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What does the Subaru TGV sensor do? The sensor on each butterfly is there so the ECU can monitor the current position of the valve and decide whether it needs to be opened or closed.
Read MoreReplacement connectors for Subaru TGV error codes P1090, P1091, P1092, P1093. What do TGVs Do? When the engine is at idle, the TGVs close and force the incoming airflow through a smaller passage to increase the swirl of the air/fuel mixture, resulting in an engine that operates more cleanly.
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