Escort L4-122 2.0L SOHC VIN P SFI (1999)
Oxygen Sensor: Description and Operation
The up stream Heated Oxygen sensor (HO2S) is mounted in the exhaust manifold and senses the oxygen concentration in the exhaust gas. It sends this
information to the powertrain control module, which uses the information to determine fuel injection amounts. The sensing element is made of zirconia
ceramic with a platinum coating.
The downstream heated oxygen sensor is mounted on the muffler inlet pipe just below the Three Way Catalytic Converter (TWC).The downstream
heated oxygen sensor monitors the three way catalytic converter and transmits the information to the powertrain control module.
