It has so far. First I went to Advance Auto because they has the Mercedes (Stant 10845) gas cap in stock. They tried reading the code and their reader just kept saying no link. I was getting nervous because I had just got the car and was thinking the dealer was pulling a fast one on me somehow. I went to Auto Zone and their reader hooked right up and showed the correct code I was thinking (p0455). So all is well so far. I saw the thread where the guy flipped the seal over and it fixed his.