See also:

Abbreviation list
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Emission inspection and maintenance (I/M) progra
Some states have vehicle emission inspection programs which include OBD (On Board Diagnostics) checks. The OBD system monitors the operation of the emission control system.  - If the malfunc ...

Disabling the TRAC or Active TRAC/VSC systems
If the vehicle gets stuck in fresh snow or mud, the TRAC or Active TRAC/ VSC systems may reduce power from the engine to the wheels. You may need to turn the system off to enable you to rock the v ...