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The simple and convenient automotive diagnostic fault code checker.



The regulatory intent of OBD-I was to encourage auto manufacturers to design reliable emission control systems that remained effective for the vehicle's "useful life". The hope was that by forcing annual emissions testing for California, and denying registration to vehicles that did not pass, drivers would tend to purchase vehicles that would reliably pass the test. OBD-I was largely unsuccessful, as the means of reporting emissions-specific diagnostic information was not standardized by vehicle manufacturers. Technical difficulties with obtaining standardized and reliable emissions information from all vehicles led to an inability to implement the annual testing program effectively.