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. If the …

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...

What does the P0304 code mean? The P0304 code signifies a cylinder 4 misfire detected by your vehicle’s onboard diagnostics system. When this code appears, it indicates that the engine control …

Jul 8, 2024 · DTC P0304 indicates that a misfire has been detected in cylinder #4. Several problem areas can be at fault, including a bad spark plug or spark plug wires, a damaged ignition coil, or a …

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 comes back. If there …

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. Here are the …

Nov 29, 2024 · If you’ve seen the P0304 code flash on your dashboard, you might be feeling a mix of confusion and concern. A misfire in cylinder 4 can lead to poor engine performance and increased …

May 27, 2024 · The P0304 code indicates a misfire in cylinder 4. Read on to learn its symptoms, possible causes, as well as how to diagnose and fix the underlying issue.

OBD-II Code P0304 is defined as a Misfire Detected in #4 Cylinder. Want to Learn More? Generally, the term "misfire" refers to an incomplete combustion process inside the cylinder. When this becomes …