Question

2000 Kia Sephia 1.8L, I need your help with this code p0304

Answer 1

Hi there,

Typically on these the issue is with the ignition coil. Sometimes if you spray some water on the coils while the engine is running you will see sparks arcing and the engine will run rougher.

Answer 2

P0304 KIA - Cylinder 4 Misfire Detected
Read more: https://www.autocodes.com/p0304_kia.html