W211 OM271 Air flow sensor not working

  mercedes/e-class/2003-2009

Hi guys, I have a W211 with a OM271 engine. The air flow sensor does not work. I have changed about 3 different AFM both used and New. Still not working. I have checkd the wiring of the air flow and the wires are ok. Could the issue be in the ECU? kindly advise as soon as possible.

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