The P0304 code in your 2022 Ford Maverick indicates the engine control module has detected persistent cylinder 4 misfires. As Ford's innovative compact pickup, the Maverick offers two powertrains—the P0304 code specifically applies to trucks equipped with the optional 2.0L EcoBoost turbocharged four-cylinder engine rather than the standard hybrid system.
Understanding P0304 in the 2022 Ford Maverick
The Maverick's optional 2.0L EcoBoost produces 250 horsepower through turbocharging and direct fuel injection. This inline-four positions cylinder 4 at the rearmost location near the firewall. The engine management system monitors crankshaft acceleration patterns to identify specific cylinder misfires, triggering P0304 when cylinder 4 shows consistent combustion problems.
EcoBoost Misfire Causes
Turbocharged direct injection engines face specific challenges. Higher cylinder pressures from boost increase ignition system demands. Spark plugs must fire reliably under elevated pressure, requiring quality components. Direct injection eliminates fuel washing of intake valves, allowing carbon buildup over time. The Maverick's compact truck mission may include towing and hauling that stress engine components further.
Diagnostic Approach
Begin by confirming the vehicle has the 2.0L EcoBoost engine rather than the hybrid powertrain. Retrieve all diagnostic codes and analyze freeze frame data. Access cylinder 4 components through the engine bay and inspect ignition system elements. Test spark plug condition, ignition coil output, and fuel injector operation systematically. Consider usage patterns that may affect component wear.
Repair Solutions
Replace spark plugs with Ford-specified iridium components designed for turbocharged applications. Maintain proper installation torque to protect cylinder head threads. Test and replace ignition coils showing degraded output. Address carbon accumulation through chemical or mechanical cleaning methods. Verify all electrical connections during reassembly.