BMW N55 Engine Problems: What Goes Wrong and What to Do About ItThe BMW N55 engine powers some of the most popular performance BMWs of the last decade: the 135i, 235i, 335i, 435i, 535i, M135i, M235i, and the first-generation F87 M2, along with xDrive X-series models including the X3, X4, X5, and X6 in 35i specification. It replaced the N54 from 2009 and is widely considered a more reliable engine, but it has its own fault patterns that every owner should know about.In this episode of Under the Hood by MT Auto Parts, we go through each significant N55 issue in detail. We cover the valve cover gasket and oil filter housing gasket leaks that commonly develop between 60,000 and 100,000 miles, the burning smell that's often the first sign, and why addressing both together is the sensible approach. We explain the electric water pump, why it was designed the way it was, why it fails without gradual warning, what happens to the engine if you miss it, and why the temperature gauge is the most important thing to watch on any N55 over 80,000 miles. We cover the high-pressure fuel pump symptoms, the plastic charge pipe that cracks under sustained boost pressure and why an aluminium replacement is considered a standard reliability upgrade, and the wastegate rattle, what it sounds like, what causes it, and when it's something to monitor versus something to act on.We finish with a clear buying guide for anyone considering a used N55-powered BMW, what to ask, what to check on the test drive, and what to budget for if the known service items haven't been done.MT Auto Parts stocks genuine used BMW engines and engine parts for 2012+ BMWs, with donor mileage documented on every listing and a 30-day warranty as standard. Send your registration on WhatsApp for a fast availability check. Browse BMW parts at mtautoparts.com.