2007 Peugeot 407 Pricing and Specs

Peugeots of this era were not known for the high standard of their electrical systems. Even when new, they gave trouble, in fact. But to find your problem, here’s my first question: Have you altered or added anything to the car that runs on electricity? This could be a new stereo head unit, amplifier, extra gauges to monitor the engine, auxiliary lights or even a sat-nav or dash-cam system. Any of these additions could be somehow remaining powered-up when you lock and leave the car each day, flattening the battery overnight.

Does the car have an alarm system? These are notorious for draining batteries and older ones especially so. Have you checked things like the light in the boot? If this stays on due to a faulty micro-switch, you could easily have a flat battery next morning. Find a dark place to park the car and then have a good look around it for any signs of a light stuck on somewhere.

In some cases, you might find the cause of the problem is the body computer which is randomly switching on various systems (including even the headlights) when you’re not looking. By the time you go to the car next morning, the lights are off because the battery is completely flat.

YOU can save money by buying at particular times, but it isn't necessarily the same for all makes and models. If you were buying a Toyota, Ford or Holden the times you mention are best, but that doesn't apply to Peugeot. As a relatively small-volume make in Australia, I don't believe there is a particular time to buy a Peugeot, but I would look at the run-out phase before, or just after the introduction of a new model.