GENUINE MAZDA OEM Ignition Coils Complete Set (N3H1-18-100C x 4) for Mazda RX8 (Series 1 & 2, 2003-2012)

Part details

This RX8 ignition coil set delivers a complete four-coil genuine Mazda replacement for the Renesis rotary engine, covering every Series 1 and Series 2 car from 2003 to 2012. Worn coils are one of the most common causes of hard starts, rough idling and misfires on higher-mileage RX8s. Replacing all four at once with matched N3H1-18-100C units eliminates the guesswork of mixed-condition or unknown-history coils. Crucially, these are the latest-revision genuine Mazda coils, sharing the same specification fitted to GT, R3 and Spirit R models from the factory. RX8 Ignition Coil Set Features Four coils supplied as a single pack, covering every ignition position in one service. No position is left with an aged unit. Each coil carries the N3H1-18-100C specification , Mazda's genuine part number for Series 1 and Series 2 RX8 applications. OEM manufacturing standards deliver the correct firing voltage and coil saturation timing. The Renesis ECU is calibrated to expect exactly these values, not an aftermarket approximation. Fitted from the factory to the GT, R3 and Spirit R variants, these units represent Mazda's own final-revision improvement over earlier coil production. Finally, replacing all four simultaneously removes the uneven spark energy that develops when a single new coil is mixed with aged ones. The ignition system gets a consistent baseline from the first start. For RX8 enthusiasts dealing with cold-start hesitation or a rough idle that clears once the engine warms up, a fresh RX8 ignition coil set is often the most direct fix. Owners who replace coils one at a time frequently find the improvement short-lived. The remaining aged units continue to degrade and reintroduce the same symptoms. A matched set of genuine Mazda coils removes that variable entirely. The confidence of running a known-condition ignition system is noticeable from the first key turn. A healthy ignition system works best alongside accurate air metering and reliable fuel delivery. Pair this service with the GENUINE MAZDA OEM MAF Sensor if diagnostics point to a metering fault, or add the GENUINE MAZDA OEM Fuel Pump for a broader genuine-parts refresh of the engine's core systems. For official Mazda ownership and service information, visit Mazda Australia .

Listed fitment

Model

Series 1 (2003-2008)

Model

Series 2 (2009-2012)

Part information

SKU

OM-COP-S1S2

Brand

GENUINE MAZDA OEM

Does this set fit both Series 1 and Series 2 RX8 models?

Yes, this genuine Mazda ignition coil set fits every RX8 built from 2003 to 2012, covering both Series 1 (2003-2008) and Series 2 (2009-2012) variants. All four coils carry the N3H1-18-100C specification, which is the correct genuine Mazda reference for both series.

Why should I replace all four coils at once rather than just the faulty one?

Replacing only one coil leaves the remaining units of mixed age and unknown condition, which can produce uneven spark energy across the Renesis engine. Fitting a matched set of four eliminates that inconsistency and gives the ignition system a uniform baseline from the first start.

What symptoms typically indicate the ignition coils need replacing on an RX8?

Common signs of worn or failing RX8 ignition coils include hard starts, rough idling, misfires and a general lack of smoothness at lower revs. High-mileage RX8s are particularly prone to these issues as coil output degrades gradually over time.

Are these genuine Mazda coils or aftermarket replacements?

These are genuine Mazda OEM coils, not aftermarket alternatives. Each unit is manufactured to OEM standards, ensuring the correct firing voltage and coil saturation time that the Renesis ECU is calibrated to expect.

What is the part number for these ignition coils?

Each coil in this set carries the genuine Mazda part number N3H1-18-100C, which is the correct specification for RX8 Series 1 and Series 2 applications across the full 2003 to 2012 production run.

How difficult is it to replace the ignition coils on an RX8?

Swapping ignition coils on the Renesis engine is a straightforward service task within reach of a competent home mechanic, though owners unfamiliar with rotary engines may prefer to have the work done by a specialist. Replacing all four at once means the job only needs to be done once rather than revisited coil by coil.

Will genuine Mazda coils work correctly with an aftermarket tune or modified ECU?

Genuine Mazda coils are calibrated to the factory ECU's expected coil saturation time and firing voltage, so they are the correct baseline for a standard or mildly modified RX8. Owners running significant power modifications or an aftermarket coil pack setup should confirm coil compatibility with their tuner.

Can I pair these coils with other genuine Mazda parts during the same service?

Yes, combining this ignition coil set with the genuine Mazda OEM MAF Sensor or genuine Mazda OEM Fuel Pump during the same service is a practical way to refresh multiple core systems at once, particularly on higher-mileage cars where several components may be showing their age simultaneously.