The 2022 Volvo XC90 delivers luxury three-row SUV excellence with Volvo's versatile 2.0L four-cylinder platform. When your XC90 displays a P0304 code indicating a cylinder 4 misfire, understanding your specific configuration helps guide accurate diagnosis.
Understanding P0304 in the XC90
The XC90 uses Volvo's 2.0L four-cylinder in various configurations: T5 (turbo), T6 (turbo + supercharger), or T8 (hybrid). Cylinder 4 is at the rear of the inline-4 engine, nearest the firewall. The engine control module monitors combustion events with precision.
Forced Induction Considerations
All XC90 configurations use forced induction, creating higher combustion pressures than naturally aspirated engines. The T6 combines turbocharging with supercharging for immediate response. T8 adds plug-in hybrid capability. All configurations stress ignition components.
Diagnostic Approach
Identify your configuration and access the cylinder 4 ignition coil at the engine's rear. Inspect spark plug condition. Check for boost leaks. On T8, verify hybrid system isn't masking combustion issues.
Resolution Process
Replace spark plugs with Volvo specifications. Test ignition coil output. Address any boost system leaks. If carbon buildup is suspected, intake valve cleaning may be warranted.