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View Full Version : P0101 error code - is that just for MAF?


kmessinger
08-26-2010, 09:44 PM
I have a P0101 error code (and a check engine light) which I think is the MAF sensor. I took out the air filter, blew it out, ordered a clean one, put the old back in. Checked all the MAF wires with nothing found. Error still on.

Is this code just for the MAF? Fix it by replacing the MAF Air Flow Sensor ($300) or could it be the MAP sensor or Air Intake Pressure Sensor, or Air Intake Temperature Sensor (it was real hot yesterday)?

Code came on when I went to start this morning. Seems to run fine, out on the freeway up to 60mph with no problems. Yesterday did note turning from exit lane onto surface street I had basically no throttle response for 5-10 seconds.

Thanks,

Keith

WAYNERODD
08-27-2010, 12:17 AM
Keith, Not all error codes clear right away. I am not sure about your code. But it does refer to the performace of the MAF sensor. A good scan tool like DAD or a DRB3 would help you find out what the actual reading of the MAF sensor to see if it is out of range. Some after market scanners also can do this, but not all of them.

But if you must buy a new you can get them here at a great price.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280550804847&viewitem=&sspagename=STRK%3AMEWAX%3AIT

This one is for a 2004-2006. You did not say what year your van was. So I can not say that this will fit your van.

Also I had one go bad in van van. Left me stranded, would not start, all I had to do was unplug it. That was enough to let me get back home in limp home mode. Just thought it I should mention it, should yours go out and stop you dead in your tracks.

Hope this helps, Wayne

jdcaples
08-27-2010, 12:36 AM
Keith has an NCV3.

I think you can also clean it.

http://sprinter-source.com/forum/showpost.php?p=55809&postcount=5

I also think really you should consider having it scanned, like WAYNERODD said, but with WiTECH, MB SDS, StarSCAN or StarMOBILE.

There are 1/2 a dozen MAF codes in the DTCs our NCV3s can toss.... most of which are voltage related.

Most - if not all - NCV3 DTCs (and no, P0101 is not one of them).

http://sprinter-source.com/forum/showpost.php?p=61984&postcount=1



-Jon

WAYNERODD
08-27-2010, 01:13 AM
Keith has an NCV3.
http://sprinter-source.com/forum/showpost.php?p=61984&postcount=1

Thanks Jon for fixing my screwup!

scubanw3
08-27-2010, 05:36 AM
EGR and low airflow issues can cause extraneous MAF codes along with other misleading codes. The EGR hanging open creates a sudden lack of airflow and velocity tricking the MAF into thinking there is a problem. Since the NCV3 has so many EGR issues, there may be a connection in your case. The lack of throttle response also supports this. See my post under 3.0 CRD turbo/sudden loss of power??
Hope this helps.

Thank you, John
Sprinter Store
http://sprinterstore.com/
A division of Upscale Automotive, Inc.
19460 SW 89th Ave.
Tualatin, OR 97062
503-692-0846

kmessinger
08-27-2010, 10:32 PM
Well, it is in the shop. Yes, the P0101 error means lots of other problem areas as well so they are still looking. ($)

They think an air leak between the turbo and intake manifold?

I now have a loner (yes, I am a loner also)! and am on my way home.

Regards,

Keith

Mrdi
08-28-2010, 03:00 AM
My thoughts are with you Keith.
To whom did you entrust your steed?

Use the good olives.

Mrdi

kmessinger
08-31-2010, 08:25 PM
My thoughts are with you Keith.
To whom did you entrust your steed?

Use the good olives.

Mrdi

Beshoff Motorcars Mercedes in San Jose . . . I don't even use olives any more. They displace too much alchohol.

They found it was the seal on the attenuator baffle (is that the turbo resonator?). It is where the air flow comes from the turbo across to the drivers side and down . . . I haven't had the chance to look for it. Parts are cheap, like $15, but labor for 2 days of looking will be around $600. I should pick it up this afternoon and have all the codes, etc.

