Thu, 16 Apr 2026 21:45:16 +0000

Fix It Fast! The Secret to Eliminating P0304 Before It Destroys Your Engine If your vehicle’s EINS RED LINE is lighting up with code P0304, you’re probably noticing misfires in cylinder 4 — and that’s a warning you can’t afford to ignore. P0304, which signals an misfire in cylinder 4, doesn’t just rob your engine of power — it can wreak havoc over time if not resolved quickly. At Fix It Fast!, we believe every misfire must be eliminated before it destroys your engine. In this article, we’ll break down the causes of P0304, quick diagnostic steps, and proven fixes to get your engine running smoothly — and prevent costly damage down the road. ## Understanding P0304: What Does It Really Mean? P0304 corresponds to Engine Misfire Detected (Cylinder 4 Only). This fault code indicates that the air-fuel mixture in your fourth cylinder isn’t combusting properly during the stroke cycle. Unlike random misfires, P0304 often stems from specific, fixable issues — but left unchecked, it can escalate into severe engine damage, reduced fuel efficiency, increased emissions, and transmission stress.