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The main long term electrical issue with the 407 is the Rear light cluster earth problem.
This guide tells you everything you need to know:
www.407owners.com/docs/rearlightbulbsold.pdf
Other than that its just general wear and tear with age.
The display fades and breaks up after about 8 years.
The wiring loom to the engine cool fan can fail. Its used far heavier because of the DPF regenerations and burns out over time.
ABS sensors can cause a problem as rust and grime pushes them away from the hub.
Thankfully all are pretty cheap easy fixes and very well documented. There's a great community of 407 owners on their forum.
The problems I generally see are man-made. People have bodged things in order to sell the car because they can't be bothered spending money on maintenance - mainly centered around topping up the DPF additive tank.
If you're looking for problems when the car was released, I think VOSA have a recalls page on their website:
www.gov.uk/check-if-a-vehicle-has-been-recalled
Edited by Gibbo_Wirral on 15/07/2015 at 14:45
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