Discover the common causes of the P0304 diagnostic trouble code and learn how to troubleshoot a misfire in cylinder 4 of your engine.

Sep 7, 2024 · How to fix the P0304 code fast and prevent further engine damage? Discover essential steps to resolve cylinder 4 misfire effectively.

Oct 6, 2025 · If your car's ECM throws a P0304 trouble code, you have a misfire problem. Here are common symptoms, causes, and how to fix DTC P0304...

The P0304 code means that cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. …

Let’s dive deep into everything you need to know about the P0304 code—from its causes and symptoms to how serious it really is when that pesky light illuminates your dashboard.

Mar 22, 2025 · What does the P0304 Cylinder-4 Misfire Detected mean? P0304 code gets triggered when the Engine Control Module detects an engine misfire on cylinder-4. Misfire …

Faulty spark plugs, ignition coils and fuel injectors can cause a P0304 code. Swap each component with an individual part from another cylinder to assess the problem. If the issue …

Oct 30, 2024 · Here's everything you need to know to understand the check engine error code P0304, which indicates that the engine control module has detected a misfire in cylinder 4. …

This guide explains the P0304 code’s meaning, symptoms, causes, and step-by-step diagnostics to fix it like a pro—potentially saving you $500-$800 from overpriced cylinder misfire repairs.

Jul 8, 2024 · Keep reading as we explore what steps to take if a P0304 code occurs. You’ll learn about causes, symptoms, repairs, and the cars most likely to encounter a P0304 code.