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Q: Humming noise on 2006 Toyota Tundra

After changing the air filter to a more expensive life time filter my truck started to make a humming noise when I would go 65mph and over. Could this be a serious problem beginning to start?
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first of all, get rid of the filter. put back the replacable unit. the k/n you purchased has oil in the element that contaminates the sensors.
the noise may be that the housing is not sealing correctly.

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