P0304 is a reasonably common trouble code with any vehicle, that contains the Mazda 6. It’s and OBD2 code and stands for:

P0304: Misfire detected → Cylinder 4

P0304 is certainly a reason for concern, and also should be taken into consideration a threat to the drivability her 6. The pretty thing around P0304 is that it’s a cylinder specific trouble code, which provides diagnosing the problems simpler 보다 P0300, which means that the cylinders are randomly misfiring.

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It will often be attach by codes P0301, P0302, P0303, etc…. These certain codes indicate that there is a misfire in cylinder’s one, two, and three respectively.

Fixing P0304 must be thought about a high priority. Unequal a most the OBDII codes, this code needs to do directly with engine combustion. It additionally can cost money to ignore it, since driving with a misfire can damages the vehicle’s catalytic converter. The engine is likewise not firing all of the fuel, so life fuel is also passing v Cylinder 4 into the exhaust. Mileage may suffer as well when your 6 has actually P0304 as well.

Mazda 6 P0304 Definition

P0304 is a cylinder details misfire code, which means that Cylinder 4 is misfiring and also causing the code. Critical thing to know when detect the place of Cylinder 4 is the it’s going to be the 4’th cylinder in the firing order of the vehicle, and not the 4’th cylinder that you could see once looking in ~ the engine.

6 P0304 OBDII code Symptoms


The P0304 trouble password will create the 6’s service engine quickly light. The automobile itself may begin to run rough. It relies on exactly how serious the misfire is. The car may produce excess vibration, particularly at reduced RPM. Fuel mileage might suffer. You may smell raw gas coming from the tail pipe. The automobile may backfire.

P0304 Trouble password Diagnosis- Mazda 6

There are rather a couple of things that can cause the P0304 trouble password to cause the Mazda 6. Here are the most typical problems that will certainly throw the code. They space presented somewhat in bespeak from many to the very least likely to be causing the code:

Cam or Crank Sensors– This one is really unlikely, but it does happen. If the ECU is not gaining the right signal from this sensors, the vehicles time is not going come sync up and also it’ll misfire. Low Compression– If you have actually a leaking head gasket, bending valve, cracked head, etc.. That would reason compression to not be together high together it should, you’re going to obtain P0304. Girlfriend should additionally feel the auto is under on strength as well.

Most common P0304 Fixes


If you follow the items detailed above girlfriend should have the ability to fix the P0304. Here’s just how to go about it:

Inspect and also test the parts of the ignition system around the cylinder to recognize whether or not you have to replace the coil packs, plugs, or wires. Most of the time one of those three points will end up being the problem.

You need to reset the problem codes and also swap the coil pack, wire, and plug native Cylinder 4 to another. If you acquire a different P030X code, you’ll understand that one of those three components is bad, due to the fact that by relocating those contents you have changed which cylinder the trouble code has actually registered in. After that, walk ahead and replace lock or have actually them tested. It’s an easy, and also cheap technique of identify if her ignition components have gone bad.

After that you would desire to check the fuel injection system. There space links above that’ll display you how to execute that. If the doesn’t work, it may be time to do a compression test and see if you have actually a leak in that cylinder.

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Is P0304 a serious Concern?

P0304 is reason for concern and left unfixed have the right to leave girlfriend stranded or do the auto virtually un-drivable. Solving the trouble causing the code to fire have the right to save girlfriend time and money and also keep your Mazda 6 from break down. Quick action may likewise save her catalytic converter native going bad. Great luck diagnosing the issue. If over there is anything that you would choose to add please leave a comment below.