1. Low oil pressure: If the oil pressure is too low, the engine will not get the lubrication it needs to start and run properly. Check the oil level and add more if necessary. You may also need to change the oil filter if it is clogged.
2. Faulty starter: The starter is responsible for turning over the engine when you turn the key. If the starter is faulty, it will not be able to engage the flywheel and start the engine. Try tapping the starter with a hammer while someone else turns the key. If the engine starts, the starter may be loose or damaged and will need to be repaired or replaced.
3. Weak battery: A weak battery may not have enough power to start the engine. Check the battery terminals to make sure they are clean and tight. You may also need to have the battery tested to see if it needs to be replaced.
4. Faulty ignition switch: The ignition switch sends the signal to the starter to turn over the engine. If the ignition switch is faulty, it may not be able to send the signal properly, causing the engine to not start. Try turning the key back and forth a few times to see if the engine starts. If it does, the ignition switch may be worn out and will need to be replaced.
If you are not able to identify the problem yourself, you may need to take your car to a mechanic for further diagnosis and repair.
