The 2018 Toyota Camry marked the introduction of the TNGA platform with an available 3.5L V6 engine featuring D-4S dual injection. When P0306: Cylinder 6 Misfire Detected appears, your Camry has identified that cylinder 6 isn't contributing properly to engine output.
Understanding the 2018 Camry V6
The 2018 Camry V6 uses Toyota's 2GR-FKS engine producing 301 horsepower. Cylinder 6 occupies a position on the rear bank, where reduced airflow creates higher operating temperatures for ignition components. The D-4S system helps mitigate carbon buildup through port injection supplementing direct injection.
Typical Causes of P0306
After several years and accumulated mileage, ignition coils develop internal resistance issues from heat cycling. Spark plugs nearing 100,000-mile service intervals produce degraded spark quality. Even with D-4S, some carbon accumulation occurs over time. Fuel injector flow rates may decrease from deposits or wear. Age-related vacuum leaks develop in intake system seals and gaskets.
Diagnostic Protocol
Retrieve all stored codes and freeze frame data for diagnostic context. Inspect the cylinder 6 ignition coil—at this vehicle age, heat damage is a primary concern. Remove the spark plug and assess wear patterns against specifications. Check fuel injector operation for both the direct and port injectors. Perform compression testing to evaluate any wear-related sealing issues. Test for vacuum leaks that may have developed over time.
Age-Appropriate Service Considerations
With a 2018 Camry potentially having significant mileage, consider replacing all rear-bank ignition components preventively. Quality replacement parts ensure reliable operation for continued years of service.