MAP sensor is on the inner firewall on the drivers side; other side of the wall from the brake booster.

The hose goes to a fitting in the intake manifold. It is under the "rack of ribs".

If this hose falls off, the system cannot tell how much boost is being provided so the computer dumps the waste gate. This kills your boost and makes the car run like a slug.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech