BMW X4 Diesel Refuses to Start, AdBlue System Alert

Hey there! I had a similar issue with my 2011 BMW X3 diesel last winter. The AdBlue system failed and I got the same warning. The problem was the connection between the tank and dosing unit, it was completely clogged up. Had it fixed at an independent BMW specialist. The mechanic showed me that the old dosing unit was actually corroded and the lines were blocked. They had to replace both the dosing module and clean out the entire system. It wasn't a quick fix, took them about 6 hours to sort everything out. This is quite a serious issue since the car won't run without a properly functioning AdBlue system. Definitely get it checked soon, leaving it too long can cause more damage to the SCR catalyst. Make sure whoever looks at it has experience with diesel emission systems. These AdBlue problems are pretty common on our BMWs from that era. Hope this helps.

This is incredibly helpful! My situation sounds exactly like what you described. Really good to know it's a known issue with these models. Can you remember roughly how much you paid for the whole repair? Also, has everything been running smoothly since the fix, or have you noticed any other AdBlue-related problems? Thanks again for sharing your experience!

Hey again! Happy to give you an update! After getting it fixed at my mechanic, I paid around 250€ for the repair, they had to replace the connection from the AdBlue tank to the dosing unit as it was completely shot. The best part is that everything's been running perfectly since then, no more warning lights or starting issues. It's been about 8 months now, and I haven't had a single AdBlue-related problem. My mechanic did a thorough job cleaning out the whole system while they were at it, which probably helped prevent any future issues. They mentioned these problems are pretty typical with our BMW diesels, so I'm just glad I got it sorted before it caused any bigger problems with the SCR system. Trust me, once you get it fixed, you'll be good to go. Just make sure your mechanic knows their way around diesel emission systems, it makes all the difference. Let me know how it goes with yours!

Thanks so much for all your help, I took your advice and found a mechanic who specializes in BMW diesels. Just got my car back yesterday and wanted to update you on how it went. You were spot on, it was exactly the same issue. The mechanic found the clogged connection and corroded dosing unit. The repair cost was actually pretty similar to what you paid. They did a complete system clean while they were at it too. The car's running like a dream now! Started right up this morning with no warning lights. Such a relief to have it sorted. The mechanic was great too, showed me all the damaged parts and explained everything clearly. Really appreciate you sharing your experience, helped me avoid what could've been a much bigger headache at the dealer. Thanks again for pointing me in the right direction!