Why will 2002 Chevy Impala turn over but will not start?

A 2002 Chevy Impala that turns over but won't start may have several issues. Common causes include a faulty fuel pump preventing fuel delivery, a dead battery or poor connections affecting electrical power, or a malfunctioning ignition system, such as worn spark plugs or a faulty ignition coil. Additionally, problems with the engine's sensors, like the crankshaft position sensor, can also lead to starting issues. Diagnosing the problem typically requires checking fuel pressure, spark, and error codes from the vehicle's computer.