I bought a Peugeot 407 1.6HDi SE three weeks ago. Since then I have
returned to the car on two occasions only to get the symptoms of a
flat battery when attempting to start. On the first occasion the AA
used their power pack to start it. On the second occasion an obliging
Fiat Punto owner provided starting power.
The alternator is turning out 14.5v and the car can run with the
headlamps on immediately following these failures. On both occasions
the car has been sitting for 20 minutes. Both occasions have been
preceded by long runs each within a day of the failure.
It might be the battery as the car has done 43,000 miles and is 3
years and 4 months old. Has anyone got other ideas? Is there any known
problem with the Peugeot 407 1.6HDi that can drain the battery when
the car is parked?
The car is going back into the garage for the last chance fix before I
demand a refund. They have had one crack at it already. The car needed
a Starter Pack to get it started when I viewed it. I should have
knocked it back then! There were also two missing TPMS tyre valves
which escaped their pre-sale check despite the loud warning. They have
fixed this.

Thanks,
David Rocke