I purchased this E550 with the OBD codes p0015, p0022, p0025. These codes have to do with the camshaft timing. This was set straight with a new set of cam magnets and camshaft oil valves. Topped off with fresh oil and filter. This E550 was well taken care off and it still needs love. If you are not into working on your own cars don't buy one off these, they will hurt the pocket book.