Explorer Sport Trac 4WD V6-245 4.0L SOHC VIN K SFI (2001)
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.
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
HO2S monitor. The downstream HO2S signal is an input to the Catalyst Efficiency monitor.
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.
