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i think toyota took the stand that since not enough people were complaining, they'd ignore it. i admit that i never noticed that mine were flickering until i read the posts and then looked for it, and sure enough they were. it is caused by the a/f sensors. i think that the alternator is minimally adequate for the job it must perform. older cars didn't have as much problem, but these newer ones have so much that runs off the electric. engine computer and many sensors, trans computer, body computer, higher watt headlights, heating and air, premium stereos that draw more and on and on. when batteries are cold, or start to get weaker, they can't compensate as quickly for the draw and the flickering gets worse. the only real fix is to probably put in a higher amp alternator. guys who put custom stereos in cars with big amps and speakers that need lots of power are used to this. i saw a post on another thread that a guy said the highlander alternator is a direct replacement for the avy at a higher 130 amps, so maybe thats the fix. until toyota were to admit they have a poor design, there will prob never be a fix from the dealer, and on these older cars, chances of that are nill.
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Lights flickering
Linear Mode
