Honda Civic · Diagnostic Trouble Code
P0303 — Cylinder 3 Misfire Detected
Quick overview of P0303 on your Honda Civic. Read the full diagnosis guide, then find the repair guides for your vehicle below.
Repair guides that fix P0303
Honda Civic
2012-2015 Honda Civic - Spark Plug Replacement
The most common misfire fix: a fresh set of plugs.
Honda Civic
2016-2021 Honda Civic - Ignition Coils
How to test and replace a bad coil pack.
Honda Civic
2016-2021 Honda Civic - Check Engine Light
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.