How do you replace the ignition coils on a 1999 Infiniti Q45?

To replace the ignition coils on a 1999 Infiniti Q45, first, disconnect the negative battery terminal to ensure safety. Remove the engine cover and then unplug the electrical connectors from the ignition coils. Unscrew the bolts securing the coils and carefully pull them out. Install the new coils by reversing the process: seat them properly, secure with bolts, reconnect the electrical connectors, and replace the engine cover before reconnecting the battery.