2. Check the ignition switch: Make sure that the ignition switch is functioning correctly. Try turning the key to the "On" position and see if the dashboard lights illuminate. If not, the ignition switch may need to be replaced.
3. Check the starter: Try to crank the engine. If you hear a clicking sound but the engine doesn't turn over, the starter solenoid may be faulty. If you don't hear any sound, the starter motor itself may be the issue.
4. Check the fuel pump: Listen for the fuel pump when you turn the key to the "On" position. If you don't hear the pump running, it may be faulty or the fuel filter may be clogged.
5. Check the security system: If the theft light is coming on, there may be an issue with the vehicle's security system. Try disabling the security system and see if the engine starts.
If you have checked all these items and the engine still doesn't start, it's best to consult with a qualified mechanic or auto electrician who can further diagnose and fix the problem.