Originally Posted by scflaw
how hard is it to replace the solenoid and how much should the part cost.
Solenoids are easy to replace since they are on top attached to the engine (passenger side). electric plug, a couple of vacuum line and that's it.
they go for 91$ each at Tischer.
it's part number 4:
SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555
'10 E92 335i M, 6MT COBB v3, ER IC, ER CP, VRSF DP, Fuel-it st2
installing soon: Mfactory LSD, , powerflex subrframe bushings