P0304 on HONDA ACCORD — Cylinder 4 Misfire Detected

Q: "What does P0304 mean on a HONDA ACCORD?"

"P0304 indicates: Cylinder 4 Misfire Detected. This is a ignition system code. 16 HONDA ACCORD owners have reported this to NHTSA."

Q: "What are the most common causes of P0304 on HONDA ACCORD?"

"Based on 16 NHTSA reports, the most commonly cited components are: Engine, Electrical System,Engine, Steering,Unknown Or Other,Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0304 serious on my HONDA ACCORD?"

"Of 16 NHTSA reports for this code on HONDA ACCORD, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my HONDA ACCORD shows P0304?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0304 Means on Your HONDA ACCORD

P0304 is a diagnostic trouble code indicating: Cylinder 4 Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

16 HONDA ACCORD owners have reported this issue to NHTSA across model years 2011-2022. Most reports come from the 2018, 2019 model years.

Real HONDA ACCORD Owner Reports

Source: NHTSA Complaints Database

"On 4/5/19, my wife's honda pilot ex experienced severe engine problems on the road in fairview tn resulting in an inability to accelerate, hesitation when the gas pedal was depressed, and a flashing 'check engine' light."

— 2011 HONDA ACCORD owner · ENGINE · Filed 04/05/2019

"Driving on freeway went and applied foot to gas pedal and car goes into limp mode causing in ability to drive as there isnt any power and mil light starts to blink and or will set and if it sets the traction steering and tp light also come on."

— 2015 HONDA ACCORD owner · STEERING,UNKNOWN OR OTHER,ENGINE · Filed 01/10/2022

"I have a 2016 honda accord touring with 102k miles vin# [xxx] , on 09-03-2020 was driving south on i-295 to orange park fl with my grand daughter [xxx] and daughter [xxx] and before exit to collins rd, my vehicle check engine light came on flashing and my honda accord turn off while driving in the m"

— 2016 HONDA ACCORD owner · UNKNOWN OR OTHER,ENGINE,FUEL/PROPULSION SYSTEM · Filed 09/03/2020

"On 11/3/25 honda conducted the fuel injection recall fix. Prior to this, no warning lights were displayed on dash. 11/11/25 nine different warnings displayed on dashboard board. 11/13/25 at approximately 35mph the vehicle would not accelerate and the 9 warning notifications continued to flash."

— 2018 HONDA ACCORD owner · VEHICLE SPEED CONTROL,UNKNOWN OR OTHER · Filed 11/03/2025

"Car had 80 thousand no heating or oil problems has been maintained through Honda. Recall on fuel pump replaced. Car starts rough, took it in a diagnostic was done revealing a possible leak near 3 cylinder possibly head gasket. Code P0304 came up with all break light codes reading. No oil leak."

— 2018 HONDA ACCORD owner · ENGINE · Filed 09/15/2025

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'11

1

'15

1

'16

8

'18

2

'19

1

'20

2

'22

Common Causes on HONDA ACCORD

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 31.2%

ELECTRICAL SYSTEM,ENGINE 12.5%

STEERING,UNKNOWN or OTHER,ENGINE 6.2%

UNKNOWN or OTHER,ENGINE,FUEL/PROPULSION SYSTEM 6.2%

VEHICLE SPEED CONTROL,UNKNOWN or OTHER 6.2%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0304 mean on a HONDA ACCORD? ▾

P0304 indicates: Cylinder 4 Misfire Detected. This is a ignition system code. 16 HONDA ACCORD owners have reported this to NHTSA.

What are the most common causes of P0304 on HONDA ACCORD? ▾

Based on 16 NHTSA reports, the most commonly cited components are: Engine, Electrical System,Engine, Steering,Unknown Or Other,Engine. These percentages are based on the component field in owner complaints.

Is P0304 serious on my HONDA ACCORD? ▾

Of 16 NHTSA reports for this code on HONDA ACCORD, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my HONDA ACCORD shows P0304? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.