What causes P1303 on a Honda?

Failing spark plug or coil on cylinder 3 Clogged cylinder 3 fuel injector Vacuum leak at the intake runner for cylinder 3 Low compression on cylinder 3 Faulty spark voltage detection module

How do I fix P1303 on a Honda?

Confirm the code and check for other misfire codes Inspect the spark plug and coil on cylinder 3 Check fuel pressure and the cylinder 3 injector Run a compression test on cylinder 3 if spark and fuel check out Repair the cause found Clear the code and retest

P1303 The powertrain control module saw misfire in cylinder 3

Q: What does P1303 mean on a Honda?

P1303. The powertrain control module saw misfire in cylinder 3. The engine may run rough, shake at idle, or lose power.. Applies to Honda and Acura models that use this code.

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: Honda and Acura models that use this code

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

What does P1303 mean on a Honda?

P1303. The powertrain control module saw misfire in cylinder 3. The engine may run rough, shake at idle, or lose power.. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of P1303

Failing spark plug or coil on cylinder 3
Clogged cylinder 3 fuel injector
Vacuum leak at the intake runner for cylinder 3
Low compression on cylinder 3
Faulty spark voltage detection module

How to fix P1303

Confirm the code and check for other misfire codes
Inspect the spark plug and coil on cylinder 3
Check fuel pressure and the cylinder 3 injector
Run a compression test on cylinder 3 if spark and fuel check out
Repair the cause found
Clear the code and retest

Sources and review

Checked against two independent sources.
Last updated 2026-10-10.