Mountaineer 2WD V6-245 4.0L VIN X SFI (2000)
the engine configuration and number of cylinders.
Exhaust Pipes
Exhaust pipes are usually treated during manufacturing with an anti-corrosive coating agent to increase the life of the product. The pipes serve as guides
for the flow of exhaust gases from the engine exhaust manifold through the catalytic converter and the muffler.
Upstream Heated and Downstream Heated Oxygen Sensors
The HO2S provide the Powertrain Control Module (PCM) with voltage and frequency information related to the oxygen content of the exhaust gas.
(Refer to the PCM Inputs for a description of how the H02S operates.)
In addition to providing the PCM with indications of how rich/lean the engine is operating, the upstream HO2S signal serves as an input to the H02S
monitor. The downstream HO2S signal is an input to the Catalyst Efficiency monitor. (Refer to the OBD II Monitors for specific information on these
monitors.)
Muffler
Mufflers are usually treated during manufacturing with an anti-corrosive coating agent to increase the life of the product. The muffler reduces the level of
noise produced by the engine, and it also reduces the noise produced by exhaust gases as they travel from the catalytic converter to the atmosphere.
