and fixed.
### Common Causes
**1. Dead or Weak Battery**
A battery that has lost its charge will not be able to provide enough power to start your car. This is especially common in cold weather.
**Solution:** Check the battery terminals to ensure they are clean and tight. If they are loose or corroded, clean them with a wire brush. You can also try jump-starting your car or replacing the battery.
**2. Faulty Starter**
The starter motor is responsible for turning the engine over to start it. A faulty starter can prevent the engine from cranking.
**Solution:** Have the starter checked by a mechanic. If it is faulty, it will need to be replaced.
**3. Ignition Switch Problems**
The ignition switch connects the battery to the starter and sends a signal to the starter to crank the engine. A faulty ignition switch can prevent the starter from receiving power.
**Solution:** Check the ignition switch terminals to ensure they are clean and tight. If they are loose or corroded, clean them with a wire brush. You can also try replacing the ignition switch.
**4. Faulty Fuel Pump**
The fuel pump supplies fuel to the engine. A faulty fuel pump can prevent the engine from getting the fuel it needs to start.
**Solution:** Have the fuel pump checked by a mechanic. If it is faulty, it will need to be replaced.
**5. Clogged Fuel Filter**
The fuel filter prevents dirt and other contaminants from entering the fuel system. A clogged fuel filter can restrict the flow of fuel and prevent the engine from starting.
**Solution:** Replace the fuel filter.
**6. Faulty Alternator**
The alternator charges the battery while the engine is running. A faulty alternator can prevent the battery from charging and will eventually cause the battery to die.
**Solution:** Have the alternator checked by a mechanic. If it is faulty, it will need to be replaced.
### Other Possible Causes
In addition to the common causes listed above, there are a number of other factors that can cause a car to not start and illuminate the check engine light. These include:
* Faulty spark plugs or wires
* Broken timing belt or chain
* Faulty ignition coil
* Clogged catalytic converter
* Faulty oxygen sensor
* Engine damage
If you have tried the solutions above and your car still won’t start, you should take it to a mechanic for diagnosis.
### Troubleshooting Tips
Here are a few troubleshooting tips to help you diagnose the problem if your car won’t start and the check engine light is on:
* Check the battery terminals for corrosion or loose connections.
* Try to start the car in neutral.
* Listen for any unusual noises when you turn the key.
* Check the fuel level.
* Check for any leaks or broken hoses.
If you are not able to diagnose the problem yourself, you should take your car to a mechanic for further diagnosis and repair.
