So, the code P0204 will cause the P0304 code. I would check the electrical connector at the #4 and if it looks okay replace the fuel injector.
P0204 - Injector Circuit/Open - Cylinder 4: This code indicates a problem with the fuel injector circuit for Cylinder 4.
P0304 - Cylinder 4 Misfire Detected: This code signals that the engine's computer (ECU) has detected a misfire in Cylinder 4.
Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:
https://www.2carpros.com/articles/how-to-replace-a-fuel-injector
You will need to remove the upper intake manifold to do the job. Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Monday, September 11th, 2023 AT 1:06 PM