Question

QUESTION 4

Technician A says that most engine OEMs recommend that customers have the DPF removed and cleaned obce a year to minimize
DPF sintering. Technician B that says that the DPF needs to be actively regenerated at every oil change. Who is correct?
O a. Technician A
b. Technician B
OG Both Technician A and Technician B
O d. Neither Technician A nor Technician B
QUESTION 5
Technician A says that DPFs were used only in HD diesel engines until 2010, when they were replaced with SCR systems.
Technician B says that only a DPF can remove particulate emissions from the exhaust. Who is correct?
O a. Technician A
O b. Technician B
O c. Both Technician A and Technician B
O d. Neither Technician A nor Technician B

Answer 1

Answer to Question 4: Neither Technician A nor Technician B is correct. The Diesel Particulate Filter (DPF) should not be removed and cleaned once a year to minimize DPF sintering. Instead, it should be actively regenerated when it becomes full of soot. There is no need to regenerate the DPF at every oil change.

Answer to Question 5: Technician B is correct. Only a Diesel Particulate Filter (DPF) can remove particulate emissions from the exhaust. However, Technician A is incorrect. DPFs are still used in HD diesel engines, and they were not replaced by Selective Catalytic Reduction (SCR) systems in 2010. Instead, SCR systems are often used in conjunction with DPFs to reduce both particulate matter and NOx emissions.