Subaru Engine Error Code P0306: How to Fix It

Q: What causes Subaru P0306 cylinder 6 misfire?

Common causes include worn spark plugs, faulty ignition coil packs, clogged fuel injectors, vacuum leaks, low compression from worn engine components, or carbon buildup on intake valves.

Q: Can I drive my Subaru with P0306 error code?

Driving with a misfire is not recommended as it can damage the catalytic converter and worsen engine problems. If you must drive, keep speeds low and get to a repair shop immediately.

Q: How much does it cost to fix Subaru P0306?

Costs vary widely: spark plugs ($50-100), ignition coil ($100-200), fuel injector ($150-300), or major engine repairs ($1000+). Diagnosis typically costs $100-150 at a shop.

Q: Is P0306 specific to Subaru H6 engines?

P0306 indicates cylinder 6 misfire on any 6+ cylinder engine. However, Subaru H6 engines have cylinder 6 on the passenger side of the horizontally-opposed engine configuration.

Q: How do I prevent future P0306 codes?

Regular maintenance including spark plug replacement every 60,000-100,000 miles, using quality fuel with injector cleaner, and addressing check engine lights promptly helps prevent misfires.

Abstract

Subaru error code P0306 indicates a misfire in cylinder 6 of your H6 engine. This serious issue causes rough idle, reduced power, and potential engine damage if left untreated. Quick diagnosis and repair prevents costly damage to your catalytic converter and engine components.