2018 Hyundai Sonata
Mileage
84,234
Service Date
9/4/2025
Services Performed
- Tech verified check engine light is on. Scan computer to find code P0304 (Misfire Cylinder #4). Monitor data to verify misfire at cylinder #4. Check circuit to coil & seems ok at this time. Switch #4 spark plug & ignition coil to other cylinders to see what path misfire follows. It followed path of spark plugs. Checked compression at cylinders #3 & #4 & seems ok at this time. Recommend replace spark plugs first. Then recheck system. Advised customer of our findings.
- SPARK PLUGS – Remove & Replace – All
- Checked oil level & is overfilled at this time. Verified no current oil leaks at this time. Did notice oil wetness at valve cover gasket but not dripping oil. This engine is known for consuming oil & should check oil level more often. Advised customer of our findings.
- We have diagnosed and repaired your "Check Engine Light" or "Service Engine Soon Light". Be advised that more than twenty (20) conditions can trigger this light. The symptoms may be very similar as the original complaint but may be caused by a different component. There will be an additional charge for diagnosis if the light is triggered by any component not covered under this repair.
Nicholas R. gave our service a 5 star review on 9/5/2025
