OK, my temp sensor (four prong) was indeed bad as the codes said it was. Now the only code left to eliminate is #11 (air injection system, open or short circuit).

What does this mean?
What do I have to fix to stop this code?

Thanks,

AL

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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