Mercedes Benz

P0304 is a diagnostic trouble code (DTC) that indicates a misfire has been detected in cylinder 4 of the engine. In multi-cylinder engines, each cylinder is numbered, and cylinder 4 is typically the fourth cylinder in the firing order. As with P0301, P0302, and P0303 (Cylinder 1, Cylinder 2, and Cylinder 3 Misfire Detected, respectively), a misfire in cylinder 4 means that the air-fuel mixture in that specific cylinder fails to ignite properly or ignites at the wrong time. This can lead to similar issues, including a rough-running engine, reduced power, decreased fuel efficiency, and increased emissions. The potential causes of a P0304 code are quite similar to those of the previous misfire codes and include: 1. Ignition System Issues: A faulty spark plug, ignition coil, ignition wire, or ignition control module related to cylinder 4 can cause misfires. 2. Fuel System Problems: A clogged fuel injector, low fuel pressure, or a faulty fuel pump affecting cylinder 4 can result i...