A P0302 code on your 2022 Mazda Mazda3 indicates the engine control module has detected misfires in cylinder 2. The fourth-generation Mazda3 offers the Skyactiv-G 2.5L naturally aspirated or Skyactiv-G 2.5T turbocharged four-cylinder. Each engine has specific diagnostic considerations for misfire resolution.
Skyactiv Engine Technology
The 2.5L uses a 13:1 compression ratio with direct injection for efficiency. The turbo delivers up to 250 horsepower with more conventional compression. Both are inline-4 with cylinder 2 second from the timing end.
Common Misfire Causes
Direct injection carbon buildup can develop on intake valves. The high-compression naturally aspirated engine is particularly sensitive to deposits. Ignition coil and spark plug issues are primary causes. Turbo models add boost system variables.
Symptom Recognition
The compact car displays rough idle, vibration, and hesitation with misfires. Mazda's refined driving character suffers. Check engine light accompanies the condition.
Diagnostic and Repair Approach
Identify engine type. Scan for all codes. Inspect ignition components on cylinder 2. Test fuel system. Verify boost on turbo models. Given the newer model year, warranty coverage should apply.