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Old 03-26-2020, 10:23 PM   #11
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Default Re: Sprinter NCV3 EGR's

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Originally Posted by Milestogo View Post
Once the unit " fails," and shifts to LHM mode I need a means to clear the codes and get the vehicle operating again in normal mode. Therefore the need for a good diagnostic tool.
As you are shopping, keep in mind the scan tool does not actually fix the problem. You will be in LHM until you fix the problem. A few exceptions, but in general no.

The other thing to realize is that a "code reset" is a federally mandated OBD command - both that it exists, and what it does in the background.

Thus - consider your lowest cost tool that can perform a reset - ie, all of them - is a good thing to consider. There is confukulation with the codes on all the aftermarket tools - but since the scan gage and other universal OBD tools have been around so long, a search for the wrong code will generally bring up the right conversation here and elsewhere.

IMO - put a scan gage or similar on your dash - then if you want more, and you really need to get something critical done or out of the computer, don't mess around with anything less than a clone factory tool - it's a waste of time. None of them do squat sitting next to the factory tools.
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Old 03-26-2020, 10:32 PM   #12
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Default Re: Sprinter NCV3 EGR's

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Originally Posted by NBB View Post
IMO - put a scan gage or similar on your dash - then if you want more, and you really need to get something critical done or out of the computer, don't mess around with anything less than a clone factory tool - it's a waste of time. None of them do squat sitting next to the factory tools.
For most owner repair purposes there are many very useful scan tools short of a factory tool or clone. Certainly some more advanced operations would make good use of a factory tool but I don't think it's at all correct to make a blanket statement that anything between a Scangauge and a factory tool is a 'waste of time.' This thread is a perfect example in that the OP does need a scan tool, but there's zero need for him to immediately jump to the expense and complexity of a full factory clone, in fact that kind of recommendation in a case like this could do more harm than good.

.

Last edited by smiller; 03-26-2020 at 10:46 PM.
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Old 03-27-2020, 12:05 AM   #13
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Default Re: Sprinter NCV3 EGR's

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This thread is a perfect example in that the OP does need a scan tool
I actually don't think he needs a scan tool. Most don't.

There are plenty of discussions here on the subject.

IMO, and I think most would agree, most aftermarket tools basically give you very little more than a data stream to the powertrain module. That's it. Forget the dozen or so other modules. A mid grade tool priced even with a factory clone will get you a data stream into a few more modules, maybe a few tests and calibrations. If you're a pro who looks at that data every day, you'll spot an outlier quickly. However, let's get real, if you're a pro who does this every day, you see a code and you're done - you know what to do 95% of the time. A non-pro is going to go cross-eyed looking at those data streams. Extreme outlier data will be seen in the codes anyway. If you're non-pro - you're going to need the additional coverage, guidance, special tests, etc, that the factory tools and the supporting factory workshop data and procedures offer to get a clue into what is going on.

That said, many have bought the factory clones here for exactly these reasons. If not, you have a new mid-grade tool at home - tell us a diagnostic story about how that thing actually solved a real problem. For my Sprinter, 11 years - 100% of my problems have been solved by following generic OBD trouble codes from my scan gage.
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Old 03-27-2020, 01:14 AM   #14
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Default Re: Sprinter NCV3 EGR's

Virtually all of the units typically discussed on the forum provide much more functionality than just the powertrain module. The common Autel units (just as an example) will access most modules and I have found these products useful, such as allowing me to check inputs to the ESP system for rationality after a fault, checking EKAS and EGR functionality, HVAC parameters during troubleshooting, transmission parameters during troubleshooting, DPF stats, clearing codes, and many more uses that I'm not going to bother to recount. Is a factory scan tool preferred for advanced troubleshooting? Of course. Is this what a professional would use? Of course. Is it required to the point that anything less is a waste of time? Of course not. I don't want to get in a pissing match over this, just noting that the idea that only a factory tool can be of any practical use is perhaps a bit extreme.

.

