The 2024 Mazda CX-90 represents Mazda's flagship three-row SUV, featuring either the new Skyactiv-G 3.3 Turbo inline-6 or the 2.5L plug-in hybrid powertrain. When your CX-90 displays a P0304 code indicating a cylinder 4 misfire, understanding your specific powertrain configuration is essential for accurate diagnosis.
Understanding P0304 in the CX-90
For CX-90 models equipped with the inline-6 engine, cylinder 4 is positioned in the middle of the engine. For PHEV models with the 2.5L four-cylinder, cylinder 4 is at the rear. The engine control module monitors combustion events through crankshaft position analysis to detect misfires in either configuration.
New Engine Technology
The Skyactiv-G 3.3 Turbo inline-6 represents Mazda's new premium engine architecture with features not seen in previous models. This first-generation engine may have specific characteristics requiring attention to technical service bulletins. The PHEV's 2.5L shares technology with proven Skyactiv designs but adds hybrid system complexity.
Diagnostic Approach
First, identify your powertrain configuration as cylinder location and access differ between inline-6 and PHEV models. On inline-6 variants, cylinder 4 access may be limited in the engine bay. Inspect ignition coil and spark plug condition appropriate to your engine type. Check for any recall notices or service bulletins.
Resolution Path
As a 2024 model, your CX-90 should be under warranty. Component failures causing misfires are typically covered. Have your Mazda dealer diagnose the issue using their specialized diagnostic equipment and access to current technical information specific to this new platform.