P0304 on Honda Cr-V
Cylinder 4 Misfire Detected
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Honda Cr-V context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0304.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0304 Means on Your Honda Cr-V
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.
Real Honda Cr-V Owner Reports
Source: NHTSA Complaints Database
"On startup all safety warning lights flashed on and disabled all safety driving aids. This persisted and took to Honda dealer. Their diagnostics revealed faulty fuel injectors with code P0304 failed number 4 cylinder. Recommend replacing fuel injector go for $2000."
"The vehicle experienced multiple system failures, indicated by error messages in 11 different systems, including the check engine light."
"I own a 2017 Honda CRV EX AWD. While driving downhill on a mountain road on Dec. 9, 2023, all of my dashboard warning lights and alarms began flashing and sounding off. Some of the warnings cycled through one after another while others were simultaneous."
"When I was driving on highway when moving from Texas to Indiana, about 11 warning lights were suddenly on."
"Fuel injector for Cylinder 3 failed. This has been a 6 month issue starting with simple cold start issue misfire with cylinder 3 (didn't know this was the issue then)."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Honda Cr-V
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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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.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.