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Sienna 2004...Just found out , the cel, vsc and trac off may come on if you change the air filter and disconnect the wire harness from the top of the filter housing. In this case it did throw air intake / mass airflow sensor codes.
Any time you get a cel after disconnecting any wire harness while working on the engine,
it is a good idea to reset the cel first, and see if it is bogus, related to the disconnect before taking it to the dealer.
If there is a real problem, the cel will come back on.
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