If a Ford F150 is experiencing limp mode, there are several steps that can be taken to diagnose sensor issues. One option is to take the truck to a dealer to scan for diagnostic codes and have the issue documented[1]. Another option is to learn how to DIY diagnose the problem by watching videos or reading articles online[2][3][4]. It may also be helpful to clean the mass air flow sensor, as dirt on the sensor can send wrong values to the control unit and activate limp mode[5].