2003 INFINITI M45

Introduction

The 2003 INFINITI M45 is a luxurious full-size sedan known for its spacious interior, powerful engine, and sophisticated styling. It comes standard with a 4.5-liter V8 engine, delivering 340 horsepower and 333 lb-ft of torque, paired with a 5-speed automatic transmission.

Engine

4.5-liter V8

• Intake Manifold Gasket Failure: Leaks coolant and oil, causing overheating and engine damage. Solution: Replace intake manifold gaskets. Estimated Cost to Fix: $1,000 - $1,500+
• Valve Body Solenoids: Malfunction, causing transmission shifting problems and hesitation. Solution: Replace valve body solenoids. Estimated Cost to Fix: $300 - $500+
• Oil Pressure Sensor Failure: Fails, resulting in inaccurate oil pressure readings and potentially engine damage. Solution: Replace oil pressure sensor. Estimated Cost to Fix: $100 - $200
• Timing Chain Tensioner Failure: Fails, allowing the timing chain to slip and causing engine damage. Solution: Replace timing chain tensioner. Estimated Cost to Fix: $1,500 - $2,000+

Transmission

5-Speed Automatic

• Transmission Fluid Leaks: Leak fluid, causing transmission slippage and damage. Solution: Repair or replace transmission fluid lines. Estimated Cost to Fix: $300 - $500+
• Torque Converter Lockup Failure: Fails, causing transmission shuddering and overheating. Solution: Replace torque converter. Estimated Cost to Fix: $1,000 - $1,500+
• Transmission Control Module (TCM) Failure: Malfunctions, causing transmission shift problems and hesitation. Solution: Replace TCM. Estimated Cost to Fix: $500 - $700+

Suspension

• Strut Mount Failure: Causes excessive noise, vibration, and poor ride quality. Solution: Replace strut mounts. Estimated Cost to Fix: $400 - $600+

Electrical

• Alternator Failure: Fails, causing the battery to drain and the vehicle to stall. Solution: Replace alternator. Estimated Cost to Fix: $500 - $700+
• Battery Drain: Battery drains prematurely due to parasitic draw from electronic components. Solution: Diagnose and repair parasitic draw. Estimated Cost to Fix: $200 - $400+
• Navigation System Malfunction: Malfunctions, causing display or navigation issues. Solution: Update or replace navigation system software. Estimated Cost to Fix: $500 - $700+

Exterior

• Headlight Assembly Condensation: Moisture buildup in headlight assemblies causes fogging and reduced visibility. Solution: Replace headlight assemblies with sealed versions. Estimated Cost to Fix: $500 - $700+ per side

Interior

• Climate Control Malfunction: Malfunctions, leading to poor heating or cooling performance. Solution: Diagnose and repair climate control system. Estimated Cost to Fix: $300 - $500+
• Center Console Trim Detachment: Trim pieces detach from the center console, causing rattling noises. Solution: Secure loose trim pieces. Estimated Cost to Fix: Free - $100

Overall Summary

The 2003 INFINITI M45 has several potential mechanical issues to be aware of, particularly with the engine and transmission. These issues can range from minor inconveniences to serious and expensive repairs. It’s important to maintain the vehicle regularly and address any issues promptly to minimize the likelihood of major breakdowns.