For work on the camshaft adjuster solenoids, extreme cleanliness must be ensured as even slight impurities can result in failure. The camshaft adjustment solenoids for the intake and exhaust camshafts differ only in terms of the position of the fastening point by which they are fixed to the cylinder head cover.
If a fault is detected in the camshaft adjustment solenoids, the solenoids are no longer actuated.