2004 Subaru Legacy Reliability ReportKeepScore 75/100 · top failure points · buy or avoid
Quick Facts · 2004 Subaru Legacy
- Scores 3 points below the strongest nearby year — the 2006 Subaru Legacy earns a 78.
- The system most likely to surface first: engine (2.5l head gaskets) (major severity).
- Has 11 NHTSA recalls on record — the most notable involves the air bags:frontal:passenger side:inflator module.
2004 Subaru Legacy: Buy or Avoid?
The 2004 Subaru Legacy is a capable, all-wheel-drive sedan that can be a great value if you understand its specific Achilles' heels. While often lauded for its robust AWD system and durable drivetrain once common issues are addressed, neglecting critical maintenance, particularly concerning the engine, can quickly turn it into a money pit. This vehicle demands a thorough pre-purchase inspection and a clear service history to truly offer dependable long-term ownership.
The 2004 Subaru Legacy offers a compelling package of AWD capability and practicality, but it comes with significant caveats, primarily the notorious 2.5L head gasket failures and pervasive rust issues. For the right buyer who is diligent with maintenance, has a clear service history, and is prepared for potential r…
Best Model Years
2000-2004 (with 3.0L H6 engine), or 2000-2004 (2.5L with documented head gasket replacement)
Years to Avoid
2000-2004 2.5L models with no service history or unaddressed head gasket issues.
Biggest Strengths
- Symmetrical All-Wheel Drive system provides superior traction
- Robust frame and excellent crash safety ratings for its era
- Generally durable transmissions if regularly serviced
2004 Subaru Legacy — Known Trouble Spots
The systems that tend to fail first on the 2004 Subaru Legacy, with the typical mileage window when each becomes a concern. Detailed repair-cost ranges and exact what-to-check inspection notes are in the full report.
The 2.5L SOHC EJ25 engine is notorious for external oil/coolant leaks from the head gaskets, and eventually internal failure leading to overheating or coolant mixing with oil. This is due to material degradation over time.
Subframes, brake lines, fuel lines, and rear wheel arches are highly susceptible to severe rust, especially in regions with road salt. This can compromise safety and lead to costly repairs or structural failure.
Lower control arm bushings, ball joints, sway bar end links, and steering rack seals frequently wear out, leading to clunks, loose steering, and fluid leaks. This is typical wear for an AWD vehicle of its age.
2004 Subaru Legacy Mileage Danger Zones
The mileage windows when the 2004 Subaru Legacy most commonly needs attention. Plan ahead, budget accordingly, and inspect before you cross each threshold.
Low Risk Zone
At this mileage, the Legacy is generally trouble-free. Focus on routine oil changes, tire rotations, and cabin air filter replacements.
Maintenance Zone
This mileage typically requires a significant maintenance check, including spark plugs, differential fluids, and potentially brake service. The 2.5L engine is nearing its timing belt replacement interval soon.
Elevated Risk Zone
Crucial mileage for the 2.5L timing belt service (if not done already) and the looming threat of head gasket issues. Suspension components will likely start showing significant wear.
High Risk Zone
Beyond 120k, all major systems are candidates for failure. Head gaskets on the 2.5L are a near certainty if not previously addressed, and severe rust can become a structural concern. Expect more frequent and costly repairs.
2004 Subaru Legacy Ownership Cost Outlook
What it typically costs to keep the 2004 Subaru Legacy on the road. Full 5-year cost-of-ownership projection and major-failure-risk forecast are in the report.
Annual Maintenance
$400-600
Moderate Repairs
$500-1,500 occasionally
How Long Does the 2004 Subaru Legacy Last?
Focus on well-maintained examples under 100,000 miles if possible, or those with comprehensive service records explicitly showing head gasket replacement on the 2.5L engine. High mileage units (150,000+) are best reserved for experienced Subaru owners or those with mechanical aptitude.
What 2004 Subaru Legacy Owners Actually Say
What Owners Love
- Exceptional Symmetrical AWD system provides confidence in all weather.
- Comfortable ride quality for daily commuting and long trips.
- Spacious and practical interior with ample cargo room when folding rear seats.
- Good visibility and easy to maneuver in urban environments.
Common Frustrations
- The constant anxiety over the 2.5L head gasket issue and associated repair costs.
- Significant rust accumulation, especially on critical components, in affected regions.
- Interior plastics can feel cheap and are prone to cracking or showing wear prematurely.
- Fuel economy is often just average, not stellar for its size.
Who Should Buy the 2004 Subaru Legacy?
Best For
- Drivers in snowy or wet climates needing reliable AWD traction.
- Budget-conscious buyers who appreciate simple, robust mechanicals (post-HG fix).
- Those who can perform basic DIY maintenance or have access to an affordable independent Subaru mechanic.
Not Ideal For
- Buyers seeking absolute, set-it-and-forget-it reliability.
- Anyone who cannot afford potentially significant repair bills (e.g., head gaskets, rust repair).
How the 2004 Subaru Legacy Compares to Rivals
The Legacy offers superior AWD capability compared to most direct competitors, but often falls short in long-term engine reliability (2.5L) and rust protection compared to Japanese rivals like the Camry and Accord.
More Reliable Than
- Volkswagen Passat (of the same era)
- Chrysler Sebring
- Older American AWD sedans (e.g., Pontiac Grand Prix AWD)
Comparable To
- Nissan Altima
- Mitsubishi Lancer (N/A models)
- Ford Focus (early 2000s)
Safety Recalls on the 2004 Subaru Legacy
11 recalls on record from NHTSA. Check your VIN atnhtsa.gov to see if the repair was performed.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Subaru of America, Inc. (Subaru) is recalling certain 2009-2013 Forester, 2003-2006 Baja, 2004-2011 Impreza, 2004-2014 WRX (including STI), 2003-2014 Legacy and Outback, and 2005-2006 Saab 9-2X vehicles originally sold, or ever registered, in the states of Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming or "Zone C." These vehicles had their passenger frontal air bag inflators previously replaced under a prior recall using inflators of the same design. The inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Subaru of America, Inc. (Subaru) is recalling certain 2009-2013 Forester, 2003-2006 Baja, 2004-2011 Impreza, 2004-2014 WRX (including STI), 2003-2014 Legacy and Outback, and 2006 Saab 9-2X vehicles originally sold, or ever registered, in the states of Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia or "Zone B." These vehicles had their passenger frontal air bag inflators previously replaced under a prior recall using inflators of the same design. The inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.
What breaks on the 2004 Subaru Legacy?
Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.
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Subaru Legacy — Year-by-Year Comparison
Compare KeepScores across nearby years of the Subaru Legacy. Click any year for its full report.
Competing 2004s Worth a Look
Similar class, similar year range — ranked by KeepScore.
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Frequently Asked Questions
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