Automotive Glossary

Automotive Glossary

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Heated Exhaust Gas Oxygen Sensor. Also EGO Exhaust Gas Oxygen Sensor, EOS Exhaust Oxygen Sensor and Lambda sensor. Provides information to the fuel system ECU on the oxygen content in the exhaust gas.


High Energy Ignition. A distributor ignition system using electronic control of the coil secondary output.

Helical Gear

A gear with teeth cut at an angle.

Helical Rotor

A turbine or compressor in a turbocharger often has vanes that are helically shaped.

Helical Spring

Metal spring used in vehicle suspension. Also known as a coil spring.


A sphere is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball - a hemisphere is half a sphere


A fuel used in research tests as a comparison when determining the octane rating of fuels. Octane value of zero.


The number of oscillations per unit of time. The SI unit for frequency is the Hertz which equals one oscillation per second.


Short for hexagonal.



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