Mini Cooper Error Code P0304: How to Fix It

Q: What causes P0304 cylinder 4 misfire in Mini Cooper?

Common causes include carbon buildup on intake valves (direct injection engines), faulty ignition coils, worn spark plugs, clogged fuel injectors, or internal engine problems like low compression.

Q: Can I drive my Mini Cooper with P0304 error code?

You should avoid driving with P0304 as it can damage the catalytic converter, cause poor fuel economy, and lead to more expensive repairs. Get it diagnosed and fixed promptly.

Q: How much does it cost to fix Mini Cooper P0304?

Repair costs vary: spark plugs ($20-60), ignition coils ($80-200), fuel injector cleaning ($100-300), or carbon cleaning ($300-800). Professional diagnosis typically costs $100-150.

Q: How often should Mini Cooper spark plugs be replaced?

Mini Cooper spark plugs should typically be replaced every 60,000-100,000 miles, but carbon buildup issues may require more frequent replacement every 30,000-40,000 miles.

Q: Will P0304 clear itself in Mini Cooper?

P0304 will not clear itself - the underlying cause must be fixed. The code may temporarily disappear after clearing but will return if the misfire condition persists.

Abstract

Mini Cooper error code P0304 indicates a misfire detected in cylinder 4, commonly caused by carbon buildup on direct injection engines. This error can cause rough idling, reduced power, poor fuel economy, and potential engine damage if left untreated.