2004 INFINITI M45

2004 INFINITI M45

Overview

The 2004 Infiniti M45, a luxury sedan, offered a blend of performance and comfort. Powered by a robust V8 engine, it aimed to compete in a segment known for its refinement. While generally well-regarded for its driving dynamics and upscale interior, like any vehicle of its age, it has certain areas where owners have reported issues. This analysis focuses on common technical reliability concerns beyond routine maintenance, providing insights into potential problem areas and their associated repair costs for prospective buyers or current owners.

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Engine

4.5L V8 (VK45DE)

Oil Leaks (Valve Covers/Gaskets)

• Symptoms: Visible oil on engine components, burning oil smell, low oil level.
• Solution: Replacement of valve cover gaskets or other seals.
• Cost: $300 - $600

Timing Chain Tensioner Wear

• Symptoms: Rattling noise from the front of the engine, especially on startup.
• Solution: Replacement of timing chain tensioners and guides.
• Cost: $1200 - $2000

Transmission

5-Speed Automatic (RE5R05A)

Harsh Shifting / Delayed Engagement

• Symptoms: Jerky gear changes, difficulty engaging gears, slipping.
• Solution: Transmission fluid and filter service, solenoid replacement, or full transmission rebuild.
• Cost: $400 - $2500

Suspension

Standard Chassis

Worn Ball Joints / Control Arm Bushings

• Symptoms: Clunking noises over bumps, vague steering, uneven tire wear.
• Solution: Replacement of worn ball joints and/or control arm bushings.
• Cost: $500 - $900

Electrical

General Electrical System

Instrument Cluster Malfunctions

• Symptoms: Flickering gauges, dead pixels on displays, intermittent power loss to cluster.
• Solution: Repair or replacement of the instrument cluster.
• Cost: $500 - $1000

Window Regulator Failure

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

Exterior

Body and Trim

Headlight Condensation

• Symptoms: Moisture or fogging inside headlight assemblies.
• Solution: Sealing headlight units or replacement.
• Cost: $100 - $500

Interior

Cabin Components

HVAC Blower Motor Failure

• Symptoms: No airflow from vents, intermittent fan speed, unusual noises from dashboard.
• Solution: Replacement of the HVAC blower motor.
• Cost: $250 - $500

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Summary Verdict

The 2004 Infiniti M45 is a capable luxury sedan with a powerful V8 engine. While it generally holds up well, common issues tend to revolve around age-related wear, particularly with oil leaks from the engine, potential timing chain tensioner wear, and transmission shifting problems. Electrical components like the instrument cluster and window regulators can also be points of concern. Suspension components like ball joints and bushings may require attention. Addressing these potential issues proactively can help maintain the M45’s luxury driving experience.