Mazda MX-5 (NA-NB) Factory Service Manual

Comprehensive guide for maintaining and repairing the Mazda MX-5 NA NB (1990-2005). Includes detailed instructions, error codes (OBD-II), and Electrical Wiring Diagrams (EWD). Perfect for enthusiasts and professionals, this manual covers engine specs, diagnostics, and step-by-step troubleshooting to keep your roadster in peak condition.

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Engine: BP, FP 1.8L 4-Cylinder

Transmission: N4A-HL, SB4A-EL

The Mazda MX-5 NB (1998–2005) is a reliable car, but with age certain problems may appear. Here is a list of typical faults and what to pay attention to when buying or servicing:

1. Engine

Oil leak:

Often from the valve cover or crankshaft seals.

Check oil level regularly.

Timing belt:

Requires replacement every 60,000 miles. Failure to replace can result in engine damage.

Throttle and sensors:

Problems with the throttle position sensor (TPS) can cause rough idle.

2. Cooling

Radiator:

Over the years, plastic radiator tanks can crack. It is recommended to replace them with an aluminum radiator.

Thermostat:

A sticking thermostat can cause the engine to overheat.

3. Corrosion

Wheel arches and sills:

Vulnerable areas due to moisture and dirt accumulation. It is especially important to check hidden areas.

Underbody:

Rust and damage can form under the underbody, especially if the car has been used in regions with heavy snow and salt.

4. Suspension

Silent blocks:

Over time, they wear out, causing noise and deterioration in handling. Replacing them with polyurethane ones can improve durability.

Shock absorbers:

Factory shock absorbers lose their effectiveness over time.

5. Transmission

Clutch:

Wears out by 120-150 thousand km, especially with an aggressive driving style.

Manual gearbox:

May become noisy at high mileage. Changing the gearbox oil can extend the service life.

Rear differential:

Sometimes there are oil leaks.

6. Electrics

Headlights:

Problems with headlight motors (especially on NA versions) were fixed in NB, but checking the electrics will not be superfluous.

Central locking and window lifters:

May wear out over time.

7. Roof

Fabric soft top:

Prone to wear, especially at the joints.

Water leakage through the seals is a common problem.

Folding mechanism:

Check for smooth operation and absence of jamming.

Pre-purchase recommendations

Check service history: Find out if timing belt, clutch and oil changes have been done on time.

Suspension and body diagnostics: Check for serious damage or corrosion.

OBD-II scan: Check for active or stored codes.