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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > 40D4 46F2 4D16 on 2011 335D - EGR SCR NOX? Tried many things, need help!



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      12-27-2020, 05:09 PM   #1
kaze0025
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40D4 46F2 4D16 on 2011 335D - EGR SCR NOX? Tried many things, need help!

I am working on a 2011 e90 335D that has been giving me a hard time with diagnosis. Car has 80k miles

I am getting codes:
40D4 Exhaust gas recirculation controller, position control
46F2 deNOx System Function
4D16 SCR System Efficiency

I have completed the Ista SCR system test numerous times. First time it said replace Nox sensors, so I did, reset adaptations and went for a drive to set everything, came back with 4D16 codes still. Did EGR test, test came back a bit slow, cleaned the EGR, code went away on the 2nd drive, still got 4d16 code. System test also said to request regen as it detected a loaded DPF. Drove for 2 regen cycles and recompleted the SCR system test, still get a loaded DPF message and to drive again. This has happened twice now. Is this pointing to a bad DPF? or something else?
Here are the screenshots from most recent SCR test.

Last edited by kaze0025; 06-08-2021 at 01:38 PM.. Reason: Adding photos
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      12-28-2020, 10:31 PM   #2
Yozh
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What motor temperature does the car run at?
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      12-29-2020, 08:03 PM   #3
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per the screenshot, it read 87.86C. On every SCR test ive done, its been around that same.
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      01-04-2021, 12:32 PM   #4
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Any suggestions?
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      01-04-2021, 11:20 PM   #5
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If your motor runs at 88 then the next thing is to clean the urea metering valve. It’s easy with warm distilled water. Also, looks like you have EGR code 40D4. I would address that as well. Could be just dirty.
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