Regards,

Keith

Mrdi
08-31-2010, 09:02 PM
Ironic..
Considering some of the alternatives ($$$) that sounds like good news.

jdcaples
09-01-2010, 01:32 AM
I should pick it up this afternoon and have all the codes, etc.

Regards,

Keith

I'm looking forward to the codes.

Please consider posting in NCV3 write-ups about what device reported "P0101" and then the real codes, problem description and remedial actions.

-Jon

kmessinger
09-02-2010, 10:32 PM
Picked up the bus this morning (it was ready yesterday afternoon) - YAHOO! :bounce:
The culprit was an o-ring. It is just below what used to be the turbo resonator and is now the attenuator baffle(?), in the aluminum pipe. It was torn. The only way I can see this happening is in engine assembly. It doesn't look like normal wear and tear to me.

From the invoice . . . "Performed quick test. Code 2623-001. Performed diag according to SDS. Found specified and acutual values not in spec. SDS having communication problems with vehicle. Rechecked with different SDS, using 08/10 software and all available patches. Found specified values now correct but MAF sensor reading high. Performed charge air system leak check. Found leak at lower seal of Attenuator (baffle)."
25980

25981

The good thing is it did not throw me into limp mode and Beshoff Motorcars Mercedes, gave me a C3100 with 2500 miles on it, as a loaner the whole time the Sprinter was in the shop. I noticed quite a bit more "pick-up" than I am used to but I was so low to the road I couldn't see anything. Really, if you step on the gas with this car, you better be paying attention!

Total bill: Parts $4.50; Labor $560 :thumbdown:

My extended warranty (Good Sam) declined to cover this but I am going back to them with the pictures for a second try.

My first problem in 45k miles.

Regards,

Keith

jdcaples
09-02-2010, 11:20 PM
According to the DTCs I found in this posting:

http://sprinter-source.com/forum/showpost.php?p=61984&postcount=1
2623 is "Charge air system offset drift at idle"

So what I - a consumer - learned from your posting:

Outdated scan tool software (Mercedes-Benz Star Diagnosis System - SDS), is something to verify as up front and immediately. ("Is your SDS up to date? I'd like you to verify this before you start work.")

I also learned that if Mass Air Flow metrics are out of spec, it's not necessarily just the sensor, further digging is required.

I don't think I'm speaking out of turn if I were to say that tech training is critical and Dodge techs didn't necessarily get the same level of training MB techs are getting with/about the NAFTA Sprinter.

If I - completely w/o training and only a small understanding of anything "Sprinter" - were faced with this problem, I'd be swapping parts ($) for hours (more $) and hours (more $) before I figured out the real problem; and my manager would be charging you for my guess work.


This is an excellent example of why a hobbiest or an underqualified tech shouldn't be allowed to wrench on your Sprinter.

-Jon

Aqua Puttana
09-03-2010, 01:06 AM
...
This is an excellent example of why a hobbiest or an underqualified tech shouldn't be allowed to wrench on your Sprinter.

-Jon

Hey Jon!
EASY there good buddy!:laughing: If I take your comment at face value I'd never be able to work on my own van.:hmmm:

Your point is well taken though.:hugs: vic

jdcaples
09-03-2010, 01:47 AM
Hey Jon!
EASY there good buddy!:laughing: If I take your comment at face value I'd never be able to work on my own van.:hmmm:

Your point is well taken though.:hugs: vic

Actually, you're right. I should have said you shouldn't pay money with an expectation of expertise and first-try-success remediation to a non-qualified business or technician.

-Jon

pnw sprinter
01-28-2013, 02:36 AM
Hello All.
I've had this error code spring up on me several times. :yell:I've cleaned my MAF sensor as directed and no luck. I've also checked the hoses etc and seem to have no problems there.

