40D4 46F2 4D16 on 2011 335D - EGR SCR NOX? Tried many things, need help!

kaze0025 · 12-27-2020, 06:09 PM

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.

Yozh · 12-28-2020, 11:31 PM

What motor temperature does the car run at?

kaze0025 · 12-29-2020, 09:03 PM

per the screenshot, it read 87.86C. On every SCR test ive done, its been around that same.

kaze0025 · 01-04-2021, 01:32 PM

Any suggestions?

Yozh · 01-05-2021, 12:20 AM

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.

12-27-2020, 06:09 PM	#1
kaze0025 New Member 3 Rep 19 Posts Drives: 2011 335d Join Date: Oct 2020 Location: San Diego iTrader: (0)	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 02:38 PM.. Reason: Adding photos
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12-28-2020, 11:31 PM	#2
Yozh Colonel 871 Rep 2,611 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	What motor temperature does the car run at?
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12-29-2020, 09:03 PM	#3
kaze0025 New Member 3 Rep 19 Posts Drives: 2011 335d Join Date: Oct 2020 Location: San Diego iTrader: (0)	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, 01:32 PM	#4
kaze0025 New Member 3 Rep 19 Posts Drives: 2011 335d Join Date: Oct 2020 Location: San Diego iTrader: (0)	Any suggestions?
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01-05-2021, 12:20 AM	#5
Yozh Colonel 871 Rep 2,611 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	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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