Vehicles using FA20F engine list:

Engine FA20F

Symptoms:
- Rough idling or misfires
- Loss of power or hesitation during acceleration
- Excessive oil consumption or oil leaks
- Check Engine Light (CEL) illumination
- Unusual knocking or tapping noises from the engine

Diagnosis:
- Perform a thorough visual inspection for oil leaks around the valve cover gasket and turbocharger area.
- Use an OBD-II scanner to check for stored trouble codes related to ignition, fuel delivery, or emissions.
- Conduct a compression test to assess cylinder health and detect possible head gasket issues.
- Inspect ignition coils and spark plugs for wear or fouling.
- Check turbocharger operation for unusual noises or boost pressure irregularities.

Fixes:
- Replace faulty ignition coils and spark plugs to resolve misfires and rough idling.
- Repair or replace leaking valve cover gaskets to prevent oil leaks and contamination.
- Address turbocharger issues by repairing or replacing worn components to restore proper boost.
- Perform an oil change with high-quality synthetic oil and replace the oil filter to reduce oil consumption.
- If compression test indicates head gasket failure, consider professional engine repair or rebuild.

Prevention:
- Follow the manufacturer’s recommended maintenance schedule, including regular oil and filter changes using Subaru-approved synthetic oil.
- Use high-quality fuel to prevent carbon buildup and maintain combustion efficiency.
- Avoid aggressive driving when the engine is cold to reduce stress on components.
- Regularly inspect and replace ignition components as needed to maintain smooth engine operation.
- Monitor engine performance and address any warning signs promptly to prevent further damage.