2004 Mitsubishi Montero

The 2004 Mitsubishi Montero is a mid-size SUV known for its off-road capabilities and spacious interior. The sole engine option for this model year is a 3.8-liter V6 engine, producing 215 horsepower and 252 lb-ft of torque. It was offered with a 4-speed automatic transmission. Owners generally appreciate the Montero’s ruggedness, ample cargo space, and comfortable ride, especially on rough terrain. Common dislikes include relatively poor fuel economy and some reported reliability concerns as the vehicle ages.

Engine

3.8L V6

• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks from the valve cover gasket, leading to oil consumption, burning oil smell, and visible oil residue on the engine.
  • Solution: Replace the valve cover gaskets.
  • Estimated Cost to Fix: $200 - $400+
• Catalytic Converter Failure
  • Description/Symptoms: Check engine light illuminated, poor fuel economy, reduced engine performance, and a rattling noise from under the vehicle.
  • Solution: Replace the faulty catalytic converter.
  • Estimated Cost to Fix: $500 - $1200+

Transmission

4-Speed Automatic

• Delayed or Harsh Shifting
  • Description/Symptoms: Transmission hesitates when shifting gears, shifts roughly, or fails to shift altogether. Can be more pronounced when cold.
  • Solution: Begin with a transmission fluid flush and filter change. If the problem persists, valve body repair or replacement may be necessary. In severe cases, a transmission rebuild or replacement is required.
  • Estimated Cost to Fix: $150 (fluid change) - $3000+ (rebuild/replacement)

Suspension

• Worn Ball Joints
  • Description/Symptoms: Clunking or popping noises from the front suspension, especially when going over bumps or turning. Uneven tire wear. Loose steering.
  • Solution: Replace worn ball joints.
  • Estimated Cost to Fix: $300 - $600+ per side
• Sagging Rear Suspension (Air Suspension Models)
  • Description/Symptoms: Rear of the vehicle sags, especially when loaded or overnight. The air compressor may run constantly or fail.
  • Solution: Inspect and repair or replace air springs, air compressor, and associated lines. Converting to a standard coil spring suspension is also a common solution.
  • Estimated Cost to Fix: $500 - $1500+ (air suspension repair) or $800 - $2000+ (coil spring conversion)

Electrical

• Power Window Motor Failure
  • Description/Symptoms: Window operates slowly or not at all.
  • Solution: Replace the faulty power window motor.
  • Estimated Cost to Fix: $200 - $400+ per window
• Alternator Failure
  • Description/Symptoms: Battery light illuminated, dimming headlights, slow engine cranking, or a dead battery.
  • Solution: Replace the faulty alternator.
  • Estimated Cost to Fix: $300 - $600+

Exterior

• Rust on Undercarriage and Body Panels
  • Description/Symptoms: Visible rust forming on the frame, rocker panels, wheel wells, and other areas of the body. Common in regions with road salt usage.
  • Solution: Remove surface rust and apply rust inhibitor. Replace heavily rusted panels.
  • Estimated Cost to Fix: $200+ (rust removal and treatment) to $1000+ (panel replacement)

Interior

• Climate Control Fan Motor Failure
  • Description/Symptoms: Blower motor stops working or only works on certain settings.
  • Solution: Replace the blower motor and/or resistor.
  • Estimated Cost to Fix: $150 - $400+

Recalls

• None Found

Summary

The 2004 Mitsubishi Montero, while capable, can be prone to certain issues as it ages. Engine issues such as valve cover leaks and catalytic converter failures are common. Transmission problems, particularly related to shifting, may require fluid changes or more extensive repairs. Suspension components like ball joints and air springs are also known to wear out, contributing to handling problems. Electrical issues can arise with power windows and the alternator. Rust is a concern, especially in areas with road salt. The severity of these issues ranges from minor annoyances to major repairs, with costs varying accordingly. Proactive maintenance can help mitigate some of these problems, but potential buyers should be aware of these common issues and budget accordingly.