OBDlink OL129 OBD/EOBD+CAN code reader from AUTOOL supports 10 modes of OBD tests for a complete diagnosis and battery power monitor. When it comes to diagnosing Check Engine issues you\'d never go wrong with the new OL129 code reader. It offers such useful information for entry-level Pros and savvy DIYer that they can quickly and efficiently troubleshoot OBD2/EOBD problems on today\'s vehicles, meantime also watch out the battery power situation.