Might P0101 come up on ScanGauge II if the EGR valve is clogged? :thinking:I haven't tried to clean that yet but it might just be my next step. Any help/ advice here would be appreciated.

Thanks

Aqua Puttana
01-28-2013, 11:29 AM
Hello All.
...I've cleaned my MAF sensor as directed and no luck. ...Thanks
Go back and reread this entire thread. Depending on the scan tool that gave you the code the DTC information and cryptic label your information could be vague at best.

The air mass is a calculated value which is monitored for expected range as to present engine operating conditions by using many of your sensors. The MAF sensor is but one piece of that. Off the top of my little pointy head problems with the boost pressure sensor, boost air temperature sensor, O2 sensor, EGR, and a few I know I'm leaving out can also contribute to a Air Mass related DTC. Sorry I can't offer more. vic

fista@hotmail.com
06-13-2015, 06:58 PM
I have 2010 dtc P0101 I have looked at every thing and still can not get rid of the problem, I have to be over looking something BUT WHAT!

lindenengineering
06-13-2015, 09:26 PM
I have 2010 dtc P0101 I have looked at every thing and still can not get rid of the problem, I have to be over looking something BUT WHAT!

This can be a bit of a challenge at times to trace, especially if you don't have specialist auto mechanics equipment.
Basically the PCM is telling you the charge values are out of whack.
It starts aft of the turbo where charge out leaves the turbo on its long and arduous route to the other side of the engine and then back up again to the inlet manifolds.

The dog leg alum tube and its seals, plus that ill conceived silencer and all the adapter sleeves & seals are very prone to leaks. (leaves me at times to think what brainiac came up with that idea.):thumbdown:

Now down to the rest bend hoses that connect to the cooler (yes "rest bend" like the porcelain commode in your house) Prone to rupture and worn split O rings, these things are a very high on the list of leakage points. In college in France the teaching was putting an omega bend in a high flowing pipe was a no no mon sewer! Basically P trap! :idunno:
Of course I won't mention the intercooler yet (being a bit sarcastic) because it has a nasty habit of leaking at the end tank seals.
Then its up and under to the throttle body passing an O ring plus gasket where there is a charge pressure sensor and then onto a mix of O ring and gasket where the whole snaking arrangement meets the manifolds proper. Phew! whatta trip!

Now normally a regular low pressure smoke machine can find leak points but with these machines the recommendation is to pressurize the whole inlet arrangement with 30 psi of shop line pressure.
By the way I see that the pro tool suppliers like Snap On are releasing high pressure smoke machines that deliver 30 psi for us in the trade at grandiose prices.

Now in practical terms I had one last week that would only fault out occasionally and it seemed that it always happened on steep grade once in a blue moon. So it was obviously a high pressure leak.
It was ultimately traced to a leak in the intercooler end tank seal using 30 psi of shop line pressure. A new cooler and hoses fixed it!

By the way P0101 equates to MB code DTC 150200 and includes 14CF00 referring to EGR component Y27/17.
And that my dear friends includes a sticking EGR valve and blocked up EGR cooler.

Now that last week's specimen had the same info pop up on my scanner screen but I preferred to concentrate on the charge air system which eradicated all the faults. Lady artist owner reported a subsequent trip to Chicago from Denver showed no faults by the time she was in Davenport Iowa.
All happy campers.
Hope that gives you some pointers!
Dennis

flman
07-12-2015, 10:01 PM
I just got a P0101 today and my van is a total slug, should I throw $300 at it for a new MAF or send it to the dealer?

Any one have the pin out test for the Sprinter MAF?

I checked all boost piping and the EGR and it all looks good.

flman
07-19-2015, 03:44 PM
Mine turned out to be a dirty air filter, and I picked up and STP one on a Sunday, and the problem remained. So it went to the dealer, they re-adapted the offset drift on the MAF, and it still was in limp until they put in a OEM Filter. So if you have this code try a Mercedes Benz air filter first.

