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The idle air control valve of the Toyota Yaris, positioned in the engine bay and connected to the HVAC system, regulates the air flow into the engine to manage combustion and power output. Irregular functioning of this system can result in poor acceleration, shuddering, and stalling at idle. Continuously operating the vehicle under these conditions can lead to engine damage, necessitating immediate repair at an estimated cost of around $300, making it a relatively moderate fix.
In a Toyota Yaris, you can locate the idle control valve close to the throttle body on the intake manifold.