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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 > SES Light - Code 4BAC - now 474C and 49A5



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      03-03-2017, 01:09 PM   #1
geost
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SES Light - Code 4BAC - now 474C and 49A5

Argh. My SES light came on on my way to work.

I pulled the code from Carly and it says:

4BAC: Reducing agent active tank level sensor signal sensor monitoring error.

I looked at this thread and it looks like the only way to fix it is to replace the DEF tank? http://www.e90post.com/forums/showthread.php?t=935056

Oh man. Looks like I have a costly repair bill coming up...? Anyone else have experience with the 4BAC code and how it was resolved? Thanks.

Edit: Forgot to include I'm well out of warranty, I have almost 83k miles.
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Last edited by geost; 03-16-2017 at 09:58 PM.
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      03-03-2017, 03:42 PM   #2
Torqu3
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Here, do this. I just saved your bank account. http://www.e90post.com/forums/showthread.php?t=1355409
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      03-03-2017, 04:48 PM   #3
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Quote:
Originally Posted by Torqu3 View Post
Here, do this. I just saved your bank account. http://www.e90post.com/forums/showthread.php?t=1355409
now he owes all of us at least 20$ for the help lol
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      03-06-2017, 11:30 PM   #4
geost
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Quote:
Originally Posted by Torqu3 View Post
Here, do this. I just saved your bank account. http://www.e90post.com/forums/showthread.php?t=1355409
Awesome thank you! I'll check it out. Hopefully that resolves it, if it does then that's some major $$ money saved!
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      03-16-2017, 09:57 PM   #5
geost
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Just a quick update. Shortly after the 4BAC code came on, I got the low DEF no start in 999 miles notification. Found out that the shop I took it to prior for an oil change and DEF refill did NOT refill the active tank. I bought DEF, added about 2 gallons, and the low DEF notice and SES 4BAC code went away automatically.

Now I have a new issue. Today I got the following:

Error code: 49A5 - Receive news of IBS LIN-bus communication
Error code: 474C - DFC

I did a few searches and found the following threads:

http://www.e90post.com/forums/showthread.php?t=953550
http://www.e90post.com/forums/showthread.php?t=1134503
http://www.e90post.com/forums/showthread.php?t=1175518

Looks like mixed responses. Some suggested replacing the glow plug controller, battery, or (possibly) replacing the glow plugs and or injectors.

My battery is 3 years old. I reset the codes for now, wondering if they'll appear again tomorrow. Anyone else experience 49A5 or 474C? I couldn't find a definitive answer or solution to these codes.
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      03-18-2017, 12:46 AM   #6
Yozh
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Quote:
Originally Posted by geost View Post

Now I have a new issue. Today I got the following:

Error code: 49A5 - Receive news of IBS LIN-bus communication
Error code: 474C - DFC

Looks like mixed responses. Some suggested replacing the glow plug controller, battery, or (possibly) replacing the glow plugs and or injectors.
Nothing to do with your glow plugs or your battery.
If you had your DEF tank empty and then refilled and code went away, you may wish to play with your DEF a bit more. If it is old, perhaps a DEF drain, flush and refill with fresh might do the trick. Flush is key as you may have some crystallization on the level sensors that may be throwing logic for a loop. Otherwise, there is thread somewhere that speaks to temp sensor replacement. Last step to replace the function unit as posted in the thread above. That will take care of the temp sensor too.

Here:

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Last edited by Yozh; 03-18-2017 at 01:08 AM.
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