The P0304 code in your 2020 Kia Sportage indicates the engine management system has detected persistent misfires in cylinder 4. As part of the fourth-generation Sportage, this model uses the proven 2.4L engine with well-established diagnostic procedures and service information.
Understanding P0304 in the 2020 Sportage
The 2020 Sportage features the 2.4L four-cylinder engine producing 181 horsepower through variable valve timing. This inline-four configuration positions cylinder 4 at the rearmost location near the firewall. Kia's engine management identifies cylinder 4 misfires through crankshaft velocity pattern analysis.
Age-Related Misfire Considerations
Vehicles from 2020 may be approaching or past standard maintenance intervals. Spark plug electrode wear occurs over normal operation. Ignition coils degrade from years of heat cycling. Direct injection engines accumulate carbon on intake valves. Consider the vehicle's mileage and maintenance history.
Diagnostic Approach
Review maintenance records if available. Retrieve all codes noting vehicle mileage context. Inspect spark plug condition—if original or maintenance unknown, replacement is advisable. Test ignition coil output. Verify fuel injector operation.
Repair Solutions
Replace spark plugs with Kia-specified components at proper torque. Test and replace degraded ignition coils. Address fuel system concerns. Consider comprehensive ignition service if maintenance history is incomplete.