P0304 OBD Error Code: Problem & Solutions

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The trouble code P0304 can be defined as Cylinder 4 Misfire Detected. Do you want to know what a misfire means? The meaning of misfire is just what it sounds like, a cylinder which is not firing as it should. The P0304 is a fault code which is caused due to a misfire on the number 4 cylinder. The misfire monitor diagnostic would be based on the variation in the crankshaft velocity. This information would be then determined by the powertrain control module by using the crankshaft position sensor as well as camshaft position sensor.

This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Cylinder 4 Misfire Detected?

• Issues in the plug wires, cap and rotor, and/or coil pack
• There can be some mechanical engine issue
• Leakage in the intake
• Some problems related to fuel
• Faults in the spark plug
• Some quirks in the coil pack
• Defaults in the oxygen sensor
• There can be some defects in the fuel injector
• The exhaust valve might be burned
• Faulty catalytic converter
• Problem of bad compression

1. Fuel Injector - OBD Code P0304 can appear because of faulty Fuel Injector.
2. Camshaft Sensor - There can be some issues with the Camshaft Sensor due to which you may see P0304 code appearing over and over again. Visit us to buy best quality Camshaft Sensor online.
3. Crankshaft Sensor - Are you facing some faults in your Crankshaft Sensor? Don’t worry and get them replaced or else P0304 code can turn up.
4. Head Gasket - Common cause behind this P0304 error code can be some fault in Head Gasket. So it will be a good decision to replace them now.
5. Oxygen Sensor - Camshaft Sensor is perfectly fine but still but having that trouble code P0304 flashing? In such a situation your Oxygen Sensor might be faulty. Why don’t you think of getting that replaced?
6. Powertrain Control Module - The P0304 code can also arise due to some issues in Powertrain Control Module. So, it is advised to replace them as soon as possible.
7. Spark Plug - P0304 code does not really end up spoiling your Head Gasket, but it might also accompany few Spark Plug issues. We have best Spark Plug with us.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0304 here:

Common Symptoms

• Issue of engine misfire
• The car engine might run poorly or might have trouble in running
• Check engine light mat start appearing
• There can be lack of engine power
• There can be a decrease in the fuel mileage

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0304:

• Make sure that you replace the spark plug for all cylinders
• You can always replace the cap & rotor, coil pack, or spark plug wiring as per the requirement
• Carefully repair the leakage in the intake
• If there are some fuel issues, then they should be corrected
• The issues in the engine should be fixed

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Here are some steps which you should follow in order to diagnose this fault code:

• A scan tool should be hooked up by a mechanic to check for any current, history, or pending codes
• After that freeze frame data should be noted
• Clear all the codes and the vehicle should be taken out for a test drive
• Then a visual inspection should be performed looking for wear, broken components, leaks, and damaged wiring
• Use a scan tool to check the misfire counter for cylinder 4 during operation
• Check long-term fuel trims to verify if any fuel or intake issues are present
• There can be some cases where the spark plugs may be pulled and as well as inspected

Common Mistakes When Diagnosing The P0304 Code

• A number of mistakes can be made is all the damaged components are not tested properly or the unnecessary components are replaced
• It is important to avoid this and for that make sure that you do not skip any step
• If you will replace the spark plugs as well as wires, it would fix this issue for most of the vehicles
• People do not test the entire system, which can turn out to be a big mistake