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My Ls400 96 start some time and run fine but when I park it, it will not start for a few day, and it's lose power because I have to reset the radio and clock. The battery good new one and new spark plug wire and plug, ignition coils and it's show a code P1600.Help

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Hi...welcome to the Forum

Code P1600 is quite a serious issue with power supply to the systems. 

I would advise you take it to a good auto electrician to check over. However, a quick check of the battery terminals, earth connections, etc would be the first place to start.

Let us know how you get on with it.

Cheers   Trevor

P1600
Type Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description

Control Module Long Term Memory Reset Conditions

Cause

Key on or engine running, then the PCM detected that there was not battery voltage at the Long Term Memory circuit.

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