The BMW E90 delivers solid performance and even power thanks to its VANOS system. This tech tweaks camshaft timing for top efficiency. But failing VANOS solenoids cut engine power fast. Spot signs early to dodge big repair bills and keep your BMW sharp.

A top sign of bad VANOS solenoids is rough idle. Your E90 might shake or rattle at stops if valves time wrong. Poor acceleration hits next. The car feels lazy, slow to surge on gas.

Failing solenoids light up check engine lights too. Codes like P0012 or P0015 pop for timing faults. Fuel use climbs as the engine strains with bad timing.

You might lose power at low RPMs. VANOS builds low-end torque, so faults make it weak and choppy. The car could hit limp mode to guard the motor.

Engine stalling or tough starts happen with big timing slips. Ignore it, and parts wear out quicker.

Lucky for E90 owners, VANOS solenoids swap out cheap and simple versus other BMW bits. Dirty oil often clogs them. Fresh synthetic oil changes stop gunk and boost their life.

See rough idle, weak pickup, lights, low power, or bad mileage? Get a German car pro to check it.

Fix VANOS issues soon for smooth runs, better gas, and longer engine life on your E90.