Code P0302 on the 2024 Mazda CX-50 indicates a misfire has been detected specifically in cylinder 2. The CX-50's SKYACTIV-G engine requires all cylinders firing properly for smooth operation, and a cylinder 2 misfire affects performance, fuel economy, and emissions.
Misfire Detection Method
Mazda's ECM monitors crankshaft acceleration during each cylinder's power stroke. When cylinder 2 fails to produce its expected power contribution, the crankshaft hesitates, and this deceleration is detected. P0302 specifically identifies cylinder 2 as the source.
P0302 Symptoms
Expect rough idle, vibration, hesitation during acceleration, and reduced power. Fuel economy decreases as unburned fuel exits through the exhaust. If severe, the check engine light will flash, warning of potential catalytic converter damage.
Common Causes
Ignition system issues (worn spark plug, failing ignition coil) are most common. Fuel delivery problems (clogged or failing injector) prevent proper cylinder fueling. Compression issues (valve sealing, head gasket) affect cylinder's ability to combust properly. Vacuum leaks affecting cylinder 2 specifically can also cause misfires.
SKYACTIV Considerations
Mazda's SKYACTIV-G engine uses high compression ratios, making proper ignition system function critical. Spark plugs and coils must meet specification - generic parts may not perform adequately in these high-compression engines.