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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 > HELP! DEF System Continues to Fail



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      03-29-2022, 12:36 AM   #1
826350350mw
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Unhappy HELP! DEF System Continues to Fail

Hi everyone,

I am in search of some advice for my bmw 335d 2011. Since buying the car we have had lots of issues. We have replaced the EGR valve, done the walnut blasting for the CBU. Now, we got the 200mi countdown of death. We took it to BMW dealer and they said the Nox sensors could be bad as well as the def tank temperature and level sensors and need to replace the whole tank. We went ahead and ordered the replacement kit from Xemodex to replace the interworkings of the tank beneath the pump. After doing so, the countdown was still there. Took it in and got it recoded and flashed the computer then did a drive test perfectly, still showing the countdown. Was informed again to replace the tank, but decided to do some research on this forum and are going to try and do a DIY to fix the NoX sensors, as well as drain the tank, clean with water and refill, and check and clean the injector nozzle. When using the OBD reader the codes that were thrown were P207F, P20EE, 41F9, 474C, 4748, and 4D16. If you can give any information on how to try and have a cheaper a fix, and not spend $5,000, it would be extremely helpful. Anything to try and not just give up and sell the car. Also, I reside in California, so an emissions bypass would not work, unless it's really smart. (Only have 34mi left on countdown)
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      03-29-2022, 09:06 AM   #2
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I had the 200 mile countdown last month and indie changed both NOX sensors to the tune of $2k (ouch). They drove it, forced regen and it's working but I am sure something else with emission system will go wrong.
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      03-29-2022, 12:57 PM   #3
e90Noobie
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Quote:
Originally Posted by 826350350mw View Post
Hi everyone,

I am in search of some advice for my bmw 335d 2011. Since buying the car we have had lots of issues. We have replaced the EGR valve, done the walnut blasting for the CBU. Now, we got the 200mi countdown of death. We took it to BMW dealer and they said the Nox sensors could be bad as well as the def tank temperature and level sensors and need to replace the whole tank. We went ahead and ordered the replacement kit from Xemodex to replace the interworkings of the tank beneath the pump. After doing so, the countdown was still there. Took it in and got it recoded and flashed the computer then did a drive test perfectly, still showing the countdown. Was informed again to replace the tank, but decided to do some research on this forum and are going to try and do a DIY to fix the NoX sensors, as well as drain the tank, clean with water and refill, and check and clean the injector nozzle. When using the OBD reader the codes that were thrown were P207F, P20EE, 41F9, 474C, 4748, and 4D16. If you can give any information on how to try and have a cheaper a fix, and not spend $5,000, it would be extremely helpful. Anything to try and not just give up and sell the car. Also, I reside in California, so an emissions bypass would not work, unless it's really smart. (Only have 34mi left on countdown)
I would rinse the tank several times with distilled water. Fill, drive it a bit, and then drain and repeat. This way the water is getting pumped around the tank. Then rinse the metering unit(Injector) with distilled water. Then find some used NOX sensors from someone online(you can find them pretty cheap from someone who deleted their crap. Then make sure you fill the tank with the correct fluid.
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      04-01-2022, 08:51 PM   #4
moz335d
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Quote:
Originally Posted by 826350350mw View Post
Hi everyone,

I am in search of some advice for my bmw 335d 2011. Since buying the car we have had lots of issues. We have replaced the EGR valve, done the walnut blasting for the CBU. Now, we got the 200mi countdown of death. We took it to BMW dealer and they said the Nox sensors could be bad as well as the def tank temperature and level sensors and need to replace the whole tank. We went ahead and ordered the replacement kit from Xemodex to replace the interworkings of the tank beneath the pump. After doing so, the countdown was still there. Took it in and got it recoded and flashed the computer then did a drive test perfectly, still showing the countdown. Was informed again to replace the tank, but decided to do some research on this forum and are going to try and do a DIY to fix the NoX sensors, as well as drain the tank, clean with water and refill, and check and clean the injector nozzle. When using the OBD reader the codes that were thrown were P207F, P20EE, 41F9, 474C, 4748, and 4D16. If you can give any information on how to try and have a cheaper a fix, and not spend $5,000, it would be extremely helpful. Anything to try and not just give up and sell the car. Also, I reside in California, so an emissions bypass would not work, unless it's really smart. (Only have 34mi left on countdown)
All of my emissions stuff fell off, since its destined for the trash at this point, lmk what you need and I could practically send it to you for nearly just the shipping. If that would help any. 130k everything worked.
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