MaxiScan MS300 compact pocket code reader - Turn off check engine light The MS300 OBD2 scanner is an easy-to-use plug-and-play code reader that reads and clears codes. It retrieves generic (P0, P2, P3, and U0), manufacturer specific (P1, P3, and U1) codes, and pending codes, helping you identify what caused the check engine light and turn off the MIL. Note: It does not supports full engine system; if you need full coverage please consider ML629/MK808BT PRO, etc. - Freeze frame data for accurate diagnosis This MS300 reader includes a freeze frame function to retrieve data recorded by the ECU at the fault condition, helping explain why the check engine light is on and reducing test-drive time. It provides parameters such as RPM, vehicle speed, mass airflow, engine load, fuel pressure, short/long term fuel trim, engine coolant temperature, and more. - Readiness status to pass smog check The MS300 includes an I/M Readiness function to check Emission System operations on OBD2 compliant vehicles. It reports monitors such as misfire, fuel system, comprehensive components, O2 sensors, EVAP, and more, aiding you in preparing your vehicle to pass the annual smog check. - Unmatched compatibility MaxiScan MS300 supports all OBD2 protocols: KWP2000, ISO2000, ISO9141, J1850 VPW, J1850 PWM and CAN. It works with all OBDII-compliant vehicles, passenger cars or light trucks. For OBD2 cars, typically EU cars after 2006, Asian cars after 2009, US cars after 1996. Note: It does NOT supports ABS, brake, SRS, full Engine systems, etc. If you need broader coverage, please consider ML629/MK808BT PRO or above. - Use scenarios 1) At home diagnostics: plug in, read and clear codes after repairing, verify MIL is off. 2) Pre-inspection prep: run I/M Readiness to ensure emission monitors are ready for smog testing. 3) Technician hand-off: pull freeze frame data to communicate fault conditions clearly to a mechanic.