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Q:
i got a p0401 code, and my check engine light is on.how do i fix this problem? on 1999 Toyota Avalon

i took apart the egr valve, was not cloged, cleaned the sensor it worked fo a week then the same problem returned.
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in your case its usually not the egr valve itself.check for restrictions in the piping heading to the egr valve.
I had the same problem.... But After driving with the ECT PWR button on the dash, the check engine light disappeared after about 100 miles or so (maybe a little more) and never showed again. It may not be a guaranteed solution for your car but certainly a possibility if you have this ECT PWR button.
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