Hi, I couldn't make the airspeed sensor work. It only shows numbers mainly below 1, sometimes it goes up to 1.1 and that's it. Doesn't matter if I blow into the pilot tube the number doesn't change significantly.

I'm using APM 2.5 with the plane 3.1.0 firmware.

I checked the wiring, connectors, polarity the tubes are not choked. It's enabled in mission planner plugged into port 0 on the APM. I have also done the preflight calibration but didn't help.

Any idea what else should I try or check?