The 2022 Lexus ES delivers luxury sedan refinement with efficient powertrain options. When your ES displays a P0304 code indicating a cylinder 4 misfire, understanding your engine configuration helps target accurate diagnosis.
Understanding P0304 in the ES
The 2022 ES is available with the 2.5L four-cylinder (ES250) or hybrid powertrain (ES300h). Cylinder 4 is located at the rear of the inline-4 engine, nearest the firewall in both configurations. The engine control module monitors combustion events with Toyota-derived precision.
Lexus Quality Standards
Lexus builds on Toyota's legendary reliability. The 2.5L engine family is known for durability and refined operation. When misfires occur, they typically indicate specific component issues rather than systemic problems.
Diagnostic Approach
Access the cylinder 4 ignition coil at the engine's rear. Inspect spark plug condition—Lexus uses iridium plugs with extended service life. Check for vacuum leaks in the intake system. Verify fuel injector operation if ignition components check out.
Resolution Process
Replace spark plugs with Lexus/Toyota specifications if worn. Test ignition coil output. The high quality of Lexus components means thorough diagnosis should precede parts replacement.