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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > P20EE code on 328d with only 3000 miles
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      01-07-2017, 07:53 AM   #1
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P20EE code on 328d with only 3000 miles

My nearly new 2015 F31 328d is at the dealer due to a CEL with a P20EE code. Apparently at least one of the NOx sensors has to be replaced. The car has fewer than 3000 miles on it. For what it's worth, the weather was cold (by Texas standards) at ~35F when the CEL came on.

I'm coming from a VW diesel which makes this particularly disconcerting for me.

The car is never used for short trips. I commute with it about 25 miles each way which is plenty of time to get up to operating temperature.

Any advice or shared experiences would be appreciated.
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      01-08-2017, 06:46 PM   #2
floydarogers
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There were some NOx sensor faults early in the first year of US import of the 328d. This appears to be in that same realm of happenstance.

I wouldn't stress on it; they had to institute better quality control.
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      01-08-2017, 08:37 PM   #3
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The CEL on mine went off in the test drive because of the NOx sensor, seems to be a pretty common occurrence with these cars.
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      02-01-2017, 12:40 PM   #4
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I doubt it's the cold specifically, I'm in canada and my car routinely drives in sub-zero weather without issues.
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      03-05-2017, 07:38 PM   #5
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CEL went of on my 2014 328d with 97K on the dial.
Historically car had only O2 sensor replaced at about 50K under warranty, other than that car runs great.
Took it to local indy, code 26F500: weak SCR, and secondary code for NOx sensor trowing abnormal reading.
instead of throwing parts at the issue as dealers tend to do he suggested engine management software reload, apparently there was a BMW bulletin about it.
Long story short after software reload CEL came back in less than 50 km, this time only weak SCR code came without NOx, so he induced DPF regen and I took a road trip, after couple day's CEL came on again, with NOx sensor abnormal reading.
I was ready to pull a trigger on sensor replacement, that apparently is $900+labor, so we agreed that he will reset the code and next time if it is the same sensor issue he will replace it.
Now after 3 weeks car is running great with no issue, apparently it takes time for the sensors to relearn new software that actually opened up operating limits that were to narrow in original programming, so fingers crossed the issue is gone now.
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      03-05-2017, 10:52 PM   #6
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Quote:
Originally Posted by Aero7000 View Post
CEL went of on my 2014 328d with 97K on the dial.
Historically car had only O2 sensor replaced at about 50K under warranty, other than that car runs great.
Took it to local indy, code 26F500: weak SCR, and secondary code for NOx sensor trowing abnormal reading.
instead of throwing parts at the issue as dealers tend to do he suggested engine management software reload, apparently there was a BMW bulletin about it.
...
This is a disappointing story. That's about the mileage when the M57 engines (E90 335d, E70 X5d) started throwing "weak scr" codes. FYI, the actual code is 4D16; you can search for it in the e90post diesel subforum (and bimmerfest), where there are many posts on this issue. I had been hoping that the newer system on the 328d would prove to be more robust...

It's important to understand that there are about a half dozen reasons the 4D16 CEL may be set: 1) Bad mixer (DEF injector), 2) bad mixer (exhaust flow turbulator), 3) bad NOx sensors, 4) bad DEF fluid, 5) bad SCR, 6) DEF tank faults (there may well be more but these are the popular ones.)
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      03-08-2017, 05:15 PM   #7
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I agree it is disappointing,
I guess we got spoiled by experience with other cars that have great reliability. I just got rid of 3.5SE Nissan with 180K that never had CEL or any other issue even once in almost 9 years.
Just want to ask, why you think 26F500 is not a genuine code, F30 is a newer model with N47T engine, and I hope issue can be resolved through adaptation to updated software.
On the other hand I do realize that these sensors have limited life, but I read it should be closer to 200k not 100K.
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