The P0302 diagnostic code on your 2023 Mazda CX-9 indicates cylinder 2 is experiencing misfires detected by the engine control module. Note that 2023 was the final year for the CX-9, replaced by the CX-90. The CX-9 is powered by the Skyactiv-G 2.5T turbocharged four-cylinder.
Final Year CX-9
The 2023 CX-9 represents the model's final iteration before being replaced by the CX-90. The proven 2.5T turbo produces up to 250 horsepower with well-documented characteristics. Cylinder 2 is second from the timing end.
Turbo Engine Specifics
The turbocharged engine provides excellent performance for three-row duty. Direct injection delivers efficient fuel management. Turbo heat and boost pressures create specific maintenance needs. The engine is well-established with known diagnostic procedures.
Common Misfire Causes
Ignition coil degradation from turbo environment is common. Spark plug wear accelerates under boost. Direct injection carbon buildup develops over time. Boost irregularities affect combustion.
Symptom Recognition
The three-row SUV displays rough idle, vibration, and hesitation with misfires. The refined character suffers. Check engine light accompanies the condition.
Diagnostic and Repair Approach
Scan for all codes including boost codes. Inspect ignition components. Verify boost system. Test fuel delivery. Given the newer model year, warranty coverage should apply.