If your car won’t start, the problem is usually connected to the battery, starter, fuel delivery, or ignition system. In many cases, a weak or dead battery is the most common cause, especially if the engine won’t crank or you hear a clicking sound when turning the key. Corrosion on the battery terminals can also prevent proper electrical flow and should be inspected closely.
If the battery checks out, the next area to focus on is the starter motor and fuel system. A faulty starter may prevent the engine from turning over, while a failing fuel pump can stop fuel from reaching the engine entirely. Because modern vehicles rely heavily on sensors and electronics, scanning for diagnostic trouble codes can provide a much faster answer.
A factory service manual is the best resource for this repair because it includes complete wiring diagrams and manufacturer troubleshooting procedures for your exact vehicle.