Clearing Codes
Turn ignition off. Remove EFI fuse (20A) for at least 10 seconds. On LS400, EFI fuse (20A) is located in junction block No. 2. This junction block is located in left front engine compartment. Codes can also be cleared by disconnecting negative battery cable.
NOTE:
When disconnecting negative battery cable to clear codes, remember to reset clock and radio memory. After clearing codes, ensure a normal code is shown on CHECK engine light.