These solenoids commonly fail every 70,000 miles or so.
Understanding VANOS is rather complicated, although you can read our full guide about it here.įailing VANOS solenoids will result in a loss of power, poor idling, bad fuel economy, trouble starting, and the occasional limp mode. The VANOS solenoids are responsible for controlling how much oil flows to the cam gears, which in turn controls the opening and closing of the valves. The BMW N52 engine uses BMW's VANOS system, which is a variable valve timing system. This results in the affected window not being to roll up or down. However, I will mention one other common, non-engine-related issue is the window regulators. These are the most common engine problems, outside of these problems the car is very reliable and problem free. If you would rather consume this content via a video, check out our BMW N52 Common Problems video below or on YouTube: We also wrote an N54 engine problems guide you can read to compare the two! Because the N52 doesn't have an HPFP or direct injection, these are two common N54 issues that drivers of the N52 won't have to worry about. We're going to address the 7 most frequent engine issues the N52 experiences.ĭue to the engine design, the BMW N52 has proved more reliable than its bigger brother, the N54.
However, the N52 still has its fair share of common reliability problems. The engine even won a spot on the Ward's Top 10 Best Engines list in both 20. Given the long production history, BMW was able to perfect many aspects of the engine over the production lifetime. It is the successor to the M54 which was used in various E36, E39, and E46 models.
The N52 was produced from 2004 until 2015 when it was replaced by the turbocharged N20 engine. The N52 was predominately found in the E90 325i, 328i, 330i, and the E60 525i and 528i models, as well as various others such as the 128i, X1, and Z4, to name a few. BMW's N52 engine is one of its most successful, and most produced inline-6 engines.
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