Ranger 2WD V6-182 3.0L (1995)
Heated Oxygen Sensor: Description and Operation
HEATED OXYGEN SENSOR #1 (upstream)
Heated Oxygen Sensor
PURPOSE
The Heated Exhaust Gas Oxygen Sensor #1
(HO2S) detects the presence of oxygen in the exhaust system and produces a variable voltage
according to the amount of oxygen present.
When operating in closed loop the Powertrain Control Module
(PCM) monitors this input and correspondingly changes the duration of the fuel
injection pulse width to achieve an air/fuel ratio of 14.7:1.
CONSTRUCTION
The sensor is a zirconium dioxide ceramic thimble with a platinum surface electrode. The sensor is threaded into the exhaust manifold with a
sampling tip extending into the exhaust stream.
Heated Oxygen Sensor Operation
