Which outcome is most likely if the wastegate actuator on an automotive turbocharger fails closed?

💡 Explanation

When the wastegate actuator fails closed, turbocharger boost pressure increases unchecked, leading to overboost because the wastegate cannot vent excess exhaust gas around the turbine. Therefore, engine damage from overboost results, rather than reduced power, increased fuel consumption, or unstable RPM, which are unrelated consequences.

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