Which statement describes the fourth stage of regeneration?

Which statement describes the fourth stage of regeneration?

• A. DPF Flashing
• B. DPF Flashing; Check Engine Lamp; Stop Engine Lamps
• C. DPF Flashing; Check Engine Lamp
• D. Check Engine Lamp alone

Answer: (B)

Stage four is when the DPF is in regeneration and the warning signals escalate to a high-priority level for the operator. The DPF indicator flashing together with both the Check Engine light and the Stop Engine light tells you that regeneration is at a critical point and you must stop the vehicle safely to protect the engine and the exhaust system, then follow the prescribed procedure to complete regeneration or service. The other options don’t show the full, high-severity signal: flashing alone is an earlier stage; flashing with the Check Engine lamp but not the Stop Engine lamps is less urgent; the Check Engine lamp alone doesn’t indicate the need to stop the engine.

Stage four is when the DPF is in regeneration and the warning signals escalate to a high-priority level for the operator. The DPF indicator flashing together with both the Check Engine light and the Stop Engine light tells you that regeneration is at a critical point and you must stop the vehicle safely to protect the engine and the exhaust system, then follow the prescribed procedure to complete regeneration or service. The other options don’t show the full, high-severity signal: flashing alone is an earlier stage; flashing with the Check Engine lamp but not the Stop Engine lamps is less urgent; the Check Engine lamp alone doesn’t indicate the need to stop the engine.