A P0303 diagnostic trouble code on your 2024 Mazda CX-90 indicates the powertrain control module has detected a cylinder 3 misfire. The all-new CX-90 introduces Mazda's innovative Skyactiv-G 3.3L turbocharged inline-6 engine, requiring updated diagnostic approaches.
CX-90 Powertrain Options
The 2024 CX-90 offers multiple powertrains including the new 3.3L turbo inline-6 and a plug-in hybrid variant. On the inline-6 engine, cylinder 3 is positioned in the front half of the engine. Understanding which powertrain your vehicle has is essential for proper diagnosis.
Common Causes
- Ignition Coil Issues: The new inline-6 uses individual coil packs that can fail
- Spark Plug Problems: High-performance turbo engines require specific spark plugs
- Fuel Injector Concerns: Direct injection system deposits or failures
- Boost System Leaks: Turbocharged engines are sensitive to intake leaks
- Software Issues: First model year may have ECU calibration updates
Diagnostic Methodology
Use Mazda's latest diagnostic software to access engine data. Check for any technical service bulletins related to misfires on this new powertrain. Monitor misfire counts and fuel trim data. Test ignition components systematically. Verify software version and updates.
Repair Approach
For the new CX-90, dealer diagnosis is recommended to ensure access to the latest service information. Replace confirmed faulty ignition components with OEM parts. Check for ECU updates that may address drivability concerns. Document all findings for warranty coverage.