Possible reasons for the engine not starting and electrical problems:
1. Battery problems
*Dead battery
*Corrosion on terminals
* Faulty terminal connection
2. Problems with the ignition system
* Faulty spark plugs or ignition coils
* Faulty crankshaft or camshaft position sensor
*Faulty Engine Control Module (ECM)
3. Problems with the fuel system
* Clogged fuel filter
* Faulty fuel pump
* Faulty injectors
4. Problems with the electrical system
*Blown fuses or relays
* Breaks in wiring
* Faulty generator or starter
5. Other problems
* Faulty ignition switch
* Faulty immobilizer
* Faulty fuse box
Diagnostics and repair:
1. Check the battery: Measure the battery voltage with a multimeter. If the voltage is below 12.6 V, charge or replace the battery. Clean the battery terminals and check that they are securely connected.
2. Check the ignition system: Remove and inspect the spark plugs. Replace them if they are worn or damaged. Check the ignition coils for spark.
3. Check the fuel system: Replace the fuel filter if it is longer than recommended. Test the fuel pump by connecting a pressure gauge to it and making sure it is providing sufficient fuel pressure.
4. Check the electrical system: Check fuses and relays for burnout. Inspect the wiring for breaks or damage. Check the alternator and starter with a multimeter.
5. Have the vehicle towed to a body shop: If you cannot identify and fix the problem yourself, have the vehicle towed to a body shop for professional diagnosis and repair.