Subaru Error Code P0303: How to Fix It

Q: What causes Subaru P0303 cylinder 3 misfire?

Common causes include worn spark plugs, faulty ignition coils, damaged spark plug wires, clogged fuel injectors, low compression due to valve problems, or vacuum leaks affecting cylinder 3 specifically.

Q: Can I drive my Subaru with P0303 error code?

You should avoid driving with a P0303 code as misfires can damage the catalytic converter and cause poor performance. If you must drive, do so gently and get it repaired as soon as possible.

Q: How much does it cost to fix P0303 on a Subaru?

Repair costs vary widely depending on the cause. Simple fixes like spark plugs cost $100-200, ignition coils range $150-300, while internal engine problems can cost $1000-3000 or more.

Q: Will P0303 clear itself?

P0303 will not clear itself as it indicates an active misfire condition. The underlying problem must be fixed, then the code can be cleared with an OBD2 scanner or by disconnecting the battery.

Q: What are symptoms of cylinder 3 misfire in Subaru?

Symptoms include rough idle, engine hesitation during acceleration, reduced fuel economy, check engine light, and possible catalytic converter damage if left untreated for extended periods.

Abstract

Subaru error code P0303 indicates a misfire detected in cylinder 3 of your engine. This code triggers when the engine control module detects incomplete combustion in the third cylinder, which can cause rough idling, reduced power, and potential engine damage if not addressed promptly.