OBDII Diagnostic Trouble Codes (DTC’s)
OBDII, California’s second generation of OBD requirements, is a diagnostic system incorporated into the vehicle’s powertrain computer that is designed to assist in pollution reduction and prevention. The OBDII system monitors virtually every component and system that can affect emissions during normal driving, alerting the driver through a dashboard malfunction indicator light (MIL) and storing fault code information for technicians.

