code po121 tps sensor on 2005 Mercedes-Benz ML350

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i get po121 crk circut on obd scanner it goes into limp mode. po161 po141 still there i cant seem to find out what is wrong dealer took my money but didnt fix the problem there is no power at the 40 amp fuse for the air injection pumpcan that cause any of this?? any ideas please help me thank you Jim
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