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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 > BMW Fault Code 4804 - Reducing Agent no reducing agent pressure build-up possible



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      03-27-2017, 08:56 AM   #1
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BMW Fault Code 4804 - Reducing Agent no reducing agent pressure build-up possible

Has anyone had and fixed this code before?
I'm not sure if the problem is a part covered by the emissions warranty.

I'm at 99,xxx.

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      03-27-2017, 09:10 AM   #2
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From reading a post from another forum, it might be the supply module?

Is this part difficult to change? I never even took a look near the active tank area.

http://www.realoem.com/bmw/enUS/show...28#16197244137
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