Gasoline Engines
WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The 6.2L gasoline engine exhaust Y-pipe has a dual catalytic converter with 2 Heated Oxygen Sensor (HO2S) and 2 Catalyst Monitor Sensor (CMS). Exhaust gas then flows through the resonator and out to the muffler and tailpipe assembly.
The 6.8L gasoline engine exhaust Y-pipe has 2 Heated Oxygen Sensor (HO2S). The exhaust gas then flows through the catalytic converter which has a CMS and then out to the muffler and tailpipe assembly.