2004 Mercedes-Benz ML350

The 2004 Mercedes-Benz ML350 is a mid-size luxury SUV known for its comfortable ride and overall build quality for its time. The standard engine is a 3.7-liter V6 producing 232 horsepower and 254 lb-ft of torque. Other engine options included a 4.3-liter V8 and a 5.0-liter V8. It was only available with a 5-speed automatic transmission. Owners often praise its reliability, handling, and interior comfort, while common complaints include electrical gremlins, fuel economy, and some suspension component wear.

Engine

3.7L V6

• Check Engine Light - Failed Mass Air Flow (MAF) Sensor
  • Description/Symptoms: The check engine light illuminates, the engine may run rough, experience poor fuel economy, or stall. The vehicle may exhibit reduced power and acceleration. Diagnostic codes often include those related to the MAF sensor.
  • Solution: Replacement of the faulty MAF sensor.
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found
• Oil Leaks (Valve Cover Gaskets)
  • Description/Symptoms: Oil leaking from the valve covers onto the exhaust manifolds, creating a burning smell. Visible oil residue around the valve covers is also common.
  • Solution: Replacement of the valve cover gaskets.
  • Estimated Cost to Fix: $250 - $500
  • Recalls: None Found

Transmission

5-Speed Automatic

• Harsh Shifting/Slipping
  • Description/Symptoms: The transmission shifts hard or slips between gears, especially when cold. The vehicle might hesitate during acceleration.
  • Solution: Replacement of conductor plate in transmission, valve body rebuild, or a transmission replacement.
  • Estimated Cost to Fix: $500 - $3500+
  • Recalls: None Found

Suspension

• Worn Ball Joints/Control Arm Bushings
  • Description/Symptoms: Clunking noises from the front suspension, especially when going over bumps. The vehicle may wander or have vague steering. Tire wear may be uneven.
  • Solution: Replacement of worn ball joints and/or control arm bushings.
  • Estimated Cost to Fix: $300 - $800 per side
  • Recalls: None Found
• Air Suspension Compressor Failure (If Equipped)
  • Description/Symptoms: The rear of the vehicle sagging, the air suspension warning light illuminating, and the compressor failing to engage. The vehicle may ride harshly.
  • Solution: Replacement of the air suspension compressor.
  • Estimated Cost to Fix: $600 - $1200+
  • Recalls: None Found

Electrical

• Malfunctioning Instrument Cluster
  • Description/Symptoms: The instrument cluster gauges (speedometer, tachometer, fuel gauge, etc.) may become erratic, stop working altogether, or display incorrect readings.
  • Solution: Repair or replacement of the instrument cluster.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• Failed Window Regulator
  • Description/Symptoms: The power windows stop working or move erratically. A grinding or clicking noise may be heard when attempting to operate the window.
  • Solution: Replacement of the faulty window regulator.
  • Estimated Cost to Fix: $200 - $400 per window
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: The door locks may fail to lock or unlock, either manually or with the remote.
  • Solution: Replacement of the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $400 per door
  • Recalls: None Found

Exterior

• Rust (Wheel Wells/Underbody)
  • Description/Symptoms: Visible rust forming on the wheel wells, rocker panels, and underbody of the vehicle, especially in areas exposed to road salt.
  • Solution: Repair of the rusted areas through welding, patching, or panel replacement. The vehicle may require repainting.
  • Estimated Cost to Fix: $500 - $2000+ (depending on severity)
  • Recalls: None Found

Interior

• Sunroof Issues (Sticking/Failure to Open or Close)
  • Description/Symptoms: The sunroof may stick, operate slowly, or fail to open or close completely. A grinding noise may be heard.
  • Solution: Cleaning and lubrication of the sunroof tracks and mechanism. Replacement of the sunroof motor or cables may be necessary.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Summary The 2004 Mercedes-Benz ML350, while a comfortable and capable SUV, is prone to certain issues due to its age. The most common problems revolve around electrical components and suspension wear. Engine and transmission issues are also present, with potential costs ranging from a few hundred dollars to several thousands for major repairs. The severity of the issues can vary depending on the vehicle’s maintenance history and location (exposure to rust-inducing conditions).