ELM327 is quite capable of resetting diagnostic trouble codes, this only requires issuing mode command. Consequences should always considered before sending however, more than Check Engine Light') will reset:
1.reset number trouble codes
2.erase diagnostic trouble codes
3.erase stored freeze frame data
4.erase that initiated freeze frame
5.erase oxygen sensor test data
6.erase mode information
Despite of Clearing this data unique elm327
occurs whenever scan tool used reset codes , the biggest problem with losing this data is that your vehicle may poorly short time, while performs recalibration. So you should remember that ELM327 does monitor content messages, will know confirmation mode request this would have duty software interface written. As stated, actually erase diagnostic trouble codes, need only issuebe running mode command and response from vehicle indicates that mode request been carried out, information erased and the MIL turned off. Some vehicles require special condition occur (eg. the ignition on but the engine must not running) before they will respond mode command. That there clearing trouble codes.
Once again, I want to inform you that you'd better accidentally not send the mode code! Otherwise，you must face the music. So,look before you leap.
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