Got a 206 diesel and its knocking like a twat from the rear all the time, gonna jack it up this aft, whats the most likely thing wrong with it? Any common faults I should be looking out for? Sounds suspension to me as it rattles on the slightest bump, its not exhasut fouling on anything, best way to describe it is it sounds like a taxi (not a sapphire, just a regular one )