I had a P400e for 5 years, mainly due to my L460 taking 18 months to arrive. The only problem I had was towards the 4th year it didn't use the electric drive very often, which I found was down to a low voltage in the 12v battery. If you buy one, make sure the 12v is new or recently replaced as otherwise you will find your fuel economy poor and the car feeling very underpowered.
Otherwise the car was excellent and I thought the drivetrain setup was generally very good. I did most of my miles on the battery as my daily journeys were less than 10 miles.
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