E 350 V10-6.8L VIN S (2006)
Typical Bank 1 Catalyst 2 HO2S Configuration
Typical Bank 1 Catalyst 3 HO2S Configuration
The purpose of the exhaust system is to convey engine emissions from the exhaust manifold to the atmosphere. Engine exhaust emissions are directed
from the engine exhaust manifold to the catalytic converter through the front exhaust pipe. A HO2S is mounted on the front exhaust pipe before the
catalyst. The catalytic converter reduces the concentration of CO, unburned HCs, and NOx in the exhaust emissions to an acceptable level. The
reduced exhaust emissions are directed from the catalytic converter past another HO2S mounted in the rear exhaust pipe and then on into the muffler.
Finally, the exhaust emissions are directed to the atmosphere through an exhaust tailpipe.
On some PZEV, there is a total of 3 HO2S in the exhaust stream. One near the exhaust manifold (stream 1), one in the middle of the light-off catalyst
(stream 2), and the third (stream 3) is mounted after the light-off catalyst.
Underbody Catalyst
The underbody catalyst is located after the light off catalyst. The underbody catalyst may be in-line with the light off catalyst, or the underbody
catalyst may be common to 2 light off catalysts, forming a Y pipe configuration. For an exact configuration of the catalyst and exhaust system for a
specific vehicle, refer to Catalytic Converter, Exhaust System.
Three-Way Catalytic (TWC) Converter
The TWC converter contains either platinum (Pt) and rhodium (Rh) or palladium (Pd) and rhodium (Rh). The TWC converter catalyzes the oxidation
