What causes P1204 on a Honda?

Clogged or sticking cylinder 4 fuel injector Failing cylinder 4 coil-on-plug or worn spark plug Low fuel pressure affecting cylinder 4 delivery Vacuum leak near the cylinder 4 intake runner Low compression on cylinder 4 from valve or ring wear

How do I fix P1204 on a Honda?

Confirm the cylinder 4 misfire counter with a scan tool before touching parts Swap the cylinder 4 coil and plug to another cylinder and see if the misfire follows Test the cylinder 4 injector flow and resistance Check fuel pressure against spec under load Compression test cylinder 4 if spark and fuel check out

P1204 Fuel System Failure Caused No

Q: What does P1204 mean on a Honda?

P1204. Fuel System Failure Caused No. 4 Cylinder Misfire. Applies to Civic, Accord, CR-V.

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: Civic, Accord, CR-V

This fault is part of the Honda misfire codes guide. It covers the system and the order to check it.

What does P1204 mean on a Honda?

P1204. Fuel System Failure Caused No. 4 Cylinder Misfire. This Honda-enhanced code applies to Civic, Accord, CR-V.

Common causes of P1204

Clogged or sticking cylinder 4 fuel injector
Failing cylinder 4 coil-on-plug or worn spark plug
Low fuel pressure affecting cylinder 4 delivery
Vacuum leak near the cylinder 4 intake runner
Low compression on cylinder 4 from valve or ring wear

How to fix P1204

Confirm the cylinder 4 misfire counter with a scan tool before touching parts
Swap the cylinder 4 coil and plug to another cylinder and see if the misfire follows
Test the cylinder 4 injector flow and resistance
Check fuel pressure against spec under load
Compression test cylinder 4 if spark and fuel check out

Sources and review

Last updated 2026-09-07.