Mitsubishi P0303 Error Code: How to Fix It

Q: Can I drive with a P0303 code?

You should avoid driving with a P0303 code as continued operation can damage the catalytic converter and cause more expensive repairs. If you must drive, keep speeds low and get to a repair facility immediately.

Q: What causes a cylinder 3 misfire in Mitsubishi vehicles?

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

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

Repair costs vary from $50-150 for spark plugs to $200-400 for ignition coils or fuel injectors. More serious issues like low compression can cost $1000-3000+ depending on the required repairs.

Q: Will a P0303 code clear itself?

The P0303 code will not clear itself until the underlying misfire condition is repaired. The code may disappear temporarily but will return if the problem persists.

Q: Can bad gas cause a P0303 misfire code?

Yes, contaminated or low-quality fuel can cause misfires. Try adding a fuel system cleaner or using higher octane fuel, but if the problem persists, mechanical issues are more likely the cause.

Abstract

The P0303 error code indicates that your Mitsubishi's engine control module has detected a misfire in cylinder 3. This means the fuel and air mixture in cylinder 3 is not burning properly, which can cause rough idling, reduced power, and potential engine damage if left untreated.