My sister 03 clk320 check engine light is on. I went to a local parts store and the following codes came back.

P0400 code
P0106 code

Does my one know what these codes could mean? The car is running no driving like everything is ok

Those codes both seem to agree with what this guy found:

MAP sensor or hose to it.

https://www.youtube.com/watch?v=oxHapwV2F3g

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra