Works all of the time! reporting info to computer of the "air flow position". This helps the computer to richen the mixture durning acceleration & leaning the mixture for emissions all of the rest of the time.

Will cause IDLE & acceleration problems!
Replacement WON'T help the engine to produce more HP at all.

MB part number is 000-074-23-14.
Bosch number is 0 438 121 044.
I would replace the rubber pleminum boot that mounts to it as well, MB number 103-141-00-90

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MERCEDES Benz Master Guild Technician (6 TIMES)
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