Lexus Oxygen Sensors

Written by Jeremy Horelick
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Many Lexus vehicles are now being manufactured to comply with tougher emissions standards all across the country. In California in particular (which routinely seems to lead the nationwide charge), new legislation on NOX, CO, and HC emissions has meant changes in design, not only to Lexuses, but to all new cars. National low emissions vehicle (NLEV) standards require automakers to be far more exacting in their oxygen-sensing design blueprints.

In addition to the NLEV, Lexus must also bow to super ultra low emissions vehicle (SULEV) regulations as well. These hold automakers to the highest environmental standards yet. Both pieces of legislation, as well as California's own ultra low vehicle emissions laws, continues to prod manufacturers into developing state-of-the-art oxygen sensors, ECUs, and catalytic converters.

The Development of New Lexus Oxygen Sensors

As a company that's built its reputation largely on exclusivity and excellence, Lexus is right at the vanguard of pioneering technologies. For this reason, Lexus owners shouldn't be surprised to find that their traditional "heated" thimble sensors have been swapped out in favor of what are called "wideband" oxygen sensors. There may seem to be no obvious difference, but longtime drivers will certainly notice the effects.

Wideband sensors combine a two-part element with a five-wire sensing module to give these devices superior measurement capabilities. The details are highly technical, but suffice it to say that this new mechanism employs a "diffusion" gap to judge the difference in oxygen richness between a cathode and anode in the pump. This difference correlates directly with the amount of fuel that's to be taken into the cylinder in order to maintain the stoichiometrically balanced ratio.


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