General
VANOS
BMW's variable valve timing system. Adjusts cam timing for optimal performance.
Why it matters
VANOS faults cause rough idle, power loss, and poor throttle response. Worn VANOS solenoids are common on high-mileage BMWs.
What to look for
VANOS position deviation from target. Sluggish response or oscillation indicates solenoid or actuator wear.
Related terms
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