E-Class (W212) 2010 - 2016: E 350, E 550

Where is MAP sensor on 2012 E550 M278

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Old 12-06-2021, 03:20 PM
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'12 E550, '10 ML350, '06 E350, '20 GLC300, '21 GLC300
Where is MAP sensor on 2012 E550 M278

I can't seem to locate where the Map sensor is located. My VIN in WDDHF9BB4CA491570.

Where is this located along firewall? Driver's side? Passenger side? High? Low? Any disassembly required for access?
Old 12-06-2021, 04:56 PM
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2012 E550 sedan 2019 E63 Wagon
Originally Posted by no_mulligan
I can't seem to locate where the Map sensor is located. My VIN in WDDHF9BB4CA491570.

Where is this located along firewall? Driver's side? Passenger side? High? Low? Any disassembly required for access?
Isn't it on the backside of the V8 air box.

Last edited by S. Madman; 12-06-2021 at 05:48 PM.
Old 12-06-2021, 05:42 PM
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'71 Pinto

Pressure sensor downstream of throttle valve.


Old 12-07-2021, 06:39 AM
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2013 E550
Originally Posted by no_mulligan
I can't seem to locate where the Map sensor is located. My VIN in WDDHF9BB4CA491570.

Where is this located along firewall? Driver's side? Passenger side? High? Low? Any disassembly required for access?
Curious- what symptoms was your car showing?
Old 12-07-2021, 07:02 AM
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'12 E550, '10 ML350, '06 E350, '20 GLC300, '21 GLC300
A bit of roughness at startup/idle. Random misfire mostly in cyl 1and some in cyl 3. CEL P300. No signs of oil in cam shaft position sensor or cam magnets electrical connections. I changed those out months ago plus added pigtails to the cam magnets.
Old 12-07-2021, 07:03 AM
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'12 E550, '10 ML350, '06 E350, '20 GLC300, '21 GLC300
Thank you Konigstiger.

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