Air Mass Dilemma

[nicebubby8]

Greetings, everyone.

I am receiving many trouble codes on my 2010 E350.


The initial focus is on the Air Intake Temperature sensor, which I intend to replace due to the original appearing contaminated, and the cost is sufficiently low.

I was informed that the codes are associated with a defective MAF sensor.

Enclosed are the codes and the real-time readings from my Maf sensors.

Disconnecting sensor B results in a value of 0g. Upon disconnecting Sensor A, the readout displays 166g, while Sensor B subsequently increases to 8g.

I am willing to invest in a replacement MAF, but I seek guidance before proceeding with the expenditure.

[nicebubby8]

Well I've just replaced the temp sensor and I'm not surprised but it didn't fix the issue.

Upon disconnecting Sensor A, I observed that its temperature remains at 79°C while Sensor B's temperature decreases to 21°C.
Upon disconnecting Sensor B, both temperatures stabilise at 79°C.


The subsequent course of action appears to be attempting a costly MAF replacement, unless someone possesses other insights.

[MidnightMarauder]

How is it functioning?Whenever I experienced MAF failure, the vehicles operated quite poorly.

[DenishP4]

It is uncertain if this information will be beneficial, but when my MAF sensor was offline due to a missing fuse, a prominent characteristic was difficult upshifts. If your vehicle is an automatic and you are encountering the same issue, it likely indicates a malfunctioning MAF sensor. - presuming that MB configures the transmission ECU to default to elevated line pressures in the absence of MAF sensor data, as observed in my 4L 80E.

[rab60bit88]

Does a new MAF sensor require coding, or is it plug-and-play?

[rab60bit88]

https://www.ebay.co.uk/sch/i.html?_nkw=maf sensor&campid=5338181132&customid=2518X1570512Xf9175ef9d38da883b58403db99c3c9e4&mkcid=1&mkrid=710-53481-19255-0&subId2=15&toolid=10001

[nicebubby8]

I apologise, everyone. I did not receive notifications regarding your responses.

I ultimately resolved it. The MAF was indeed defective. I purchased a pre-owned Y-Pipe in superior condition than mine, which included one MAF. I transferred my functional MAF to it, and it accurately registered the temperature and airflow readings.


Nevertheless, I occasionally have a minor hitch after startup. Avantgarde indicated at Clevedon that the adjustments must be recalibrated for optimal performance. The issue is that I currently reside in Scotland, necessitating the search for a reputable independent establishment in Edinburgh. All local garages I have contacted have provided a standard quotation of approximately £90 for one hour of service. I would be more advantageous to purchase a superior fault reader for the two minutes required to reset it.

[rab60bit88]

You may reset it by disconnecting the negative battery terminal for 10 minutes.

[nicebubby8]

Disconnected the negative connection for 20 minutes while I replaced the fuel filter today. Currently, it is idling more effectively.

[Black_raven]

It is advisable to inspect all o-rings and seals on the turbo outlet (aluminium pipe) leading to the resonator (plastic box at the front of the engine) and the intercooler. I believe your 2010 model possesses the same or a very similar engine as my 2009 E280. I recently completed all my maintenance, and the performance has significantly improved; it drives much better than before. I previously underestimated its condition, but I now recognise how slow the throttle response and downshifts were.

Several of these seals may have been compromised during the installation of the new intake, which is how I realised mine need replacement, as I subsequently experienced a check engine light owing to multiple leaks, including a boost leak at the intercooler pipe.


I wanted to bring this to your attention, although you may already be aware.

Here is a highly beneficial link that I utilised.

[nicebubby8]

Indeed, I completed all necessary tasks when I replaced the thermostat, so I believe I am adequately prepared in that regard. I observed typical oil spots around the seal positions, which had been improperly installed. It appears that the new MAF required calibration in my situation.