Mitsubishi Error Code P0304: How to Fix It

Q: Can I drive my Mitsubishi with a P0304 code?

You should avoid driving with a P0304 code as continued operation can damage the catalytic converter and cause more expensive repairs. If you must drive, keep speeds low and get it repaired as soon as possible.

Q: How much does it cost to fix a P0304 misfire?

Repair costs range from $100-150 for spark plugs, $150-400 for ignition coils, $300-600 for fuel injectors, or $1,500+ for internal engine problems like worn valves or piston rings.

Q: What causes cylinder 4 misfire in Mitsubishi vehicles?

Common causes include worn spark plugs, faulty ignition coils, clogged fuel injectors, low compression due to worn piston rings or valves, vacuum leaks, or carbon buildup in the combustion chamber.

Q: Will P0304 code clear itself?

The P0304 code may temporarily clear if the misfire stops, but it will return if the underlying problem isn't fixed. It's best to diagnose and repair the root cause rather than wait for it to clear.

Q: How do I know which cylinder is number 4?

Cylinder numbering varies by engine. For most Mitsubishi 4-cylinder engines, cylinder 4 is the rightmost cylinder when facing the engine. Check your owner's manual or engine cover for the specific cylinder layout.

Abstract

The P0304 error code on your Mitsubishi indicates that cylinder 4 is misfiring, which means the fuel-air mixture isn't burning properly in that cylinder. This can cause rough idling, poor acceleration, reduced fuel economy, and potential engine damage if left unaddressed.