The solenoid itself can often become clogged. Also a common product of contaminated oil, solenoid clogging disrupts its ability to control oil pressure. Symptoms of VANOS solenoid failure can include sluggish acceleration, loss of power, limp mode, check engine lights, and a rough idle.

All genuine BMW from my local dealer, Barons of Hindhead. To sum up, be prepared for very cramped work space and absolutely do not use the old T30 torx bolts. Check out the torque figures and stick to them. Most are 6 ft-Lbs, with the exception of the final round plugs that screw into the vanos unit which are approx. 40 ft-lbs.

VANOS allows for two things. Ability to meet emissions and ability to run cams for peak power but maintain smooth idle. On stock setup, you won't encounter valve interference nor piston to valve clearance issues. But tuning it incorrectly could reduce power or torque depending on what you do.
BMW came up with a software "upgrade" for Vanos, which actually is masking the problem, makes the ECU curve bigger. With toast seals. However, IF you get a code and it relates to Vanos, then a simple seal swap is out of the question, because now the pistons ate through the vanos cylinders (metal).
BMW Engine Failure - $15,000 Fix My boyfriend has a 2013 BMW 328XI that had an engine failure due to VANOS faults. The dealership has informed him that he needs a new engine ($15,000 😂😂). He’s had it since 2016 with 100,000 miles. He owes about $5k and pays about $500/month. We’re trying to figure out our options. SST said: I think we have slight difference of interpretation here. The BMW engines are known for their smoothness, yes, but that doesn't mean that they deliver their power with a flat torque curve. Take a look at some dyno charts. 4000 rpm is on the high side when your engine redline is 6500rpm. Introduced by BMW, VANOS is essentially a form of variable valve timing. This system dynamically adjusts the timing of the engine’s intake and exhaust camshafts in relation to the crankshaft. By doing so, VANOS optimizes engine power and torque over a wide range of speeds and operating conditions, while also enhancing fuel efficiency and LC30FT.
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    • how does bmw vanos work