The 2024 Mazda CX-5 features the refined Skyactiv-G engine series known for its high compression ratio and excellent efficiency. When your CX-5 displays a P0304 code indicating a cylinder 4 misfire, addressing it promptly preserves the engine's smooth operation and fuel economy advantages.
Understanding P0304 in the CX-5
Mazda's Skyactiv-G engines operate with unusually high compression ratios for gasoline engines, demanding precise ignition timing and quality fuel. Cylinder 4 is located at the rear of the inline-4 engine, nearest the firewall. The engine control module monitors crankshaft acceleration to detect misfires with high accuracy.
Skyactiv Engine Considerations
The high compression ratio design makes Skyactiv engines particularly sensitive to ignition system condition. Spark plugs that might function acceptably in conventional engines can cause misfires in these high-compression applications. Fuel quality also plays a larger role—contaminated or low-octane fuel can trigger misfires more readily.
Diagnostic Steps
Access the cylinder 4 ignition coil at the rear of the engine. Mazda uses individual coil-on-plug assemblies that can be tested by swapping to an adjacent cylinder. Inspect the spark plug carefully—the high compression environment accelerates electrode wear. Check for vacuum leaks that could cause lean conditions affecting cylinder 4.
Resolution Approach
Replace spark plugs with Mazda-specified components designed for high-compression operation. Standard replacement intervals may need to be shortened if you frequently drive in conditions that stress the ignition system. Verify ignition coil output meets specifications and replace if degraded.