When your 2022 Nissan Altima displays the P0304 code, the powertrain control module has identified recurring misfires in cylinder 4. Understanding the Altima's engine options enables targeted diagnosis for this specific combustion problem affecting your sedan's performance.
Understanding P0304 in the 2022 Altima
The 2022 Altima features either the 2.5L four-cylinder or the advanced 2.0L VC-Turbo engine. Both inline-four engines position cylinder 4 at the rear, closest to the firewall. Nissan's engine management monitors crankshaft velocity patterns to identify the specific cylinder experiencing combustion irregularities.
Common Misfire Causes
The 2.5L faces standard ignition system wear including spark plug electrode erosion and ignition coil degradation. The VC-Turbo adds turbo-related ignition demands and variable compression complexity. Both engines use direct injection technology that can contribute to intake valve carbon accumulation over time.
Systematic Diagnosis
Confirm your engine type, then retrieve all codes and freeze frame data. Access the rear cylinder bank for cylinder 4 inspection. Test spark plug condition and ignition coil output. Verify fuel injector operation. Consider carbon accumulation for higher-mileage vehicles regardless of engine variant.
Effective Repairs
Replace spark plugs with Nissan-approved components for your specific engine. Install new ignition coils if testing reveals inadequate output. Address fuel system concerns through cleaning or component replacement. Professional carbon cleaning may benefit higher-mileage direct injection engines.