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p0304 code cylinder 4 misfire detected causes symptoms fixes

The Lists Norml Team

5 min read · Jun 01, 2026

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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.

P0304 means cylinder 4 is misfiring. Learn symptoms, common causes, diagnosis steps, proven fixes, repair cost ranges, plus trusted external resources for deeper help.

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...

P0304 means cylinder 4 is misfiring — usually a bad spark plug or ignition coil. Swapping the coil to another cylinder is the fastest way to confirm the cause before spending any money on parts.

Jan 13, 2026 · How to fix the P0304 code fast and prevent further engine damage? Discover essential steps to resolve cylinder 4 misfire effectively.

Feb 10, 2026 · 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.

Nov 29, 2024 · A P0304 code indicates a cylinder 4 misfire, which can significantly impact your vehicle’s performance. When one cylinder isn’t functioning properly, the entire engine struggles to maintain …

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 …

Jan 3, 2026 · This guide outlines a systematic, step-by-step approach to diagnosing and resolving the P0304 code, focusing the investigation solely on the components related to cylinder four.