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The Check Engine and TRAC OFF lights are illuminated together indicating an engine-related malfunction. The TRAC system is most likely OK, but disabled because it cannot function correctly if there is a problem with a sensor or engine related system.

The car is safe to operate while these lights are illuminated, however you will have no traction control until the problem is resolved, and the system reset. Your ABS will still function normally unless that light is illuminated too. You may notice an increase in fuel consumption.

The fault codes that caused these lights to illuminate are stored in each respective computer's volatile memory. On a 1992 LS400, the codes can be retrieved by shorting two terminals on the diagnostic connector below the driver side dash panel. They will be displayed by a series of flashes by their respective light.

See this page for more information on retreiving the fault codes and resetting them.

http://www.lexls.com/tutorials/intro/codereading.html

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Q: 1992 Lexus LS400 trac off and engine light appeared while driving and remained on So far vehicle runs fine What might be cause or issue Is it safe to drive vehicle without causing damage?
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