Other Fuel System Tank Assembly problems of the 2011 BMW X5

Vehicle's engine, being a diesel, requires nox trap system and scr systems in order to reduce harmful emissions per epa standards. In order for the scr system to work properly, the engine must inject def (diesel-exhaust fluid) into the scr system. In the BMW X5 35d, the def system is comprised of two tanks: the active tank and the passive tank. A common problem with this system is the primary sensor of the passive tank failing. The sensor itself fails, but the entire tank has to be replaced as a result of the sensor's issues, resulting in several thousands of dollars being spent due to the sensor itself not being able to be replaced in the original tank. Recall is recommended for BMW to replace these sensors as the failure of these sensors results in the scr catalyst system failing to operate, which in turn significantly decreases engine performance, increases exhaust emissions, and results in the engine not knowing the capacity on which to operate. This can be dangerous.

I have an 2011 X5 diesel. I got engine light on because of passive tank problem. I love the car but this car has so many ses lights after I got it. I fixed active tank out of my own pocket before they had extend warranty for active tank. Its lights on again and this time under covered. But after couple of month the passive tank got problem. I called BMW but they said it's not covered. It's $3000 again. I talked to dealer, dealer said it will not effect my drive because it's a back up tank (only be used if active tank broke) but it won't pass emission test. I am really frustrated with this ses light on and I did lots of research about passive tank. Lots of people had same problem and some got covered by BMW. I tried to communicate with BMW about the scr tank. Passive tank is the same component as active tank and it's back up tank. You already know these tanks have problem why cover only one and let costumer pay the other one. And why some covered some don't? this is really not fair and I can't pass emission test without fixing this engine light on. It's also really bother's me (engine light on) when I drive my car every day with my kids and don't know it there is any other problem except passive tank. Please help me on anyway you can. Thank you so much for your time!.

Crystallized diesel exhaust fluid (def) clogging selective catalyst reduction (scr) metering valve. Valve failure. Additional subsequent damage to def metering line, nox sensor, wiring, connectors, etc. Check engine light on. Multiple codes set in computer. Same issue with same scr metering unit part # 18 30 7 807 206 (bosch oem) as acknowledged in BMW technical service bulletin si b 18 04 12 which covers replacement of selective catalyst reduction (scr) metering unit in e90 series vehicles with same m57y diesel engine as my vehicle. BMW has extended warranty coverage for my vehicle to 10 years/120,000 miles for other related diesel exhaust fluid (def) issues, including, but not limited to active def tank/sensor, footwell module, egr/nox sensors, etc.