On-Board Diagnostics reach a new level of sophistication with the implementation of OBD II (On-Board Diagnostics Second Generation). The Powertrain Control Module (PCM) monitors the emissions system and its components to detect deterioration or malfunction.

• The PCM stores and retrieves diagnostic messages to help technicians diagnose and fix problems quickly and accurately
• The PCM alerts the driver by illuminating the "Service Engine Soon" light when it detects a deterioration in the performance of any of the monitored systems
• Unlike first-generation systems that signaled only system failures, OBD II alerts the driver to have the vehicle serviced before experiencing a possible break down or incurring more expensive repairs.

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