Iconic lightweight roadster, pure driving joy
The Mazda MX-5 remains the world's best-selling two-seat sports car and a UK favourite. Mk1 (NA) cars are now appreciating classics, Mk2 (NB) models offer cheap thrills from £2,000-£5,000, Mk3 (NC) models sit at £5,000-£10,000, and current ND generation cars start from around £14,000 used. The third-generation NC has never been recalled by Mazda, while the ND was substantially revised in 2019 as the ND2.
We track 11 known issues across the Mazda MX-5 range, including 2 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Mazda MX-5? Enter the reg to see which of our 11 known issues apply to that exact car, plus full MOT history and mileage checks.
NB (1998–2005) — Engine options included the 1.6 16v, 1.6 VVT, 1.8 VVT, 1.8 VVT. Our database flags 6 known issues on this generation, 2 of which are rated as safety-critical. The most significant concern is Sill structural corrosion (£1,500–£3,500 to address).
NC (2005–2015) — Engine options included the 1.8 MZR, 2.0 MZR. Our database flags 7 known issues on this generation, 1 of which are rated as safety-critical. The most significant concern is Suspension mounting point corrosion (£800–£2,000 to address).
ND (2015–2024) — Engine options included the 1.5 Skyactiv-G, 2.0 Skyactiv-G. We track 2 known issues on this generation, with 1 classified as significant. The most significant concern is Suspension joint and bush wear (£200–£600 to address).
The rear sills on NB MX-5s are prone to corrosion from the inside out, particularly where the hood frame drain channels allow water to collect. This affects the structural integrity of the passenger cell and is the most common MOT failure reason for this generation. The outer sill skin often appears solid while the inner structure is severely compromised. UK cars are particularly affected due to road salt and damp climate.
Severe sill corrosion compromises the structural rigidity of the passenger safety cell and will cause MOT failure. Professional sill replacement typically requires cutting out the entire rear section and welding in new metal. Cost varies dramatically depending on extent of damage but frequently exceeds the car's value on older examples.
Inspect the wheel arches, sills, jacking points and door bottoms carefully. Press gently on sills to check for soft spots. Look underneath for corrosion on structural components. Check the MOT history for corrosion-related advisories or failures.
The front and rear suspension mounting points are susceptible to corrosion that can weaken the attachment points to dangerous levels. This particularly affects the front upper wishbone mounts on the inner wing and rear suspension mounting points in the boot area. MOT data shows this model fails at 62.6 times the fleet average for mounting point corrosion, making it one of the most common failure modes.
Failed mounting points can allow suspension components to detach, causing immediate loss of vehicle control and potential serious accident. The car should not be driven if mounting point integrity is suspect. Repair requires cutting out corroded metal and welding in reinforcement plates.
Inspect the wheel arches, sills, jacking points and door bottoms carefully. Press gently on sills to check for soft spots. Look underneath for corrosion on structural components. Check the MOT history for corrosion-related advisories or failures.
The BP-ZE and BP-4W engines use an interference timing belt system where belt failure causes valve-to-piston contact and expensive internal damage. Mazda specifies 80,000 mile or 8-year intervals but the belt must be replaced regardless of condition within this timeframe. This is scheduled maintenance rather than a fault, but failure to service the belt results in catastrophic engine damage.
Belt failure destroys valves, pistons, and cylinder head requiring complete engine rebuild typically costing £3000-5000. The car cannot be driven after belt failure. Prevention through scheduled replacement is far more cost-effective than repair after failure.
Listen carefully for a rattle or ticking noise from the engine on cold start — this is the most common early sign. Ask for evidence of chain replacement in the service history. On higher-mileage cars without documented replacement, budget for preventative work.
MX-5 suspension bushes and joints wear at significantly higher rates than average due to the car's sporting suspension setup and enthusiast driving patterns. MOT data shows failure rates of 78.3 times the fleet average, with particular problems in upper and lower wishbone bushes, anti-roll bar links, and ball joints. The rear upper arm bushes are especially prone to splitting.
Worn bushes affect handling precision and can cause dangerous instability at higher speeds. Severely worn ball joints may separate causing loss of steering control. Most components can be replaced individually but alignment is essential after suspension work.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
Catalytic converter deterioration and lambda sensor failure cause emissions levels to exceed limits at MOT testing. This model shows 6-litre engines, particularly at higher mileages. The catalytic converter is expensive to replace and failure is often preceded by lambda sensor problems.
MOT failure due to excessive emissions levels. Continued driving with failed emissions equipment may damage other engine components and will fail the annual test. Catalytic converter replacement is expensive and essential for legal road use.
Check for any engine warning lights on the dashboard. Ask about the car's MOT emissions history — repeated failures suggest underlying issues. A pre-purchase diagnostic scan is especially worthwhile to check for stored emissions fault codes.
For the full breakdown of all 11 tracked issues with repair costs, see the Mazda MX-5 common problems page.
Based on 539k real DVSA MOT tests, the Mazda MX-5 fails more often than average on several items. The biggest outlier is subframe bushes or mounts worn at 165x the fleet average, followed by airbag fault (120x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Mazda MX-5 MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 13k miles) typically costs £80–£120 at an independent garage.
The bigger-ticket items to budget for include timing belt (£350–£500).
See the full Mazda MX-5 service schedule for every interval and cost breakdown.
The Mazda MX-5 has some well-documented weak points, including 2 safety-critical issues that demand careful checking. The right example, properly maintained, can still be a sound purchase — but cutting corners on the pre-purchase inspection is not advisable. 2019+ ND2 is the strongest choice with revised gearbox, no third-gear synchro issue and improved AC system. For the NC, 2009-2015 post-facelift cars fixed early gearbox faults. Mk1 NA 1.8 (1994-1998) is the classic pick but rust check is critical. Avoid 2016-2017 early ND1 cars which carry synchro and corrosion concerns.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Mazda MX-5, we cross-reference the exact variant, engine and age against our database of 11 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 11 known Mazda MX-5 issues. We are not affiliated with any source listed.