How to resolve BMW X5 fault code 28a0?

[DiRiver]

Check whether the fuel tank vent pipe is correctly embedded or inserted. Check whether the oil filler cap is sealed, inspect the intake pipe for proper sealing, and examine the crankcase interior for sealing integrity. Use an endoscope to check for carbon buildup on the intake valves.

[MirandaMarie]

I've recently dealt with quite a few cases of BMW X5's fault code 28a0 at the repair shop. It's usually related to the diesel engine's exhaust treatment system, particularly AdBlue injection issues. Common causes include low AdBlue fluid level, clogged nozzles, or sensor malfunctions. The first step should be checking the AdBlue tank level - if it's not full, simply top up with dedicated AdBlue fluid (BMW recommends OEM brand). Then reset the system using a diagnostic tool to see if the fault clears. If the problem persists, it might be damaged nozzles or pressure sensors requiring replacement, which typically costs a few thousand RMB. Ignoring it may lead to reduced engine power, excessive emissions, or even affect annual inspections. For safety, it's best to have a professional technician check the wiring with a multimeter to avoid damaging other components. For routine maintenance, remember to inspect the AdBlue system every few months to prevent many potential issues.