![]() The “check engine” or “service engine soon” light is the signal that there is a problem with the vehicle’s emissions. These as well as everything in the vehicle having to do with engine performance and emissions control are continuously monitored by the vehicle’s on-board computer system. Its basic components are the catalytic converter and strategically-placed oxygen sensors. The OBD2 system is primarily for emissions control. from 1996 to the present, domestic and imports. ![]() The “II” is the next generation of emissions standards and codes for all vehicles sold in the U.S. The “OBD” of OBDII – sometimes written OBD-II or just plain OBD2 – stands for On-Board Diagnostics. You’ve hooked up your scanner to the vehicle computer and retrieved the OBDII diagnostic code. When the “check engine” or “service engine soon” light comes on, it doesn’t tell you what or where the trouble is, only that there’s trouble.
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