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The "check engine" light is not solely dedicated to the air filter and pcv valve. There are other things that can cause this caution light to illuminate on the dashboard. Assuming you bought this car new and that it has but 37k miles on it, it's most likely still in warranty and Toyota should be fixing this problem for you.

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15y ago
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Q: My Toyota Highlander check engine light on my car has 37000 miles replaced air filter and PCV valve on 51508 what is the problem with the car?
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