Onboard diagnostics (OBD) systems have been around since the 1980s and were developed to help limit harmful automotive exhaust emissions. Between 1988 and 1995, U.S.-built vehicles came with what’s now known as OBDI (OBD1) technology. These systems will display a check engine light (CEL) if the car’s computer detects an issue with any emissions-related equipment. In 1996, that technology was overhauled, and OBDII (OBD2) was released. OBDII is much more comprehensive than OBDI and allows us to read diagnostic
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