How do you replace the fuel injectors in a 2004 Saturn Ion?

To replace the fuel injectors in a 2004 Saturn Ion, first, relieve the fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls. Next, disconnect the negative battery cable and remove the intake manifold to access the injectors. Carefully disconnect the electrical connectors and fuel lines from each injector, then remove the old injectors from the rail. Install the new injectors, ensuring proper seating and connection, reassemble the intake manifold, and reconnect the battery before starting the engine.