Hi. My car is a 2002 C200 kompressor. W203. My problem is when I put the key into the ignition it doesn’t always unlock the ignition/steering. Sometimes it’ll work second or third time but other times I can put the key in and out 20 or 30 times before the solenoid clicks. I’ve tested the battery and it’s producing over 12 volts. Is it the key or the ignition switch that is faulty? Thanks in advance for any light you can shine on this problem.