Quote:
Originally Posted by Bill-n-Brillo
Does the light that comes on say "Maintenance Required"? If so, that's not the same thing as a Check Engine light. The Maintenance Required light is just an indicator saying that x number of miles have gone by and it's time to change your oil.
There should be a procedure in your owner's manual for how to reset that light. If you can't find it, let me know the model year of your Highlander and I should be able to find the procedure for you.
Bill 
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Do a Google search on "how to reset maintenance light" for your vehicle and I am sure you will find out how to reset things. For my Toyota Camry it is just a matter of holding down the trip odometer and then turning the ignition key to the first notch (not starting the car) and it is reset and good for another 10,000 miles.
Google is your friend.
VG