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Common Sensor Variations.
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To be sure of fitting the correct replacement oxygen sensor it is good to have an understanding of the different types. The most common is the zirconia dioxide (Zirconia) sensor, which comes in heated and unheated form. There are several different types of zirconia sensor and some manufacturers use titanium dioxide (titania) oxygen sensors. Below is a general overview of each type of oxygen sensor:
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Zirconia 'thimble' type
Element type - zirconium dioxide, thimble
Types available - one, two, three and four wire, 18mm thread
Heater resistance - (3 and 4 wire sensors only) 2 to 6.5 ohms
Output signal - between 0.1 and 0.9 volts
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Titania
Element type - titanium dioxide, planar
Types available - three and four wire 12mm and 18mm thread
Heater resistance - 4 to 7 ohms.
Output signal - between 0 and 1 volt or between 0 and 5 volts
(depending on make and number of wires)
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| Function: |
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The Oxygen Sensor (also known as Lambda Sensor) is
located in the exhaust manifold and measures the amount of unburned oxygen in
your engine's exhaust. Based on the amount of oxygen, it sends a signal to your
engine computer which then adjusts the air/fuel mixture for optimum engine
performance and emission control.
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| Failure Symptoms: |
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- Excessive fuel consumption, a faulty oxygen sensor can waste 30% of your fuel.
- Driveability problems, such as engine surging or hesitation.
- High hydrocarbon emissions, failing an emissions inspection.
- The engine warning light may be on or service flag displayed.
- The ecu/computer stores a mixture-related fault code.
- When the oxygen sensor has stopped functioning completely, the catalytic converter may overheat and fail
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| Maintenance/Service: |
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- Test and/or replace every 30,0000 miles.
- Perform periodic emission checks.
- Watch for service light.
- Vehicle manufacturers recommend periodic inspection and replacement of oxygen sensor.
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