2004 Subaru Legacy

2004 Subaru Legacy

Overview

The 2004 Subaru Legacy, a mid-size sedan and wagon, offered a blend of all-wheel-drive capability and practical comfort. It was available with a range of boxer engines and manual or automatic transmissions, catering to different driving preferences. While generally considered a reliable vehicle for its era, certain components and systems have shown tendencies for specific issues that owners should be aware of. This analysis focuses on documented common problems beyond routine maintenance, providing insights into potential repair areas and their associated costs for the 2004 model year.

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Engine

2.5L Naturally Aspirated (EJ253)

Head Gasket Failure

• Symptoms: Coolant leaks, white smoke from exhaust, engine overheating, milky oil.
• Solution: Replacement of head gaskets and often associated components like head bolts.
• Cost: $1200 - $2500

Oil Leaks

• Symptoms: Visible oil drips under the vehicle, low oil level, burning oil smell.
• Solution: Replacement of seals and gaskets (e.g., valve cover gaskets, oil pan gasket).
• Cost: $300 - $700

2.5L Turbocharged (EJ255)

Head Gasket Failure

• Symptoms: Similar to naturally aspirated, but can be exacerbated by higher cylinder pressures.
• Solution: Replacement of head gaskets and associated components.
• Cost: $1300 - $2600

Turbocharger Failure

• Symptoms: Loss of power, excessive smoke, whining or grinding noises from the turbo.
• Solution: Turbocharger rebuild or replacement.
• Cost: $1000 - $2000

Transmission

5-Speed Manual Transmission

Clutch Wear

• Symptoms: Slipping clutch, difficulty shifting gears, burning smell.
• Solution: Clutch kit replacement (clutch disc, pressure plate, release bearing).
• Cost: $700 - $1200

4-Speed Automatic Transmission

Harsh Shifting / Slipping

• Symptoms: Jerky gear changes, delayed engagement, slipping between gears.
• Solution: Transmission fluid and filter change, solenoid replacement, or full transmission rebuild.
• Cost: $500 - $2500

Suspension

Standard Chassis

Worn Ball Joints and Bushings

• Symptoms: Clunking noises over bumps, vague steering, uneven tire wear.
• Solution: Replacement of worn ball joints and suspension bushings.
• Cost: $400 - $800

Rear Wheel Bearing Failure

• Symptoms: Humming or grinding noise from the rear that increases with speed.
• Solution: Replacement of rear wheel bearings.
• Cost: $300 - $600

Electrical

General Electrical System

Alternator Failure

• Symptoms: Dimming headlights, battery warning light, dead battery.
• Solution: Replacement of the alternator.
• Cost: $400 - $700

Window Regulator Failure

• Symptoms: Power windows not operating, slow window movement, grinding noise.
• Solution: Replacement of the window regulator mechanism.
• Cost: $200 - $400

Exterior

Body and Paint

Rust on Wheel Arches and Rocker Panels

• Symptoms: Visible corrosion and bubbling paint on lower body panels.
• Solution: Rust repair and repainting.
• Cost: $300 - $1000+

Interior

Cabin Components

HVAC Blower Motor Failure

• Symptoms: No air coming from vents or intermittent airflow.
• Solution: Replacement of the blower motor and resistor.
• Cost: $200 - $400

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Summary Verdict

The 2004 Subaru Legacy is a capable vehicle, but potential buyers and current owners should be aware of common issues, particularly head gasket failures on both naturally aspirated and turbocharged engines, which can be costly to repair. Transmission issues, especially with the automatic, and wear on suspension components like ball joints and bushings are also noted. Electrical problems such as alternator failure and window regulator issues can arise. Exterior rust, especially in certain climates, and interior HVAC blower motor failures are also points to consider. Despite these potential drawbacks, many Legacys have proven durable with proper maintenance and timely repairs.