Your belt might be a little loose. I've been told that the engine controllers monitor belt slippage. After a certain point it shuts the engine down to prevent damage. Re-check to make sure that you have the correct tension, but don't over-tighten.

Otherwise, it might be just a coincidence. Even after you've cleared the code and cleared the memory (disconnect the battery for 30 seconds, turn the key to on power on position ,but do not engage the starter, for 10 seconds, turn it off for 10 seconds) only the same code comes up?

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio