The remote functionality for one of the keys for my 98 E300 doesn't work....never has in the 2-1/2 years I've owned the car. So I simply use the mechanical key. Not a huge deal since it's a spare key (my son has the working key), but I was curious to find out if there's any possible way that the remote function can be brought back to life. (Yes, I've replaced the batteries.)

I haven't tried contact cleaner yet...or seeing what can be taken apart and put back together.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife