28a0-bmw

: The Digital Motor Electronics (DME) may lean out the fuel mixture to compensate for high intake pressure but eventually reaches its limit, triggering the code.

Significant or the vehicle entering "limp mode". Decreased fuel economy. 28a0-bmw

Are you experiencing any like stalling or misfires along with this code? : The Digital Motor Electronics (DME) may lean

: In some cases, the code appears after a battery registration. This can often be resolved by performing a DME/engine adaptation reset using a diagnostic tool like the Foxwell NT510 or similar BMW-specific scanners. Are you experiencing any like stalling or misfires

: This is the most frequent cause. Technicians often find leaks in the crankcase ventilation system , sometimes involving the VANOS solenoids or the valve cover itself.

: Check for carbon build-up or dirt within the throttle body that might prevent proper valve movement.

Experts on platforms like JustAnswer recommend checking for additional misfire codes (like P0300-P0306) which often accompany 28A0 when a vacuum leak is present.