Active Regeneration can occur in two manners, in automatic mode or in parked mode.

• A. Automatic mode or Parked mode
• B. Automatic and Manual
• C. Parked and Manual
• D. Automatic mode only

Answer: (A)

Active regeneration is the process used to clean the diesel particulate filter by burning off accumulated soot. This can happen automatically when the engine control system detects the right conditions, or it can be performed while the vehicle is parked.

In automatic mode, the system initiates regeneration as you drive, based on soot load and exhaust temperature, so you don’t need to stop to perform it. In parked mode, regeneration is done with the vehicle stationary—typically with the parking brake set and the engine kept at a higher, controlled RPM—to generate the heat needed for a longer, safer burn without moving.

Therefore, the two manners described—automatic mode and parked mode—are the correct pairing. Other options would imply a manual option or limit regeneration to automatic only, which isn’t how these systems are typically designed to operate.