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What does p0304 code mean? Obd-ii code p0304 is defined as a misfire detected in 4 cylinder. 2013 ford escort concept 2013 ford escape 2013 ford ecosport 2013 ford c-max hybrid 2013 ford c-max energi 2013 ford b-max 2013 ford atlas concept 2012 ford tourneo custom concept 2012 ford territory 2012 ford ranger wildtrak 2012 ford ranger 2012 ford mustang cobra jet twin-turbo concept 2012 ford mustang boss 302 laguna seca 2012 ford. The p0304 code means that the 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. The p0301 code on your ford ranger is letting you know that it has detected a misfire condition on the cylinder closest to the front of the engine. P0304 code definition p0304 is a diagnostic trouble code seen when a misfire is detected in cylinder 4. This code may be seen with other misfire codes and lean rich codes. the p0303 code means that the cylinder 3 is misfiring or is randomly misfiring. What does that mean? This diagnostic trouble code (dtc) is a generic powertrain code, which means that it applies to obd-ii equipped vehicles. Although generic, the specific repair steps may vary depending on makemodel. Diagnosing codes p0300, p301, p0302, p0303, p0304, p305, p0306, p0307, p0308. Bad fuel injector will cause a rough idle misfire condition. The computer could be commanding a lean mixture due to a dirty maf sensor, a bad oxygen sensor, or a leaking fuel injector. In those cases, the computer is trying to throttle back the gas to correct for what it saw previously as a too rich mixture. Or, the lean mixture could be caused by the proper amount of gas and a vacuum leak. P1131 ford meaning the heated oxygen sensor (ho2s) monitor is an on-board strategy designed to monitor the ho2s sensors for a malfunction or deterioration that can affect emissions. Under specific conditions, the fuel control or upstream ho2s sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean).