The 2009 Legacy’s most common problems center on aging powertrains, particularly the 2.5-liter engine, plus issues that affect the automatic transmission, turbocharged variants, and cooling/electrical systems. While many owners report solid reliability, these are the areas that tend to come up most often as the car accrues miles.
Engine and powertrain
As the heart of the Legacy, the 2.5L engine in this generation shows several age-related trouble spots. Understanding these issues helps buyers assess risk and plan maintenance.
Head gasket leaks and oil seepage
Many 2.5L EJ-series engines from this era are prone to head gasket leaks as they age, which can allow coolant to mix with oil or coolant to seep into the combustion chamber. Symptoms include milky oil, overheating, coolant loss without obvious leaks, and, in some cases, white exhaust. Early diagnosis and repair are important to avoid more serious damage.
Oil consumption and leaks
Several 2.5L engines exhibit higher-than-average oil consumption or oil leaks from valve covers, seals, or the oil pan. Regular monitoring of oil level and prompt addressing of oil spots under the vehicle can help prevent unexpected low-oil conditions and related wear.
Turbo-related issues (2.5GT)
The turbocharged 2.5GT variant adds performance but can introduce turbo wear, boost-control problems, and intercooler hose leaks with higher mileage. Symptoms include reduced boost, misfires, or abnormal exhaust sound, and may require inspection of turbo piping and related seals.
Transmission and driveline
Drivetrain components contribute to a number of complaints as these cars age, especially in earlier automatics and those with higher mileage.
Automatic transmission concerns
Owners of 4-speed automatic models report rough or delayed shifting, occasional slipping, or harsh engagements, particularly as mileage climbs. Internal wear or aging seals can lead to fluid leakage and heat-related wear. Regular transmission service with the manufacturer-recommended fluid can mitigate symptoms, though severe cases may require rebuilding or replacement.
Drivetrain wear and AWD components
The all-wheel-drive system can reveal wear in CV joints, boots, and wheel bearings. Clunks, vibration on acceleration, or grinding noises may indicate worn components that should be inspected and replaced to preserve AWD performance and driving comfort.
Cooling, heating, and electrical systems
Aging cooling and electrical systems are common trouble areas, with problems ranging from leaks to sensor and wiring faults. These issues can lead to overheating or nuisance warning lights if not addressed.
Cooling-system leaks and failures
Leaks from the water pump, radiator, hoses, or thermostat housing are among the frequent cooling-system faults. If not repaired promptly, leaks can cause overheating and potential engine damage. Regular inspection and timely replacement of worn parts are advisable.
Electrical sensors and miscellaneous faults
Electrical gremlins—such as intermittent sensor failures, ABS/wheel-speed sensor warnings, or door/window regulator quirks—are occasionally reported. Diagnostic work is often needed to pinpoint failing modules, but these issues are usually cosmetic or intermittent rather than catastrophic.
Suspension, brakes, and safety items
As with many mid-2000s Subarus, wear in suspension and braking components is common with higher mileage. Keeping these parts in good condition is essential for ride quality and safety.
Wear in suspension components
Struts, bushings, and related hardware can wear over time, leading to clunks, reduced steering feel, and a harsher ride. Suspension work is typical after around 100,000 miles, depending on driving conditions and maintenance history.
To help prospective buyers and current owners gauge risk, note patterns in maintenance history, driving style, and mileage when evaluating these problems. Pay special attention to coolant and oil levels, transmission behavior, and any unusual noises from the engine or drivetrain.
Before considering a purchase or planning maintenance, verify open recalls and service campaigns for a 2009 Legacy via official channels such as NHTSA or Subaru’s recall database. Addressing recalls and conducting a thorough pre-purchase inspection with a qualified mechanic can uncover these issues before they become costly repairs.
Common problems often vary by mileage, trim, and maintenance history. A diligent owner or buyer who follows a proactive inspection and service plan can manage these risks effectively.
Maintenance and inspection tips below can help minimize surprises and extend the life of a 2009 Legacy.
To help prospective buyers and current owners gauge risk, here are practical steps and checks that can help prevent or catch these issues early.
- Engine health: inspect for coolant/oil leaks around the engine, check for milky oil indicating head-gasket trouble, and monitor coolant level and temperature during a test drive.
- Oil management: track oil consumption and look for oil spots under the vehicle; address leaks or consumption soon to avoid engine wear.
- Transmission care: schedule regular automatic transmission service with the correct fluid specification; be alert for rough shifting or slipping and have any symptoms diagnosed promptly.
- Turbo-specific checks (2.5GT): inspect turbo hoses and intercooler for leaks, monitor boost pressure, and listen for unusual turbo sounds.
- Cooling system: inspect water pump, radiator, hoses, and thermostat; replace worn parts before leaks or overheating occur.
- Electrical and sensors: monitor warning lights, diagnose intermittent sensor faults, and repair or replace faulty modules as needed.
- Drivetrain and AWD: inspect CV boots, wheel bearings, and joints for wear or leaks; replace as necessary to maintain AWD performance.
- Suspension and brakes: check struts, bushings, and brakes regularly; address uneven wear or noises to maintain handling and safety.
Maintenance checklist continued: follow the Subaru Schedule for service intervals, use the recommended fluids, and perform preventive maintenance on cooling, transmission, and drivetrain components to mitigate the common issues noted above.
Summary: The 2009 Subaru Legacy remains a solid choice for many buyers, but it carries age-related risks typical of mid-2000s Subarus. The most frequently cited problems involve the 2.5L engine’s head gasket and oil leaks, oil consumption, automatic transmission behavior, turbo issues on the GT variant, and cooling/electrical system aging. A thorough pre-purchase inspection and adherence to a proactive maintenance plan—plus attention to recalls—can help owners avoid major repairs and keep the car running smoothly.
Summary
In short, the 2009 Legacy can be dependable with attentive maintenance, but buyers should be mindful of engine and transmission wear, turbo-related concerns on the GT model, and cooling/electrical system aging. Regular inspections, timely repairs, and adherence to the manufacturer’s maintenance schedule are key to maximizing reliability for this model year.