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

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

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. If the …

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.

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.

Jan 3, 2026 · Before touching any components, verify the P0304 code using an OBD-II scanner, noting if any other codes are present, such as a general misfire code (P0300) or codes for other cylinders …

When the vehicle’s PCM/ECM notices an engine misfire, it sets up a particular trouble code. The engine code P0304 represents a misfiring in cylinder 4. This article mainly explains the P0304 code …

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 …

When the engine functions correctly, the cylinders fire in sequence to provide continuous power to the crankshaft. If the RPM of the crankshaft changes by more than 2%, this is when the engine will …