Fitment: The OBD2 engine fault code reader is a replacement for Mercedes-Benz W211 R230 with SBC systems, allowing repairs without replacing the control module. Function: Scans car diagnostic trouble codes quickly to identify emission-related issues, reads and clears codes, displays DTC definitions, turns off the check engine light, checks I/M readiness status, retrieves freeze frame data and vehicle information. High Efficiency: Retrieves generic, manufacturer-specific, and pending codes within seconds, displays DTC definitions alongside codes for fast diagnosis, and allows clearing or resetting codes after repairs. Easy to Use: Each code is displayed with its definition to save time and effort, helping users quickly locate problem areas; ideal for DIYers and beginners. Operation: Plug into the OBDII port, turn on the ignition switch, wait for two beeps indicating normal operation, restore the maintenance mode switch when the Busy indicator is on, and complete data recovery after 10 seconds.