P0101 Maf sensor

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Seanj1972

New Member
Joined
Aug 18, 2023
Messages
5
Location
Nottingham
Car
W212 220d
Hi all I'm new to the forum but not new to mercedes. I've just bought a 2016 E class Amg line premium plus. The issue I have is with my current car which is a 2012 E220 d. It doesn't do a lot of mileage as I work from home. I do approx 1000 miles twice a year when out auditing through work. I had it serviced in July just before a staycation where I did around 400 miles in a week. The following week while running around locally the EML appeared. I booked it it at my local Mercedes indy. Initial scan showed P0101. They had it for 3 days where the swapped out the maf and other sensors to no avail. He said he would send values to mercedes. They came back and said it was a wiring issue and that the Maf sensor and Ecu where working normally . He then left me another week whilst supposedly waiting for wiring diagrams from Mercedes. At this point I'd had enough and took it into a auto electrician. He gave the wiring a clean bill of health . He also gave me a copy of the wiring diagram and explained that he though the issue with the Maf sensor. He said there was only 2v coming out of the maf but this means nothing to me. . This chap came highly recommended but admitted to me that he didn't usually work on diesels but if there was a wiring issue he would find it. It is now booked in at gee diesels in early September but I though I'd ask on here in the meantime. The EML reappears on every 2nd startup but power is always restricted. I have checked the intercooler pipes these are in good condition and look relatively new.

Apologies for the essay but I wanted to post all details.
 
Has he done a smoke test as initial test on the intake?
 
Thanks for the reply. I'm not sure. It's going in to a diesel specialist very shortly and I'd imagine that would be their 1st port of call.
 
There are diag routines to clear MAF adaption values when you replace filter and the sensor on most MBs.
Normally you can get away with changing filter and not running the routine. If the old filter was rather dirty and restricted, large adaption values may have been learnt. You then put a new filter in and with those large adaption values still applied, you can get a range error.
I note you said this happened after the service, so worth checking.
 
Just an update on my issue. Have changed both intercooler hoses. No visible splits but a lot of oily residue around the top joint on the drivers side red hose. No change Eml light returns on 3rd start of the car. And power still restricted. I have noticed however that the clip that holds the wiring harness to the top of the airbox is broken thus leaving a small hole in the top of it. I'm booked in now at another local indy in a week's time so I'll post an update then.
 

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Just an update on my issue. Have changed both intercooler hoses. No visible splits but a lot of oily residue around the top joint on the drivers side red hose. No change Eml light returns on 3rd start of the car. And power still restricted. I have noticed however that the clip that holds the wiring harness to the top of the airbox is broken thus leaving a small hole in the top of it. I'm booked in now at another local indy in a week's time so I'll post an update then.
Hey,

How did you get on with this?

I had the P0101 error and have just had my MAF changed at a garage. The engine management light is still on and no different than before. (Lacks power)

They have told me to seek help from a Auto Electrician as they do not have the machine to programme aftermarket parts so that the car knows what it is (this sounded odd so if anyone can confirm this?)

I’m £200 down and no better off. I don’t want to just keep visiting different places who will all say they can try help and get no where.

Appreciate any input if anyone can advise?

Thanks

Sam
 
Hey,

How did you get on with this?

I had the P0101 error and have just had my MAF changed at a garage. The engine management light is still on and no different than before. (Lacks power)

They have told me to seek help from a Auto Electrician as they do not have the machine to programme aftermarket parts so that the car knows what it is (this sounded odd so if anyone can confirm this?)

I’m £200 down and no better off. I don’t want to just keep visiting different places who will all say they can try help and get no where.

Appreciate any input if anyone can advise?

Thanks

Sam
Hi Sam,
Unfortunately I didn't get mine fixed. Tried main dealer ,Indy and auto electrician. They each contradicted each other with their diagnosis. Ended up cutting my losses and sold it to we buy any car.

Regards

Sean.
 
Hi Sam,
Unfortunately I didn't get mine fixed. Tried main dealer ,Indy and auto electrician. They each contradicted each other with their diagnosis. Ended up cutting my losses and sold it to we buy any car.

Regards

Sean.
Hey Sean,

Thanks for the reply.

Well that doesn’t give me much hope. I’ll be honest I was thinking of selling before this issue anyway, never much like the car while i’ve had it.

I’ll see what the Auto Electrician comes back with but if it looks like it’s going to turn in to a mystery tour then I might have to do the same!

Appreciate the help.

Sam
 

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