Busterfla
07-24-2017, 02:04 AM
My 2007 just threw the p0101 and then a short while later the p0242f. I bought a new MAF sensor and removed the DPF and cleaned it and reinstalled. I drove the van from TN to FL reaching speeds of 80 at times and it still runs well but when I erase the codes they always come back when I shut it off and restart. They never come on while driving? Any clues? I have a cheap OBD scanner so it could be any of the aforementioned problems. Clues as to where to start looking would be greatly appreciated. 2007 CDR 2500 with only 45k miles. It is a camper conversion so long trips are the norm but it does sit for periods without starting. Not many short trips.

allisow
12-18-2018, 12:53 PM
Hi guys,

I get the exact same fault. (OM651 - 515 CDI Mercedes -Benz Sprinter)

Initially the fault appeared ( (Delphi Unit) - P0101 - Mass Air Flow Sensor - Algorithm Based Failures - Permanent).

I took the vehicle in to our Mercedes dealership as I couldn't determine the reason for the fault but noticed that the actuator for the (not sure if this is low/high pressure (bigger actuator) ) turbo had not armed after starting, indicating a vacuum fault. They discovered a faulty transducer (the one on the right of the engine below the throttle body (us being from South Africa - RH drive). Replaced transducer and all went well for about 2 weeks, thereafter the same fault appeared.

I then thought the same issue because the fault was the same fault (and transducer supplied was second hand), bought a new transducer this time but fault would not disappear.
Took it back to the dealership and they inspected, fixed an oil leak from the tappet cover and advised that the fault was due to a badly worn timing chain, which I thought was odd because that wouldn't cause the fault to appear on a scanner immediately when turning on the ignition after clearing all DTC's.

Nevertheless, we took the motor out ourselves, new timing kit in, set the cams on their marks and the crank at OT. Put the motor back in, bled the fuel line and started the bus first time, no issues starting. Scanned the vehicle again and still the fault remains.

I have plugged in a spare EGR out of line to see if the EGR was causing this but no luck.
It is definitely not related to the MAF, as unplugging the MAF should result in only a short circuit to ground (thereby eliminating the P0101 caused by this sensor), the short circuit to ground does occur but then the MAF P0101 does not erase even though the sensor is unplugged. I have checked all fuses which are intact and I have bell'd out all the wires on the loom from the ECU to the transducer plug and to the MAF sensor plug and there is no break in contact, they all ring out showing a closed circuit. I have done a voltage comparison on the top transducer which feeds vacuum to the smaller turbo actuator and found that the voltage when activated is a low 0.16v but when checking the same terminal on the other transducer I get 3.3v.

Please if anyone has some input here, I see no vacuum leaks that would cause this fault and am sure it is not related to a vacuum problem but rather an electronic sensor or fault that may be inline with the transducer, as the fault will appear immediately after erasing DTC's BEFORE the vehicle has started.

:cry:

Many thanks,

Cheers.

Sprinter_SA

MVPlumbing
12-18-2018, 01:40 PM
Hi, I have a 2011 Sprinter 2500 3.0T,my Ecu kicked a p0101 Mass or Volume sensor “A” Circuit Range/Performance code.
Installed new MAF sensor twice because after the first one my diesel mechanic said that the sensor wasn’t reading air flow so I replaced it again with the same results,I cleaned out my EGR and it works properly,my mechanic said he didn’t see any air loss on his computer so I guess that rules out a leak right?
Either way the p0101 won’t go away and I’m driving around in Limp Mode which is a pain,any input would me greatly appreciated thank you

HotWired
03-16-2019, 10:33 AM
Hi MVPlumbing
Interested to here how you got on with this as I'm having similar issue.
Hope its resolved
Colin

The Grand Tour
03-17-2019, 07:45 AM
Hi MVPlumbing
Interested to here how you got on with this as I'm having similar issue.
Hope its resolved
Colin

This thread is from nearly 10 years ago... :rolleyes: