A magnetic field sensor IC package (100, 300; 400), comprising: a sensing element (322; 464); an analog circuit path coupled to the sensing element for generating an output voltage proportional to a magnetic field applied to the sensing element; a coil (333; 433) in proximity to the sensing element, the coil having a first terminal that is accessible to provide a direct electrical connection to the coil from external to the magnetic field sensor IC package, wherein the coil is configured to carry a current to generate a magnetic field having an intensity corresponding to a level of the current; a device; a diagnostic module; a control module; a switch; and a threshold module, wherein the threshold module is coupled to the diagnostic module and configured to provide a normal operation threshold and a diagnostic threshold, wherein: during a normal operation, the device is configured to compare a voltage from the sensing element with the normal operation threshold and the control module is configured to receive an output of the normal operation comparison, and the control module is configured to control the switch for generating the output voltage based on the normal operation comparison output; characterized in that: during a diagnostic testing, the device is configured to compare a voltage from the sensing element to the diagnostic threshold and the control module is configured to receive an output of the diagnostic testing comparison, and wherein the control module is configured to control the switch for generating the output voltage based on the diagnostic testing comparison output. a sensing element (322; 464); an analog circuit path coupled to the sensing element for generating an output voltage proportional to a magnetic field applied to the sensing element; a coil (333; 433) in proximity to the sensing element, the coil having a first terminal that is accessible to provide a direct electrical connection to the coil from external to the magnetic field sensor IC package, wherein the coil is configured to carry a current to generate a magnetic field having an intensity corresponding to a level of the current; a device; a diagnostic module; a control module; a switch; and a threshold module, wherein the threshold module is coupled to the diagnostic module and configured to provide a normal operation threshold and a diagnostic threshold, wherein: during a normal operation, the device is configured to compare a voltage from the sensing element with the normal operation threshold and the control module is configured to receive an output of the normal operation comparison, and the control module is configured to control the switch for generating the output voltage based on the normal operation comparison output; during a normal operation, the device is configured to compare a voltage from the sensing element with the normal operation threshold and the control module is configured to receive an output of the normal operation comparison, and the control module is configured to control the switch for generating the output voltage based on the normal operation comparison output; characterized in that: during a diagnostic testing, the device is configured to compare a voltage from the sensing element to the diagnostic threshold and the control module is configured to receive an output of the diagnostic testing comparison, and wherein the control module is configured to control the switch for generating the output voltage based on the diagnostic testing comparison output. during a diagnostic testing, the device is configured to compare a voltage from the sensing element to the diagnostic threshold and the control module is configured to receive an output of the diagnostic testing comparison, and wherein the control module is configured to control the switch for generating the output voltage based on the diagnostic testing comparison output.