2004 Mazda Miata

The 2004 Mazda Miata, also known as the NB Miata, is a beloved two-seat roadster celebrated for its agile handling, simple mechanics, and fun driving experience. The sole engine option for the 2004 model year is the 1.8L DOHC inline-4 engine, producing approximately 142 horsepower and 125 lb-ft of torque. Transmission options include a 5-speed manual, a 6-speed manual (available on certain trims), and a 4-speed automatic. Owners often praise the Miata’s responsive steering, balanced chassis, and the joy of open-top motoring. Conversely, some common complaints include limited storage space, a small cabin, and susceptibility to rust, especially in areas where salt is used on roads during winter.

Engine

1.8L DOHC Inline-4

• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks from the valve cover gasket, leading to oil consumption and potential oil dripping onto the exhaust manifold, causing a burning smell.
  • Solution: Replacement of the valve cover gasket.
  • Estimated Cost to Fix: $50 - $150+
  • Recalls: None Found
• Oil Leaks From Front Main Seal
  • Description/Symptoms: Oil leaks from the front main seal, leading to oil consumption and potential oil dripping.
  • Solution: Replacement of the front main seal.
  • Estimated Cost to Fix: $100 - $300+
  • Recalls: None Found

Transmission

5-Speed Manual

• Hard Shifting into 2nd Gear
  • Description/Symptoms: Difficulty shifting into 2nd gear, especially when cold. Grinding may occur.
  • Solution: Transmission fluid change with a high-quality synthetic fluid; potentially a rebuild of the transmission if the issue persists.
  • Estimated Cost to Fix: $50 - $150+ for fluid change, $800 - $2000+ for rebuild.
  • Recalls: None Found

6-Speed Manual

• Clutch Failure
  • Description/Symptoms: Slipping clutch, difficulty engaging gears, high RPMs without acceleration.
  • Solution: Replacement of the clutch disc, pressure plate, and throwout bearing.
  • Estimated Cost to Fix: $500 - $1200+
  • Recalls: None Found

4-Speed Automatic

• Shifting Issues
  • Description/Symptoms: Hard or delayed shifting, slipping between gears, erratic shifting behavior
  • Solution: Start by checking and replacing the transmission fluid, if issues persist, it may require replacement of the transmission.
  • Estimated Cost to Fix: $100 - $200+ for fluid change, $2,000 - $4,000+ for replacement.
  • Recalls: None Found

Suspension

• Worn Bushings
  • Description/Symptoms: Clunking noises from the suspension, especially over bumps. Poor handling and steering response.
  • Solution: Replacement of worn bushings (e.g., control arm bushings, sway bar bushings).
  • Estimated Cost to Fix: $100 - $500+ per corner, depending on the bushings replaced.
  • Recalls: None Found
• Failed Shocks/Struts
  • Description/Symptoms: Bouncy ride, poor handling, excessive body roll.
  • Solution: Replacement of shocks and struts.
  • Estimated Cost to Fix: $400 - $1000+ for all four corners.
  • Recalls: None Found

Electrical

• Faulty Window Regulators
  • Description/Symptoms: Slow or non-functional power windows.
  • Solution: Replacement of the window regulator.
  • Estimated Cost to Fix: $150 - $400+ per window.
  • Recalls: None Found
• Instrument Cluster Issues
  • Description/Symptoms: Intermittent or complete failure of gauges in the instrument cluster.
  • Solution: Repair or replacement of the instrument cluster.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust formation, particularly in the rocker panels, rear quarter panels, and around the drain holes.
  • Solution: Rust repair or panel replacement, followed by painting.
  • Estimated Cost to Fix: $500 - $5000+ depending on the severity and extent of the rust.
  • Recalls: None Found
• Soft Top Issues
  • Description/Symptoms: Tearing or cracking of the soft top material, especially around the seams and windows. Leaks during rain.
  • Solution: Repair or replacement of the soft top.
  • Estimated Cost to Fix: $200 - $1000+ depending on the quality of the replacement top and installation costs.
  • Recalls: None Found

Interior

• Broken Cupholders
  • Description/Symptoms: The flimsy, often poorly designed cupholders are prone to breaking
  • Solution: Replacement of the cupholders with aftermarket solutions.
  • Estimated Cost to Fix: $20 - $50+
  • Recalls: None Found
• Center Console Latch Failure
  • Description/Symptoms: The center console latch breaks, making it difficult to keep the console closed.
  • Solution: Replacement of the latch or entire center console.
  • Estimated Cost to Fix: $20 - $150+
  • Recalls: None Found

Summary

The 2004 Mazda Miata, while a joy to drive, has its share of common issues. Rust is a significant concern, especially in certain climates, and can lead to expensive repairs. Other issues, such as soft top problems and electrical glitches, are relatively common. Engine and transmission issues are generally less frequent but can still occur with age and mileage. Overall, prospective buyers should carefully inspect any 2004 Miata for rust, check the condition of the soft top, and be aware of potential electrical and suspension issues. Addressing these common problems can range from a few hundred dollars for minor repairs to several thousand for more extensive work.