Last edited by smiller; 03-27-2020 at 01:55 AM.
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Old 03-29-2020, 08:20 PM   #15
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Default Re: Sprinter NCV3 EGR's

Thanks Smiller and NBB.

To refocus. This issue was brought about by a failure of a relatively new unit at 3744 miles. The tech write up from a Mercedes/Sprinter Dealer states that EGR valve mechanically locked and to have an internal failure. There are other descriptions of Rail Sensor readings etc that I don't understand. Unit replaced with new.

My concern is to be stuck in the boonies and have another complete failure of the unit thereby potentially stranding me. My intention was to be able to swap the unit and clear the codes for continued operation. I wasn't really looking at any other mechanical issues to deal with. LHM mode is a substantial reduction in performance for the vehicle.

It appears I may have a rather simplistic understanding of the system.
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Old 03-29-2020, 09:32 PM   #16
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Default Re: Sprinter NCV3 EGR's

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Originally Posted by Milestogo View Post
My concern is to be stuck in the boonies and have another complete failure of the unit thereby potentially stranding me. My intention was to be able to swap the unit and clear the codes for continued operation. I wasn't really looking at any other mechanical issues to deal with. LHM mode is a substantial reduction in performance for the vehicle.
If that is your primary concern and you want to carry a spare EGR valve with you (not certain that is really necessary but I understand once burned twice shy) then my suggestion would be to get familiar with the EGR valve R/R process in advance (it's not difficult, but roadside repairs are not the place to be learning things) and have a code scanner with you to check for fault codes and reset as necessary. If you do that you will probably never have a problem again (you never seem to have problems that you are prepared for ;). Also if you are ever bit again do try the ignition cycle procedure (described above) a few times and then reset the code causing LHM, sometimes this will get you back on the road. In my case it allowed me to finish a trip and get home before I had to pull the valve for manual cleaning.
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Old 03-29-2020, 09:51 PM   #17
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Default Re: Sprinter NCV3 EGR's

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Dealer states that EGR valve mechanically locked and to have an internal failure.
ie - it was clogged with soot and needed cleaning. The port is spring loaded, so it's not really possible for a "locked" valve to do any damage to the motor. You could have asked for it back and used it as your spare.
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Old 03-29-2020, 10:32 PM   #18
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Default Re: Sprinter NCV3 EGR's

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ie - it was clogged with soot and needed cleaning. The port is spring loaded, so it's not really possible for a "locked" valve to do any damage to the motor. You could have asked for it back and used it as your spare.
That's a good thought. If it's too late to recover yours maybe they have another low-miles 'bad' take-out EGR valve. After a cleaning it would probably be fine as a spare, and save a lot of money.
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Old 03-29-2020, 10:57 PM   #19
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Default Re: Sprinter NCV3 EGR's

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They swapped the EGR valve, now he does not have a problem. That means we're done - but instead you're back for another time share style sales pitch for your commercial business on a community forum. ie, you're all hand-waving and irrelevant BS - very little actual content. I feel sorry for your customers.
This post and the post from Dennis that it responds to......not up to the standards either of you generally maintain. Confuses and distorts the valuable support both of you provide to subscribers. Chill a bit and let's move on.
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Old 03-30-2020, 02:37 AM   #20
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Default Re: Sprinter NCV3 EGR's

Quote:
Originally Posted by NBB View Post
ie - it was clogged with soot and needed cleaning. The port is spring loaded, so it's not really possible for a "locked" valve to do any damage to the motor. You could have asked for it back and used it as your spare.
Cleaning the EGR is good, but soot is not the only cause of EGR failure. A bad EGR anti friction damper can cause a limp mode due to the EGR not returning 100% back to its home position (completely closed).

If you were to delete the function (no more limp mode) of the EGR in a case like I'm describing, the van will start making a howling noise that will get louder with higher RPM due to the fact that the EGR is not completely closed. To get rid of the howling noise you will have to use a EGR plug... So... soot is not the only cause of EGR failure at low miles as you imply.
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