The 2022 Lexus RX delivers luxury crossover refinement with proven Toyota-derived powertrains. When your RX displays a P0304 code indicating a cylinder 4 misfire, understanding your engine configuration helps guide accurate diagnosis.
Understanding P0304 in the RX
The 2022 RX is available with the 3.5L V6 (RX350) or hybrid powertrain (RX450h). In the V6, cylinder 4 is on the rear of the left bank. Both configurations use Toyota's proven engine architecture known for reliability. The engine control module monitors combustion events with precision.
Lexus Quality Standards
Lexus vehicles are built to exacting standards, making misfires uncommon. When they occur, systematic diagnosis typically reveals specific component failures rather than design issues. The Toyota 3.5L V6 has an excellent reliability track record.
Diagnostic Approach
Access the cylinder 4 ignition coil on the left bank. Inspect spark plug condition—Lexus typically uses iridium plugs with long service life. Check for vacuum leaks in the intake system. Verify fuel injector operation.
Resolution Process
Replace spark plugs with Lexus/Toyota specifications if worn. Test ignition coil output. Lexus's high-quality components rarely fail prematurely, so thorough diagnosis is important before replacement.