How do you replace a fuel injector on a Lexus ls400?

To replace a fuel injector on a Lexus LS400, first, disconnect the battery and relieve the fuel pressure by loosening the fuel filler cap and removing the fuel pump relay. Next, remove the intake manifold to access the fuel rail, then detach the fuel rail and disconnect the electrical connectors from the injectors. Replace the old injector with the new one, ensuring proper sealing, and reassemble by reversing the disassembly steps. Finally, reconnect the battery, check for leaks, and ensure the engine runs smoothly.