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The ELM327 abstracts the low-level protocol and presents a simple interface that can be called via a UART, typically by a hand-held diagnostic tool or a computer program connected by USB, RS-232, Bluetooth or Wi-Fi.[2] New applications include smartphones.[3] There are a large number of programs available that connect to the ELM327.[4][5] The function of such software may include supplementary vehicle instrumentation, reporting and clearing of error codes. ELM327 Functions: Read diagnostic trouble codes, both generic and manufacturer-specific. Clear some trouble codes and turn off the MIL ("Malfunction Indicator Light", more commonly known as the "Check Engine Light") Display current sensor data Engine RPM Calculated Load Value Coolant Temperature Fuel System Status Vehicle Speed Short Term Fuel Trim Long Term Fuel Trim Intake Manifold Pressure Timing Advance Intake Air Temperature Air Flow Rate Absolute Throttle Position Oxygen sensor voltages/associated short term fuel trims Fuel Pressure