Question

Technician A says that most all EPA MY 2013 highway compliant diesel engines use SCR. Technician B says that an SCR system relies on replenishing DEF on a regular basis. Who is

correct?
a) Technician A only
b) Technician B only
c) Both A and B
d) Neither A nor B

Answer 1

Both Technician A and Technician B are correct.

Step-by-step explanation:

Both Technician A and Technician B are correct.

Technician A is correct because most EPA MY 2013 highway compliant diesel engines do use SCR (Selective Catalytic Reduction) systems. SCR is a technology used to reduce nitrogen oxide (NOx) emissions in diesel engines.

Technician B is also correct because an SCR system relies on replenishing DEF (Diesel Exhaust Fluid) on a regular basis. DEF is a solution of urea and water that is injected into the exhaust system to convert NOx emissions into harmless nitrogen and water.