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

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.

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...

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.

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 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. …

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.

In this case it's cylinder #4. A code P0304 may mean that one or more of the following has happened: If there are no symptoms, the simplest thing to do is to reset the code and see if it …

When they don’t fire correctly, your car will drive rough and be at risk for further damage. The P0304 OBD2 code is your first warning sign of misfires in your engine. The P0304 code can …

2 days ago · Use this structured diagnostic guide to fix your P0304 cylinder 4 misfire. Methodically test ignition, fuel delivery, and compression issues.