1. Test the battery. Even though you just put in a new battery, it's still possible that it isn't providing enough power to start the car. Use a multimeter to test the battery voltage and ensure that it is within the recommended range. If the battery voltage is low, try jump-starting the car.
2. Check the fuel system. Make sure there is fuel in the tank and that the fuel lines are not blocked or clogged. If the fuel lines are clogged, you may need to clean them out or replace them.
3. Inspect the spark plugs. Remove the spark plugs and check them for wear, corrosion, or damage. If the spark plugs are worn or damaged, replace them with new ones.
4. Check the ignition wires. Inspect the ignition wires for damage or cracks. If the ignition wires are damaged, replace them with new ones.
5. Clean the throttle body. If the throttle body is dirty, it can prevent the engine from getting the air it needs to start. Remove the throttle body and clean it with a throttle body cleaner.
6. Check the starter. If the starter is not working, the car will not be able to start. Try turning the key to the "On" position and listening for the sound of the starter engaging. If you don't hear anything, the starter may be faulty.
7. Check the alternator. The alternator is responsible for charging the battery. If the alternator is not working, the battery will not be charged and the car will not be able to start. Try driving the car for a short distance and then turning off the engine. If the battery is not charged, the alternator may be faulty.
8. Have the car towed to a mechanic. If you have tried all of the above steps and the car still will not start, you should have it towed to a mechanic for further diagnosis and repair.
