What are the most common problems with the Mazda MX-5?

The Mazda MX-5 is a lightweight, two-seater roadster. It has a reputation for a fun and sporty driving experience, sharp handling and a sleek design. With a bit of a cult following, it’s one of the best-selling sports cars in history, with no fewer than four generations since its debut in 1989.

However, like any vehicle, the Mazda MX-5 has had its share of common issues reported by drivers and owners, which we’ll run through in this blog. While new and used Mazda MX-5 parts, such as a replacement gearbox, engine, or other components, can help you cut costs, they can also be relatively pricey to maintain in comparison to newer vehicles, so we’ll also give you an idea of maintenance costs and reliability.

What are the common faults of the Mazda MX-5?

While not all Mazda MX-5 models will experience these issues, here are some of the most common problems reported by drivers and owners:

Rust and corrosion on sills, arches, floor and panel edging

Older Mazda MX-5 models often show rust around the edges of panels like the bonnets and boot lids. Corrosion can also occur underneath, particularly on suspension parts. As these cars age, key areas prone to rust include the rear sill hidden by a plastic panel, so watch for rust peeking out. Other rust-prone spots include the arches and the centre of the floor.

While it’s best to avoid cars with severe rust damage, affordable models with minor rust issues can be good projects if the price is right. Mk1 MX-5s often have rust at the rear sill area. Keeping the drain tubes from the roof storage area clear is crucial; water can overflow and damage the rear sill’s inner structure if blocked.

Coils and spark plug problems

A frequent issue seen in NC MX-5s is misfiring during idle or acceleration. This problem typically arises from the thin, delicate wiring linked to the ignition coils, which can deteriorate over time. Fortunately, this repair can often be handled by a professional mechanic or a car enthusiast. However, following up on this repair by replacing the coils and spark plugs to ensure optimal performance is wise. When evaluating the car’s price, make sure it takes these potential repair costs into account.

Dashboard warning light issues, especially DSC

Pay attention to any warning lights on the dashboard, especially the DSC (Dynamic Stability Control) light, which may stay on due to battery disconnection. While a low battery or a jump-start can trigger various warning lights, the DSC light can often be reset by turning the steering wheel from lock to lock unless there’s another underlying issue.

With warning lights now considered a failure during an MoT inspection, ensuring you can address any persistent lights is essential. An OBD2 code reader can help diagnose the problem and guide necessary repairs.

Hydraulic valve lifter noise

Some MX-5 owners have experienced loud ticking noises from the engine, mainly when it’s cold. This issue is often found in high-mileage models and is usually caused by sticking valve lash adjusters.

The typical solution is to replace the hydraulic valve lash adjusters, but to help prevent this problem, it’s also a good idea to stay on top of regular oil change schedules.

Problems with the convertible roof soft top

The soft top on convertible models can develop tears, leaks, or wear over time, particularly around the seams. Many owners have reported that the vinyl top deteriorates, even with infrequent use. There have also been complaints about the frame that supports the top, which can crack or tear over time, causing leaks, water damage and corrosion.

Suspension: anti-roll bar drop links

The Mazda MX-5 can experience some problems with its suspension and anti-roll bar drop links. One issue is that the suspension geometry may be incorrect, leading to a bumpy ride. Anti-roll bar drop links can also age and wear out, causing noise when driving, especially at low speeds.

While many suspension components are easy to replace, some can be costly. It’s important to check for broken coil springs and excessive corrosion on steel suspension arms to ensure safe and smooth handling. Regular maintenance can avoid these issues and keep the MX-5 performing well.

Problem with the brakes sticking – calliper issue

Mazda MX-5s that are poorly maintained or driven infrequently can have issues with sticking brake callipers. If the car pulls to one side when braking, it’s a sign that the callipers might be seizing. All generations of the MX-5 are known for this problem, so if you’re unsure, perform a few hard stops to see if the car stops straight. Look for any scoring on the brake discs and ensure the brake pads are wearing evenly.

Crankshaft issues

Mazda MX-5s, particularly older models and those with high mileage, can face crankshaft issues, commonly the failure of the crankshaft oil seal. A failing oil seal can lead to leaks, which reduce engine lubrication and can cause significant damage if not repaired. Not changing the oil regularly can also mean excessive wear on the crankshaft bearings, leading to knocking noises and decreased engine performance.

Gearbox

Mazda MX-5s can experience several gearbox issues, especially in older models. One common problem is difficulty shifting gears, often caused by worn or damaged synchromesh. This can lead to grinding noises when changing gears and make it hard to engage the right gear, particularly when shifting down a gear.

Another issue is the potential for a leaky gearbox, which can result from worn seals or gaskets. Low transmission fluid levels can lead to overheating and increased wear on internal components.

Ensuring you check fluid levels and change transmission fluid regularly can help prevent problems and extend the life of your gearbox.

Is the Mazda MX-5 reliable?

The reliability of the MX-5 can vary depending on the generation, model year and how well previous owners have maintained it. However, WhatCar considers the MK-5 a generally reliable car, awarding it ninth out of 13 cars in the coupe, convertible and sports car class in 2024. Mazda is ranked 18th most reliable used car brand out of 34 manufacturers.

Is the MX-5 expensive to run?

The Mazda MX-5 is generally considered an affordable sports car, but some owners find costs can add up, mainly due to high CO2 emissions and road tax. You’ll also need routine servicing to keep your MX-5 in good condition, with full-service costs at around £260 for larger engines.

Other maintenance expenses include oil changes and various component replacements, such as air filters, spark plugs and coolant flushes. Regular brake fluid replacements are also recommended every 24,000 miles or every two years to ensure optimal performance and safety. Sticking to your recommended service schedule can prevent minor issues from becoming major ones and reduce any costly repairs, such as a replacement engine.

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