What should I look for in a used Peugeot 407 saloon?
Be more careful with a diesel than a petrol. We've heard only isolated reports of trouble with the HDi models and most will have been dealt with under warranty by the time they hit the used market. However, watch out for diesels that rev roughly or are lumpy at idle. Problems with the exhaust gas recirculation (EGR) valve, a sticky throttle and faulty injectors may be to blame. Blown turbos aren't unknown, either.
There's no point touching a car without a full service history. There are so many ex-fleet 407s, which will have been maintained properly, that it just isn't worth risking a potentially neglected car for the sake of saving a couple of hundred pounds on the purchase price.
Peugeot upped its game for the 407 and the good build quality shows it. So if there are rattles in the cabin or uneven panel fit, look for evidence of accident damage, or just walk away.