1. Battery: Check the battery to make sure it has enough charge. If the battery is weak or dead, it may not have enough power to start the engine.
2. Starter: The starter may be malfunctioning or damaged. If the starter is not working properly, it will not be able to engage the engine and start it.
3. Fuel System: Check the fuel system to make sure that fuel is getting to the engine. This includes checking the fuel lines, fuel filter, and fuel pump. If there is a problem with the fuel system, it may not be able to deliver enough fuel to the engine to start it.
4. Ignition System: Check the ignition system to make sure that it is working properly. This includes checking the spark plugs, spark plug wires, distributor cap, and ignition coil. If there is a problem with the ignition system, it may not be able to provide the necessary spark to start the engine.
5. Engine Mechanical Issues: There may be a mechanical problem with the engine itself that is preventing it from starting. This could include problems with the pistons, rings, valves, or crankshaft. If there is a mechanical problem, it will need to be diagnosed and repaired by a qualified mechanic.
If you are not able to identify and fix the problem yourself, it is best to have your car towed to a qualified mechanic for diagnosis and repair.