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This video shows how to Diagnose and Repair Engine Rough Idle, Engine no Power, Engine Light Stays On Code P0304 for 2013 Hyundai Elantra 1.8
Hope this video will help someone.

P0304 is certainly a cause for concern, and should be considered a threat to the drivability your Elantra. The nice thing about P0304 is that it’s a cylinder specific trouble code, which makes diagnosing the problems simpler than P0300, which means that the cylinders are randomly misfiring.

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

Fixing P0304 should be considered a high priority. Unlike a lot of the OBDII codes, this code has to do directly with engine combustion. It also can cost money to ignore it, since driving with a misfire can damage the vehicle’s catalytic converter. The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 4 into the exhaust. Mileage may suffer as well when your Elantra has P0304 as well.

P0304 OBDII Code Symptoms
Hyundai Elantra P0304 Symptoms

The P0304 trouble code will trigger the Elantra’s service engine soon light.
The vehicle itself may begin to run rough. It depends on how serious the misfire is.
The vehicle may produce excess vibration, especially at lower RPM.
Fuel mileage may suffer.
You may smell raw gas coming from the tail pipe.
The vehicle may backfire.

My name is Boy Anthony
Licensed Automotive Service Technician 310 S
DriveShop Automotive - Owner

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