Gas sensor with protection tube for exhaust system

A method of manufacturing an exhaust system for a vehicle having an internal combustion engine, the method comprising:

• providing an exhaust pipe configured to receive an exhaust gas flow from the engine at a predetermined first velocity;
• coupling an exhaust gas sensor assembly to the exhaust pipe to be in fluid communication with an interior of the exhaust pipe to sense a predetermined constituent contained within the exhaust gas flow;
• providing the exhaust gas sensor assembly with a sensing element disposed at least partially within a protection tube assembly having a plurality of apertures configured to receive a sensor flow (SF) portion of the exhaust gas flow;
• and
• providing the plurality of apertures with a combined total flow area that provides a surface averaged total velocity at the sensing element to be greater than or equal to 70% of the first velocity to thereby increase a dynamic response of the exhaust gas sensor assembly.