Lexus Engine Error Code P0304: How to Fix It

Q: Can I drive my Lexus with a P0304 error code?

You should avoid driving with a P0304 code as it can cause catalytic converter damage, poor fuel economy, and engine damage. If you must drive, keep speeds low and get it diagnosed immediately.

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

Repair costs range from $50-100 for a spark plug replacement to $200-500 for ignition coils or fuel injectors. More serious internal engine problems can cost $1000+ to repair.

Q: What causes cylinder 4 to misfire in a Lexus?

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

Q: Will a P0304 code clear itself?

No, P0304 codes typically don't clear themselves. The underlying problem must be fixed, then the code cleared with an OBD2 scanner or by disconnecting the battery briefly.

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

Cylinder numbering varies by engine type. Check your owner's manual or look for cylinder numbering on the intake manifold. Generally, cylinders are numbered from front to back on inline engines, or in specific patterns on V-engines.

Abstract

Error code P0304 in your Lexus indicates a misfire in cylinder 4, meaning the engine is not firing properly in that cylinder. This can cause rough idle, poor acceleration, reduced fuel economy, and potential engine damage if left unaddressed.