RIDEX Petrol Fuel Injector Nozzle • 3902I0222

RIDEX 3902I0222 Petrol Fuel Injector Nozzle

Replacement RIDEX petrol fuel injector for Mazda MX-5 Mk3/NC 2.0-litre petrol models, plus selected Mazda 3, Mazda 5 and Mazda 6 petrol applications listed in the compatibility table.

The fuel injector is an electrically controlled valve that meters and atomises petrol into the engine’s intake port. The engine control unit operates the injector in precisely timed pulses to maintain the required air-to-fuel mixture during starting, idling, acceleration and normal driving.

The injector is fitted between the engine’s fuel rail and intake manifold or cylinder-head intake port. One injector is required per cylinder and one individual injector is supplied. A four-cylinder engine uses four injectors in total.

Common symptoms of a failing, restricted or leaking injector include difficult starting, uneven idle, hesitation, reduced performance, misfire fault codes, increased fuel consumption, excessive emissions or a strong fuel smell. Electrical failure, internal contamination, poor spray pattern and damaged injector seals can all require replacement.

• Part type: Petrol fuel injector nozzle
• Primary use: Meters and atomises petrol into the engine intake port
• Location: Fuel rail and intake-manifold / cylinder-head intake port
• Fuel-mixture formation: Petrol injection
• Operating mode: Electric
• Electrical resistance: 12 Ω
• Approximate weight: 0.042 kg
• EAN: 4064138121750
• Quantity per vehicle: 4 on the listed four-cylinder applications
• Quantity supplied: 1 individual injector
• Brand: RIDEX
• Part No.: 3902I0222
• Designed as an aftermarket replacement for the applications listed in the compatibility table

Fitment advice: For the Mazda MX-5, this injector is confirmed for Mk3/NC 2.0-litre petrol models using the L3G5-13-250 injector reference family. The MX-5 1.8-litre application is not included. Wider Mazda fitment varies according to engine and the injector originally installed. For imported, modified or previously repaired cars, matching the part number, connector and injector body style on the component being replaced is recommended.

Other items to consider: When changing this part, you may also want to consider purchasing injector upper and lower seals, fuel-rail seals, retaining clips, intake-manifold gaskets, fuel-system cleaner or the remaining injectors where testing identifies uneven flow across the set.

Useful tools / consumables: Socket and spanner set, fuel-line disconnection tools where applicable, torque wrench, electrical-connector tools, fuel-pressure test equipment, injector test or cleaning equipment, clean engine oil for lubricating compatible seals, workshop towels and suitable eye and hand protection.

Difficulty guide: DIY Difficulty: Moderate to Advanced. The fuel system must be depressurised before dismantling, and care is required to prevent dirt entering the fuel rail or intake ports. Injector seals must be installed without cutting, twisting or trapping them.

Why RIDEX? RIDEX parts are aftermarket replacement components designed to provide a cost-effective repair option for everyday vehicle maintenance and refurbishment. They are intended to replace the original component on the applications listed, helping restore function while keeping repair costs sensible.

What’s in the box: One RIDEX petrol fuel injector nozzle. The exact supply of separate O-rings, seals or retaining clips should be confirmed from the physical package before installation.

Installation notes: Work only with the engine cold and depressurise the fuel system before disconnecting any fuel pipe or rail component. Disconnect the battery, clean the surrounding area and remove the fuel rail according to the vehicle layout. Prevent dirt from entering the fuel rail and intake ports. Remove the old injector and inspect the rail, retaining clips and electrical connector for damage. Fit new compatible seals where required and lubricate them lightly with a suitable clean lubricant before assembly. Install the injector squarely without twisting or cutting the seals. Refit the rail and fuel connections, tighten all fixings to the applicable vehicle specifications and reconnect the electrical plugs. Prime the fuel system and inspect carefully for leaks before starting the engine. After starting, check again for leakage, stable idle and stored fault codes.