Diagnose LHM on 2006 2500 Sprinter, Xentry scanner or Autel MD802?



Let’s start with issues:

I’ve been trying to find the reasons for Limp Mode on my 2006, 2500 Sprinter. I changed the Intercooler hose which was worn and leaking oil around the edges. It improved, but only temporarily. I have more power, but LHM still kicks in when going up steeper hills.

I’ve been doing quite a bit of reading about LHM on this forum and have been wondering if getting a scanner will help me solve the problem. I’ve seen here that there are quite a few possible causes and many good write-ups about how to diagnose them, but if a scanner will save me time, I will invest in one. I’m not an experienced mechanic, but I want to learn how to make my own repairs.

1. Will a scanner like iCarsoft DB II pinpoint the problem for me? What can it actually tell me to help find the problem?
2. Even though I replaced the hose, do I need to also “clear” a code before boost will be restored?
3. Can LHM be caused by a slow leak in a radiator?
4. I recently changed my front brakes, but not the back ones and have a brake warning light on the dash. Can this cause LHM?

5. From what I’ve read here, it seems like a scanner would be a wise long-term investment, but I don’t want to spend the money now if it won’t help me with LHM.


  1. Any advice would be greatly appreciated!


Answer to the above 5 questions:

Answer to the 1st question:

That entirely depends upon what’s really causing the problems. For a simple hose leak, it only reports that the boost pressure isn’t what was expected. If the actuator is hanging up, you might get a “excessive boost pressure”.


Answer to the 2nd question:

if it was only a leaky hose, the check-engine light should be off the next time you start the engine. The “low boost” code will be stored, but it won’t affect current operations.


Answer to the 3rd question:

“LHM” is too vague a term… there are dozens of symptoms (such as leaky hoses) that people call LHM, but they’re not.
As for a “leaky radiator” (you do mean coolant leak, and not as a cracked head gasket?): no, it shouldn’t cause any LHM-like symptoms. A cracked intercooler is another story. That’s the part of the radiator sandwich that the turbo air is going through… they can crack (causing loss of boost), but that would not involve the coolant at all (unless both leaks were caused by the same mechanical damage: like someone shooting an arrow or bullet through your radiator).


Answer to the 4th question:

Which brake warning light? (there are two or three).
Without looking it up to be sure, i don’t think any brake-associated light should cause LHM-like symptoms (although triggering anti-skid actions due to wheel sensor faults might feel like it at times).


Answer to the 5th question:

Well, you seem to also have a brake issue… which a good Mercedes scanner would help with.


Answer to the 6th question:

A good Mercedes scanner can provide peace of mind, and warnings of impending issues before they bite you on the road.


Good BMW diagnostic scanners highly recommended:

Option 1 (Review): I love my Autel MD802 all system version and works well on my T1N. It will read live data and display it, tell you error codes and clear codes if required. As said above the codes will tell you what the ECU is seeing as a problem which helps you diagnose the fault.


It you were buying a T1N today, you’d probably go for the Autel M802 Pro.

The price of the MD802 is closer to the iCarsoft unit price than when I purchased the iCarsoft tool. The MD802 will work with many more manufacturers.




Option 2 (Review):

The MB star C3 Xentry scanner and MB SDCONNECT C4 Xentry scanner systems that are available from the “clone” market would be 2nd choice, if only due to the hassle of requiring a legacy PC to operate (as the DAD requires, too).


The C3 is the multiplexer. The Xentry software is an “option”. They will send you just a hard drive as an addition to the C3, or you can choose the laptop option with an active serial port and the correct formatted hard drive installed. You can access the individual brake bleeders through the ESP module if I remember.


A or B?

If the Autel MD802 scanner can fully flush the brake lines then that would be the best choice. On the other hand, if the Autel scanner can’t flush the brakes then the clone MB STAR Xentry scanner is better. There’s really no PC hassle, as a laptop with installed software comes with the C3 scanner.


In a word. the Autel M802 is slightly less capable, the “C3” systems are equally or more capable.



  • Car OBD2 Scanner Car OBD2 Scanner

    Car OBD2 Scanner OBD2 auto scanner become a famous car diagnostic tool,Car tool,diagnostic scanner,and Vehicle diagnostic tool OBDII product has a varies of auto […]

  • How to solve Autel DS708 language problems

    How to solve Autel DS708 language problems   Problem: One of Autel DS708 users came across “The language is not authorized” error during the upgrade procedure.   Solution: The reason is that each Autel DS708 multi-language diagnostic system can only support one language in one device. If you select a different language, you will get the error message. Do not add more than one language when update the device. Related posts: Autel MaxiDas DS708 Language Setup […]

  • Autel Maxidas DS708 about Saab 93 FAQ

    Autel Maxidas DS708 about Saab 93 FAQ Replace Maxidas DS708 (Autel Maxisys MS906) a key-pal from American said:”I have a 2003 […]

  • Autel Creating a Report on the DS708

    Creating a report on a DS708 is simple when you know how. Please follow the steps below.     Choose the Manufacturer and the Vehicle you are plugged in too with our diagnostic tool. Carry out an AutoScan function on the vehicle with your diagnostic tool. Once completed look at blue coloured section on right hand side of diagnostic tool screen and see the ‘Report’ button. Click on the ‘Report’ button and you will be able to see the report generated on the screen for you to view. Now you will have 2 options; ‘Print’ or ‘Save’. As long as you have Wi-Fi connectivity and WiFi printing set-up a PC, you can print directly to your PC. Both your PC and Diagnostic Tool must be on the same computer network. If no Wi-Fi available you can save to the diagnostic tools SD card for later at a later date To view on your diagnostic tool later, go to ‘Data Manager’ and then ‘Playback’. And if you want to print this document then there is a print option in Playback. The Report feature will only display a short overview of modules within the vehicle,  and record what and how many faults exist. You may also need to go into each module and do screen shots of codes if required.   Who Viewed This Article Also Views: AUTEL Automotive Diagnostic Tools Introduction How to connect Autel MaxiDAS DS708 to OBD II/non-OBD II vehicle Autel Maxidas DS708 activate BMW E65 Dynamic Drive Autel Maxidas DS708 scanner reset Audi A4 EPC light […]