after you take out the solenoids...theres an O ring sitting inside the hole. Per bentley manual, you should replace them but they looked fine so i just left them inside. Make sure when you reinstall the vanos that the O rings are still there and it didnt fall off
i clean them with carburator cleaners, used the tiny straw and spray right inside the hole from the top of the solenoid ( becareful the spray might bounce back, wear glasses...etc). Shit started to come out of the hole. I swap the two and clear the P1553 generic code.
(edit) CEL havent come back after a month...so everything is good
added some more info
2006 325xi (Sold)
2014 M235I (Current)
2015 428xi Gran Coupe (STB)
Last edited by ska///235i; 04-12-2012 at 03:56 PM.