The "OBD I" systems were limited to monitoring only a few of the emission-related components and they were not calibrated to a specific level of emission performance. OBD II systems were developed to address these shortcomings, and make the system more user-friendly for service technicians. OBD capabilities with OBD II systems are incorporated into the hardware and software of a vehicle’s on-board computer for monitoring every component that can affect emission performance. Each component is checked by a diagnostic routine to verify that it is functioning properly. If a problem or malfunction is detected, the OBD II system illuminates a warning light on the vehicle instrument panel to alert the driver. This warning light will typically display the phrase “Check Engine” or “Service Engine Soon”. The system will also store important information about the detected malfunction so that a repair technician can accurately find and fix the problem.