MASS AIR FLOW SENSOR: replace just sensor vs assembly
 

2009 E320 Bluetec (the one that's not actually bluetec 😡). Having trouble finding exact location and if only the sensor needs replacing or entire assembly. Also PRICES! Found new sensor as low as $23 and complete assembly for as much as $700. Cars runs fine, just check engine light on with P0101 code on scanner. Plan to replace fuel and air filters (pita!!), clean MAF sensor and reset check engine light. If that doesn't do it I need to replace MAF... just can't find any consistent information on exactly what to do. HELP!

Hello and welcome to the forum Tom - take a look at the link below to a DIY tech article from our site on the W211 platform's MAF replacement procedure. Please let us know if you have any questions or need any assistance with part needs.

Mercedes-Benz W211 MAF Sensor Replacement (2003-2009) E320 | Pelican Parts DIY Maintenance Article