Oxygen Sensor Training Guide
Defintions of Terminology
|Air Fuel Ratio.
|A/F Ratio Sensor
|A four wire, heated oxygen sensor that more precisely measures A/F ratio than do traditional sensors.
|A sensor made to replace OE sensors.
|Powertrain Control Module
|Electronic Control Module
|Check Engine Light.
|Closed Loop Mode
|When the oxygen sensor(s) are operational in a vehicle’s diagnostics
|Diagnostic Trouble Code
|Direct Fit Sensor
|A sensor with a connector that fits an existing connector directly.
|Do It Yourself. An individual that works on his or her own vehicle.
|The sensor position after the catalytic converter. Also known as post-cat.
|Engine Control Unit
|Fast Light Off Sensor. This design can reach operating temperature in as little as 10 seconds.
|An oxygen sensor design that utilizes an internal heater.
|A condition where there is an excess of oxygen in the exhaust stream
|Malfunction Indicator Lamp
|The current onboard diagnostic language used by passenger vehicles.
|A sensor that is installed on a factory vehicle
|Open Loop Mode
|When the oxygen sensor(s) are not engaged in a vehicle’s diagnostics
|A sensor made of layers of zirconia & alumina bonded together, allowing for faster warm up of the sensor
|A condition where there is a shortage of oxygen in the exhaust stream
|The ideal air fuel ratio of 14.7:1 air: fuel by mass for gasoline engines
|A sensor design that employs the use of titanium instead of zirconia
|Ultra Fast Light Off Sensor. The oxygen sensor design that will reach operating temperature in the least amount of time possible.
|A sensor with no connector that must be installed through splices
|An early, basic sensor design that relies on external heat
|The sensor position before the catalytic converter. Also known as pre-cat
|A five wire, heated oxygen sensor that utilizes patented technology to provide a better measurement of A/F ratio than do four wire sensors
|A white, crystalline compound that is used in oxygen sensors