Intake Air System and Exhaust System Symptom Troubleshooting Index

Symptom	Diagnostic procedure	Also check for
Engine abnormal noise while fuel cut-off control	Check for PGM-FI DTCs . Inspect the turbocharger bypass control valve vacuum hose for squashed or damaged. Check the turbocharger bypass control valve .
Engine low power	Check for PGM-FI DTCs . Inspect the intercooler for foreign materials or clogged. Inspect the intake air system for clogged. - Air cleaner element - Intercooler core