I have a 91 300E 4Matic with 82k miles. The 4Matic indicator light (the one that tells you that you are in 4wd) comes on intermittently. There does not seem to be a pattern as to when this occurs. It it happens at different speeds, temps etc. The 4Matic problem light (on the bottom of the display) does not come (unless you disable 4Matic with the switch under the hood). This car is new to me and so far I have only driven it on dry roads at normal speeds, so I don't think that the 4wd should be engaging. I checked the tires and they are Pirelli P6000 (195/65R15 - N1) with about 60% tread. These are the correct size according to the owners manual. My independent MB mechanic checked for trouble codes and found none. My guess is that I have a sensor that is malfunctioning, but I'm not really sure where to start. Any help will be appreciated.
02 E320 4Matic
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99 SLK 230