Used Mazda RX-8 Fuel Injector

This is an important question: the RX-8 uses a rotary Wankel engine (the Renesis 13B-MSP), and while rotary engines do not have conventional piston-cylinder combustion, they are petrol engines that do use fuel injectors to deliver fuel into the rotor housing. The RX-8 has both primary and secondary injectors as part of its sequential injection system, so injectors are a genuine part on this car. However, because the engine design is unique, the injectors are specific to this rotary application and are not interchangeable with injectors from conventional piston-engined cars.

The RX-8 was produced in two generations: Series 1 (2003–2008) and Series 2 (2008–2012), with the Series 2 bringing revisions to the Renesis 13B-MSP engine alongside other changes. A 2004 and a 2007 car are both Series 1, so in principle the injectors should be compatible, but confirm the engine code on both vehicles with the breaker against your registration before buying, as mid-production running changes to ancillary components can affect fitment.

The Series 2 RX-8 introduced a revised version of the Renesis 13B-MSP engine with changes aimed at improving emissions and reliability, which may have affected the injector specification. Because this is a generation boundary, you should not assume the injectors cross-fit without checking — supply your registration and the donor car's registration to the breaker so they can confirm compatibility before purchasing.

The RX-8 was offered in power outputs of 192 PS and 231 PS, and unlike trim differences on conventional cars, this distinction is mechanically significant because the two outputs used different engine configurations — the 231 PS version used a six-port intake and higher-revving tune. The injector specification may therefore differ between the 192 PS and 231 PS variants, so always confirm the exact engine code from your V5 or a VIN check and supply it to the breaker rather than relying on the badge or trim name alone.

Whether injectors are coded or paired to the RX-8's ECU or immobiliser system is something you should confirm with the breaker against your specific registration, as this is not something we can state as fact for all variants. It is worth raising this with a Mazda specialist or the selling breaker before purchase, so you are not caught out by a part that requires additional programming to function correctly.

The single most useful thing you can supply to the breaker is the engine code, which you can find on your V5 logbook or by running a VIN check — this matters far more than the year or badge alone for a mechanically specific part like this. Also confirm whether your car is the 192 PS or 231 PS variant, and note whether it is a Series 1 (2003–2008) or Series 2 (2008–2012) car. A good breaker will cross-reference the donor car's details against yours before supplying the part.