Try resetting the computers. Take all power off the car via the battery for 15 minutes, then reapply and I'll bet you will see things have reset. Just make sure you know the radio code!! Works wonders for my W140 when things seem wierd!

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1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold