An Oxygen Sensor (O
2
S) or heated Oxygen Sensor (HO
2
S) is used on all engines. The sensor is mounted in the right
side exhaust manifold on some V8 engines, while other V8 engines use a
sensor in both right and left manifolds.
Heated oxygen sensors are located in the exhaust pipes below the exhaust
manifolds. The sensors react with the oxygen in the exhaust gasses and
generates a voltage based on this reaction. A low voltage indicates too
much oxygen or a lean condition. Where as a high voltage indicates not
enough oxygen or a rich condition.
Disconnect the Oxygen Sensor (O
2
S). Measure resistance between PWR and GND (heater)
terminals of the sensor. If the reading is about 6 ohms at 68°F (20°C).
the sensor's heater element is okay.
Hope this helps (remember to rating this free answer).
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I am trying to locate the oxygen sensors on my 1994 Ford F150 5.0L V8, AT
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