if not equipped with a "B" Switch ont he shifter, try putting it in 2, then back to D when you are at a light. it should start off in 1st gear.

My 1992 300Ce has 1st gear start always.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U