The P0303 code in your 2022 Subaru Forester indicates the engine control module has identified cylinder 3 as experiencing misfires beyond acceptable limits. This compact SUV uses the 2.5L naturally aspirated boxer four-cylinder producing 182 horsepower. Understanding Subaru's unique engine configuration ensures accurate diagnosis.
Cylinder 3 Configuration
Subaru's boxer engine positions cylinders horizontally opposed. Cylinder 3 is on the passenger side, toward the rear of the engine bay. This layout provides excellent balance and low center of gravity but affects service access patterns.
Fifth-Generation Forester
The 2022 model continues the fifth-generation Forester's proven combination of the 2.5L boxer engine and Lineartronic CVT transmission. This powertrain has been refined over many years.
Common P0303 Causes at Two to Three Years
At this relatively young age, most misfires stem from ignition component issues or fuel quality problems. Manufacturing variations cause early failure. Contaminated fuel affects combustion. Software updates may improve operation.
Boxer Engine Benefits
The horizontally opposed design provides smooth operation, excellent balance, and compatibility with Subaru's symmetrical all-wheel drive system.