How to Reset Lexus Codes

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You can reset the Lexus trouble codes at home in your garage, saving yourself time and money. If you don't have an OBD scan tool, you can reset the codes using just a wrench and about a half hour of your time. The Lexus comes standard with an On-Board Diagnostics (OBD) computer that stores the trouble codes and alerts you via warning and service lights on your instrument panel. Only reset the codes after you have had the vehicle serviced or repaired. Resetting them prematurely will only result in the service and warning lights turning themselves back on.

Things You'll Need

  • Wrench
  • Park on a flat, level surface and engage the parking brake. Shut off the engine and pop up the hood.

  • Look for a retaining bolt on the negative battery cable clamp. Loosen this nut with a wrench and slip the clamp off the battery post. Make sure the clamp doesn't touch the positive side of the battery or any metal surface.

  • Wait for 30 minutes for the electricity to drain out of the computer.

  • Put the negative cable clamp back onto the negative battery post and tighten the bolt. Lower the hood and start the engine. Notice that all service and warning lights are off. Drive for 45 minutes or longer to allow the computer to reprogram itself.

Tips & Warnings

  • You will have to reset the Lexus' clock and radio presets because you zeroed out the computer.

References

  • "Toyota Highlander and Lexus RX-330, 1999-2006"; Lexus; 2007
  • "Chilton's Toyota/Lexus Repair Manual, 1988-1992"; Chilton; 1992
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