The Oxygen Sensor, a part of the emission control system, is used to estimate the ratio of air and fuel in the engine's combustion chamber. The amount of oxygen in the exhaust is measured by the sensor and sent to the engine control unit (ECU). The ECU makes adjustments in the fuel injection to attain optimal efficiency.
Locating the Oxygen Sensor:
#1 Cylinder is the Key to Locating the Oxygen Sensor!
In a V-type motor, Sensor One(s) are in the exhaust system before the catalytic converter.
In an inline motor, the Rear Sensor (or Sensor Two) is in the exhaust system after the catalytic converter.
Location of the Oxygen Sensor Bank:
The illustrations below represents the typical engine mounting configurations. There are many variations depending on make and model. The buyer should take care to choose the correct sensor for the specific application location.
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