When your 2022 Ford Explorer displays the P0305 code, the powertrain control module has detected repeated misfires in cylinder 5. The 2022 Explorer is available with both four-cylinder and V6 engine options. P0305 is a legitimate code if your Explorer has the 3.0L EcoBoost V6 or the 3.3L hybrid V6, but would be anomalous on the 2.3L EcoBoost four-cylinder model.
2022 Explorer Engine Options
The sixth-generation 2022 Explorer offers the 2.3L EcoBoost I-4 (300 hp), 3.0L EcoBoost V6 (standard 400 hp, or tuned versions), 3.3L V6 hybrid, and the rear-wheel drive 3.3L naturally aspirated V6 on base models. Only V6 configurations have a cylinder 5.
Cylinder 5 Location
On Explorer V6 engines, cylinder 5 is positioned on the passenger side bank toward the rear of the engine bay. Ford's firing order places cylinder 5 in the sequence where it shares exhaust and intake events with specific cylinders, which can help identify related issues.
Common Causes of P0305
Spark plug wear is the primary cause, especially approaching 60,000-mile service intervals. Ignition coil failure is common on turbocharged engines due to increased cylinder pressure and heat. On 3.0L EcoBoost engines, direct injection carbon buildup can affect airflow into cylinders over time. Vacuum leaks near the intake manifold can cause lean conditions at individual cylinders.
Diagnostic Procedure
First verify your engine type to confirm P0305 is applicable. Access cylinder 5's spark plug for inspection. Test the ignition coil through resistance measurement and swap testing. Check for vacuum leaks using smoke testing. On higher-mileage EcoBoost V6 engines, intake valve inspection may be warranted.