IsItAGoodCar

Common Problems with the
2005–2012 Mazda MX-5 (NC)

We've identified 4 known issues that can affect the 2005–2012 Mazda MX-5 (NC). 1 of these are serious faults that could be expensive to repair.

4
Known Issues
1
Serious
2
Moderate
1
Minor

The 2005–2012 period has 2 more issues than the Mazda MX-5 (NC) average across all year periods.

All Known Issues

Rear Sill and Arch Corrosion

SeriousBodywork & Rust

Road salt and trapped moisture cause the metal to rot from the inside out.

Estimated cost: £500–£1,500Affects: 2005–2012

Typical symptoms

  • •Bubbling paint on rear arches
  • •Crunchy sound when pressing sills

What to inspect before you buy

  • ✓Look behind the plastic trim and feel the inner arch lip

Ignition Coil and Spark Plug Misfire

ModerateEngine

The NC MX-5 is prone to misfires caused by deterioration of the thin wiring to the ignition coils, which leads to coil failure. Symptoms include rough idle, hesitation under acceleration and the engine management light. The fix is typically new coils and plugs.

Most affected: 1.8 MZR, 2.0 MZR

Estimated cost: £150–£350Affects: 2005–2015Often appears around: 40,000–80,000 miles

Typical symptoms

  • •Misfire at idle or under load
  • •Engine management light flashing
  • •Rough running or hesitation

What to inspect before you buy

  • ✓Listen for a smooth idle from cold
  • ✓Check for stored misfire codes
  • ✓Ask when the coils and plugs were last replaced

Soft-Top Window Hazing and Water Ingress

ModerateBodywork & Rust

The plastic rear window on the soft-top can haze or craze with age, reducing rear visibility. More seriously, the roof seals and rain rails can fail, letting water into the cabin and accelerating sill corrosion from the inside.

Estimated cost: £0–£400Affects: 2005–2015

Typical symptoms

  • •Hazy or opaque rear window
  • •Damp carpets behind the seats
  • •Musty smell after rain

What to inspect before you buy

  • ✓Check rear visibility through the plastic window
  • ✓Feel the carpets and rear shelf area for damp
  • ✓Inspect the rain rail and roof drain exits for blockages

Hydraulic Valve Lifter Tick

MinorEngine

A loud ticking noise from the engine, especially when cold, is often caused by sticking hydraulic valve lash adjusters. This is more common on higher-mileage cars or those that have not had regular oil changes. Replacing the adjusters resolves the noise.

Most affected: 1.8 MZR, 2.0 MZR

Estimated cost: £200–£500Affects: 2005–2015Often appears around: 60,000+ miles

Typical symptoms

  • •Ticking noise from engine on cold start
  • •Noise reduces or disappears once warm
  • •Persistent tick at idle

What to inspect before you buy

  • ✓Listen to the engine from cold
  • ✓Ask about oil change intervals
  • ✓Check if the noise worsens after the car has been sitting for a few days

Buying Tips for the 2005 Mazda MX-5 (NC)

  • ✓Check the chassis rails and rear wheel arches for rust. This is the #1 killer of NCs.
  • ✓Ensure the drains are clear (water in the footwells usually means clogged drains).
  • ✓Check the oil level frequently; the 1.8 engine is known to consume oil if driven hard.
2013–2015 Mazda MX-5 (NC)

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Other Mazda MX-5 (NC) Year Periods

2005–20122013–2015

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