P0303 on HONDA ACCORD
Cylinder 3 Misfire Detected
What P0303 Means on Your HONDA ACCORD
P0303 is a diagnostic trouble code indicating: Cylinder 3 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 ACCORD Owner Reports
Source: NHTSA Complaints Database
"For the 2nd time since 2008, i've had to replace the sparkplugs due to pcm issues. the engine light will come on and gives an error code of p0303. unfortunately you can only go to honda to have the computer updated, and they will try to sell additional services."
"While driving at about 55 mph on route i-287 in morristown, nj, the car began to shake badly and the engine made a loud rumbling noise. i got the car to my local service station in morristown, where my mechanic told me that one of my spark plugs had failed to function, having been badly oil fouled."
"Burning oil excessively since i have had the car. i never got a recall notice. having to add a qt or better a week. june 12 it stalled out all the way home from work. that was a sunday. just checked the oil on thursday. oil was okay in thursday. on sunday no oil to show on dipstick."
"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."
"While driving, my 2018 Honda Accord suddenly lost power and went into limp mode with no prior overheating or warning signs. The acceleration dropped instantly, and the vehicle nearly caused an accident as it seized up in traffic."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on HONDA ACCORD
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.