Hyundai Tucson · Diagnostic Trouble Code
P0304 — Cylinder 4 Misfire Detected
Quick overview of P0304 on your Hyundai Tucson. Read the full diagnosis guide, then find the repair guides for your vehicle below.
Repair guides that fix P0304
Hyundai Tucson
2016-2021 Hyundai Tucson - Spark Plug Replacement
The most common misfire fix: a fresh set of plugs.
Hyundai Tucson
2016-2021 Hyundai Tucson - Ignition Coils
How to test and replace a bad coil pack.
Hyundai Tucson
2016-2021 Hyundai Tucson - Check Engine Light / OBD2 Diagnosis
What that light means and what to check first.
General diagnostic information, not a factory service procedure. If you're unsure, have a qualified technician confirm the diagnosis before buying parts.