Mazda · Known Issues
1998 Mazda MX-5 Miata Problems: 7 Known Issues
1998 model year · 8,800+ owner reports · Updated September 2026
1998 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
1998 model year · 8,800+ owner reports · Updated September 2026
1998 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 8,800+ owner reports, the 1998 Mazda MX-5 Miata has 7 documented known issues, with 1 rated critical. The most serious is Rocker panel and front frame-rail rust (rear of rockers / behind front wheels) ($500-$4,000 repair). The most commonly reported issue is Soft Top Wear and Rear Window Delamination with 5,000 owner reports. Across all issues with published estimates, repair costs range from $80 to $4,000. DIY maintenance guides at au7o.io.
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According to Au7o's analysis of 8,800+ owner reports, the 1998 Mazda MX-5 Miata has 7 documented issues. The most frequently reported are: Rocker panel and front frame-rail rust (rear of rockers / behind front wheels), Soft Top Wear and Rear Window Delamination, Rear Main Seal Oil Leak. Of these, 1 is rated critical and should be addressed promptly.
The 1998 Mazda MX-5 Miata has 7 known issues documented across 8,800+ owner reports. 1 issue is rated critical: Rocker panel and front frame-rail rust (rear of rockers / behind front wheels). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Mazda MX-5 Miata issues range from $80 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Rocker panel and front frame-rail rust (rear of rockers / behind front wheels), typically costs $500-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
NA and NB Miatas are prone to structural rust in two well-known areas: the rear ends of the rocker panels (sills) and the front frame rails behind the front wheels. Road water enters through wheel-arch pinch welds and body seams and collects inside the double-layer sheet metal, r… Repairs typically run $500-$4,000. Severity: high.
Miata soft tops deteriorate over time from UV exposure, flexing during operation, and age. Vinyl tops develop cracks and tears, cloth tops fade and shrink. The rear plastic window (NA/NB) or glass window (NC/ND) can delaminate from the top material, causing water leaks and reduce… Repairs typically run $300-$1,500. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
All generations of Miata (NA through NC) are prone to rear main seal leaks as the engine ages. Oil seeps from the crankshaft rear seal, dripping onto the clutch housing and eventually contaminating the clutch disc. High mileage engines and infrequent oil changes accelerate seal d… Repairs typically run $400-$1,200. Severity: medium.
Both the 1.6L B6 and 1.8L BP are belt-driven and Mazda specifies timing-belt replacement at 60,000 miles. On 25-35 year-old cars, belts frequently fail on age/dry-rot rather than mileage. The engines are non-interference, so a snapped belt will not bend valves, but it will strand… Repairs typically run $350-$900. Severity: medium.
The 1994-2000 1.8L BP engines use a wasted-spark coil pack with an integrated igniter transistor. The early version (identified by the 4-pin input connector, later revised to 3-pin) is notorious for internal igniter/solder-joint failure, especially if the ignition is left in the… Repairs typically run $90-$350. Severity: medium.
NA and most early NB tops use a flexible plastic (vinyl) rear window, on many NA tops joined to the top with a zipper so the window can be lowered. With UV exposure and age the plastic yellows, hazes to near-opaque, and cracks (often starting at corners or the zipper seam); the z… Repairs typically run $100-$700. Severity: low.
On 1.8L BP engines, the Cam Angle Sensor (commonly called the CAS) mounts at the rear of the cylinder head, engaging the camshaft, and is sealed to the head by a single rubber O-ring. With age and heat cycling the O-ring hardens and shrinks, letting oil weep out of the back of th… Repairs typically run $80-$300. Severity: low.