2003 Mitsubishi Diamante

Introduction

The 2003 Mitsubishi Diamante is a full-size sedan offered with two engine options: a 3.0L SOHC V6 and a 3.5L SOHC V6. The 3.0L engine produces 192 horsepower and 210 lb-ft of torque, while the 3.5L engine produces 245 horsepower and 247 lb-ft of torque. Both engines are mated to a 4-speed automatic transmission.

The Diamante is known for its spacious interior, comfortable ride, and powerful engine options. However, it has also been criticized for its dated exterior design, poor fuel economy, and lack of modern features.

Engine

3.0L SOHC V6

• Intake Manifold Gasket Failure
  • Description/Symptoms: Coolant leaks, overheating, rough idle, reduced engine power
  • Solution: Replace intake manifold gasket
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found
• Timing Belt Failure
  • Description/Symptoms: Engine rattling or squealing, loss of engine power, catastrophic engine failure
  • Solution: Replace timing belt and tensioner
  • Estimated Cost to Fix: $500 - $1,000
  • Recalls: None Found

3.5L SOHC V6

• No Issues Found

Transmission

4-Speed Automatic Transmission

• Shift Solenoid Failure
  • Description/Symptoms: Delayed or harsh shifting, slipping gears, no engagement
  • Solution: Replace shift solenoid pack
  • Estimated Cost to Fix: $500 - $800
  • Recalls: None Found
• Torque Converter Clutch Failure
  • Description/Symptoms: Slipping gears, shuddering or vibration during acceleration, reduced fuel economy
  • Solution: Replace torque converter
  • Estimated Cost to Fix: $1,000 - $2,000
  • Recalls: None Found

Suspension

• Strut Mount Failure
  • Description/Symptoms: Clunking or rattling noises over bumps, reduced handling
  • Solution: Replace strut mounts
  • Estimated Cost to Fix: $200 - $300
  • Recalls: None Found
• Tie Rod End Failure
  • Description/Symptoms: Wander or pulling during driving, uneven tire wear
  • Solution: Replace tie rod ends
  • Estimated Cost to Fix: $150 - $250
  • Recalls: None Found

Electrical

• Alternator Failure
  • Description/Symptoms: Dimming lights, battery discharge, electrical system failure
  • Solution: Replace alternator
  • Estimated Cost to Fix: $400 - $600
  • Recalls: None Found
• Starter Motor Failure
  • Description/Symptoms: Engine cranks but does not start, clicking or grinding noises
  • Solution: Replace starter motor
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found

Exterior

• Clear Coat Peeling
  • Description/Symptoms: Clear coat on paint surface peeling or flaking off
  • Solution: Repaint the affected areas
  • Estimated Cost to Fix: $500 - $1,000 (per panel)
  • Recalls: None Found
• Door Panel Rust
  • Description/Symptoms: Rust spots or bubbles on door panels
  • Solution: Repair or replace door panels
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found

Interior

• Airbag Malfunction
  • Description/Symptoms: Airbag warning light illuminated, airbag deployment failure
  • Solution: Inspect and replace airbag components as needed
  • Estimated Cost to Fix: $500 - $1,000
  • Recalls: 03V169000
• Gauge Cluster Failure
  • Description/Symptoms: Gauges malfunctioning or not displaying correctly
  • Solution: Replace gauge cluster
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found

Summary

The 2003 Mitsubishi Diamante is a generally reliable vehicle with few major issues. However, it does have some common problems that owners should be aware of, such as intake manifold gasket failure, timing belt failure, and alternator failure. These issues can be costly to repair, especially if not addressed promptly. Overall, the Diamante is a decent choice for a used sedan, but potential buyers should factor in the potential costs of these repairs when making a purchase decision.