Inspect traffic condition, driving habit, vehicle condition, external circumstances etc.

Inspect engine hesitation, poor power, poor acceleration etc.

Inspect "Basic inspection".

Click on "Fuel" item and inspect fuel quality.

If fuel quality is normal, click on each possible causes item for more details. "Engine oil", "Tire and Tire pressure", "Air cleaner"

→ If all components are normal, perform "Suspected cause inspection" as below.