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The United States Environmental Protection Agency (U.S. To verify that your vehicle is equipped with OBD II, you can look for the words 'OBD II' on the emission control information label attached to the underside of the vehicle hood. Additionally, a small number of 19 model year gasoline vehicles were equipped with OBD II systems. All 1997 and newer model year diesel fueled passenger cars and trucks are also required to meet the OBD II requirements. Does my car have OBD II?Īll 1996 and newer model year gasoline and alternate fuel passenger cars and trucks are required to have OBD II systems. OBD II works to ensure that the vehicles remain as clean as possible over their entire life. Studies estimate that approximately 50% of the total emissions from late-model vehicles are excess emissions, meaning that they are the result of emission-related malfunctions. While the new vehicles in California may start out with very low emissions, improper maintenance or faulty components can cause vehicle emission levels to sharply increase. Why is OBD II needed?Įven though new vehicles sold in California are the cleanest in the world, the millions of cars on the road and the ever increasing miles they travel each day make them our single greatest source of smog forming emissions. OBD II was developed to address these shortcomings and make the system more powerful and user-friendly for service technicians. Required starting with the 1988 model year, OBD I systems were not fully effective because they were limited to monitoring only a few of the emission-related components, and the monitors were not calibrated to a specific level of emission performance. On-Board Diagnostic I (OBD I) was California's first OBD regulation which required manufacturers to monitor some of the emission control components on vehicles.

The system will also store important information about any detected malfunction so that a repair technician can accurately find and fix the problem. This warning light will typically display the phrase 'Check Engine' or 'Service Engine Soon,' and will often include an engine symbol. If a problem or malfunction is detected, the OBD II system illuminates a warning light on the vehicle instrument panel to alert the driver. Each component is checked by a diagnostic routine to verify that it is functioning properly. On-board diagnostic capabilities are incorporated into the hardware and software of a vehicle's on-board computer to monitor virtually every component that can affect emission performance. OBD II is an acronym for On-Board Diagnostic II, the second generation of on-board self-diagnostic equipment requirements for light- and medium-duty California vehicles.

Wow snooper diagnostic tool change governor speed