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Yep, 97 was the first year for the RFID chip key for the W202 , W210 and R129. What is your build date?
You should have a black / chrome antenna ring around the ignition lock, the has a small black wire that leads to a 3 x 4" black box behind the instrument cluster. This box reads the key then sends a message to the engine computer to let the car run. The chip key / black box and engine computer are all programmed together, swap one and the car won't continue to run.
Also know, a new code gets written into the key after each start attempt. A weak cranking battery can disrupt the write sequence and that key will no longer work.
The black box looks like this, the chip in the remote fob is a PCF7935. If you have a non remote valet or clipped head pocket key, they also have a chip.
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