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The AOS fails because it is plastic
And your car is more than a few years old and the plastic is exposed to repeated heat cycles. It generally fails by cracking in one of several places.
The AOS tubing enters the airstream downstream of the MAF. The MAF is generally contaminated by a dirty air filter or over oiling of the K&N air filter...which isn't the best filter, incidentally, as it lets through more dirt.
Normally, if an AOS failure contaminates something it is the O2 sensors in the exhaust system. And the throttle body.
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