Out of the many dashboard warning lights that illuminate when starting or driving a modern car, the service engine and check engine lights are most often misunderstood or intertwined. Compounding the issue is not all vehicles have a service engine soon warning light. However, the law requires all cars since 1991 (1988 in California) to have an emission-controlling on-board diagnostics (OBD) system and a check engine warning light to remind drivers of possible engine, transmission, emissions, or electrical problems. There’s
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