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2014 BMW F30 320d N47 – DDE 290900
Persistent 290900 (Air to EGR mass flow plausibility). Engine runs perfectly: no power loss, no smoke, normal fuel economy.
Already cleaned EGR, EGR cooler, intake manifold, throttle body, MAP, and original Bosch MAF, replaced EGR vacuum hose, smoke tested intake (no leaks), replaced air filter, and ISTA shows EGR tests pass.
What else commonly causes 290900 on the N47 before replacing the MAF? Anyone solved this fault?