DEF/SCR Codes 200 Miles to No Start + Troubleshooting Log
 

This is an expected journey after the X5 was off the road for 16 months+. This thread is going to be a documentation of what clearing this is going to take. I have some reading to do and some testing to do. Probably some DEF cleaning to do as well though I checked the metering valve while installing everything. Could be the system is not happy with the old, possibly stale, DEF fluid. Draining it sounds like fun... :rolleyes:

So, having completed my trans replacement and putting about 150 miles on it, I am pleased to say that it is driving beautifully. Shifts are smooth and clean. Going to do one drain/fill with fresh fluid as I want to clean the 88k mile trans out after it sat without plugs in the cooler line holes... but that's all for my trans thread.

For this thread... ~75 miles into testing I got an SCR code for inefficiency (4D16). I figured it was because it was going to take some driving for regens to occur and go back to operating normally. So I cleared it. Probably a mistake doing that. After looking at Tis a little more carefully, I should have run an SCR relearn/activation procedure after completing the work...

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Here are the codes I am getting which include the dreaded 200 miles to no start condition. I am documenting this as a roadmap for others who end up with similar issues as it seems that good info is scattered across many threads and pages in those threads as well as across many different forums. That makes it a bit hard to follow jumping between 10 tabs in the browser. If anyone has any input by all means add it. I'll keep editing this first post until the issue is resolved and finish it off with a "SOLVED" in the title after complete.

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For Google search purposes:

41F9 SCR system: System error and poor urea/water mixture quality detected
46F2 DDE: DeNOx system, function
4748 SCR system, warning and deactivation scenario: Warning stage 2
474C SCR system, warning and deactivation scenario: Warning level 1
4D16 4D16 SCR system, efficiency

Okay, truck is driving amazing. Better than it ever has. Better throttle response, easier power delivery, etc. I'm guessing the vacuum line service helped along with the refreshed valve body in the trans. Actually I'm sure all the maintenance that was performed is contributing to the truck's overall feeling of healthiness. Which makes dealing with this SCR issue all the more frustrating.

Done a bunch more googling and turns out information is indeed scattered all over the place on this issue, but a couple threads are basically gold when it comes to how to clear the 200 mile to no start code. Located here on bfest and here also on bfest. Sorry to the powers that be if linking to another forum is not kosher, but the info is important and took me quite a bit of time to find it. Just didn't use the exact right key words to pull it up amongst all the other chaff out there. Most threads involve the dealer shot gunning parts at the truck while running through the test plan. This post was particularly important.

What I have gathered/done so far:

• I screwed up by initially clearing the SCR inefficiency code 4D16 which triggered the countdown to no start condition about 50 later.
• I then further screwed up by filling the DEF fluid in the tanks.
• I then ran adaptation/initialization of the NOX sensors/SCR system via the Foxwell which was now pointless as the complete test plan must now be run in ISTA after receiving the 200 mile error code.
• Drove 40 miles 2x at 70+mph monitoring NOX sensor readings before finding the above post hoping the adaptation would clear the no start. It, of course, did not, as the car will not perform a regen with these codes.
• Checked my metering valve, clean as a whistle. From reading this is almost never a solution
• Spent 4 hours unsuccessfully trying to install ISTA-D/Rheingold on a Win10 laptop. I'll give it another shot now that I think I have figured out where I went wrong after some more reading.

That's where I'm at now. Here's a pic of the metering valve/injector for S's and G's. My next CoA is going to be getting ISTA up and running. Go through the test plan and anticipating it will fail one, or both, of the NOX. If it fails either one, I am replacing both. Not sure if I want to drain/fill the DEF fluid itself though I suppose it could have gone bad sitting in the truck for 16 months+ even though it was being moved around from time to time. Yep, being lazy, I'm aware.

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