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I had to replace both vanos solenoids. Best way to check if they are causing issues is to find a reasonably steep road and put the car into 3rd or 4th gear at around 2k rpm and go wot. If it's vanos the car will oscillate and throw a code after about 3-5 seconds. It feels like micro second interruptions in the power band. If it does throw vanos codes just replace them both. Not worth messing around and cleaning etc. Cleaning doesn't fix it for long. Buy them online from ecs and install yourself to save a lot of money.
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