28a0-bmw

A persistent check engine light (CEL) or drivetrain malfunction warning. Common Causes & Solutions

Significant or the vehicle entering "limp mode". Decreased fuel economy.

: 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.

: 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.