In this video, we discuss some common problems that owners of the BMW N55 engine may encounter. While this engine is known for its high performance, it does have some weak spots that can lead to issues if not detected and addressed early enough.
Common N55 issues.
Valve cover gasket, oil filter housing gasket, and oil pan gasket can all leak oil, which can cause a fire hazard. Keep an eye out for signs of oil seeping out and get them repaired promptly.
High Pressure Fuel Pump problems (HPFP) early pumps often failed, even some later ones still had issues despite revisions.
Electric water pump can fail, causing cooling issues and potential overheating. Keep an eye on coolant levels and get any leaks investigated and repaired.
Wastegate arm or actuator can wear out, leading to turbo rattle and Boost issues. Address any rattles before they escalate into a bigger problem.
PCV (crankcase valve) can lead to high oil consumption issues. If you notice the engine is consuming a lot of oil, the PCV could be the culprit.
Injector problems can occur around 50,000 miles. Get them checked for efficiency and consider replacing them around this mileage.
Carbon buildup can occur on the intake valves due to direct injection, which can hamper airflow and cause power loss. Get it inspected and professionally cleaned to prevent buildup from becoming an issue.
Firstly, the engine uses an electric water pump which is a great system, but coolant leak problems can occur and lead to overheating. Keep an eye on your temperatures and address any fluctuations as soon as possible.
The wastegate arm or actuator can wear over time and lead to a rattle from the turbo's wastegate. This should be investigated and addressed early to avoid further damage.
The PCV valve can cause high oil consumption if it's not functioning correctly, leading to other issues down the line.
Injector problems tend to occur at around 50,000 miles, so get them checked for efficiency and consider upgrading the fuel system if you're planning on tuning the engine.
Direct injection engines like the N55 are prone to carbon buildup on the intake, leading to reduced power. If you suspect this is becoming an issue, get it inspected and cleaned by a professional.
While these issues may seem daunting, they can often be avoided or minimized by detecting them early enough. So keep an eye on your engine's performance and get any issues checked out as soon as possible to keep your N55 running smoothly.
The following cars came with the N55 engine: 2009–2017 F10/F11/F07 535i, 2010–2013 E90/E91/E92/E93 335i, 2010–2013 E82/E88 135i, 2010–2017 F25 X3 xDrive35i, 2011–2013 E70 X5 xDrive35i, 2011–2015 F30/F31 335i, 2011–2014 E71 X6 xDrive35i, 2012–2015 E84 X1 xDrive35i, 2013–2016 F32/F33/F36 435i, 2014–2018 F15 X5 xDrive35i, 2014–2019 F16 X6 xDrive35i, and 2014–2016 F26 X4 xDrive35i.
The N55 engine also has applications in various models such as the 2011–2018 F06/F12/F13 640i, 2012–2013 E82/E88 135is, 2012–2015 F20/F21 M135i, and 2012–2015 F01/F02 740i/Li.
Additionally, Alpina has developed its own versions based on the N55 engine, including the 301 kW version used in the Alpina F30 B3 Bi-Turbo and Alpina F33/F34 B4 Bi-Turbo, the 324 kW version in the Alpina F30/F31 B3 S Bi-Turbo and Alpina F32/F33 B4 S Bi-Turbo, and the 332 kW version in the Alpina F32/F33 B4 S Bi-Turbo Edition 99.
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Legal Notice: Unless we have inspected your car we can only provide generic theory. All information is provided without warranty, please check any recommendations made with a mechanic locally to verify it would be legal in your area or region and that it would be suitable for your car and your needs.
