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P0303 on HONDA ACCORD

Severity
Medium
NHTSA Reports
10
Most Affected
2018, 2008, 2009

What P0303 Means on Your HONDA ACCORD

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."

— 2008 HONDA ACCORD owner • POWER TRAIN,ELECTRICAL SYSTEM,ENGINE • Filed 10/01/2013

"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."

— 2009 HONDA ACCORD owner • ENGINE,FUEL/PROPULSION SYSTEM • Filed 01/30/2017

"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."

— 2010 HONDA ACCORD owner • STRUCTURE,UNKNOWN OR OTHER • Filed 06/12/2016

"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

"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."

— 2018 HONDA ACCORD owner • ENGINE • Filed 10/03/2025

Data from NHTSA Vehicle Complaints Database. All reports are filed by vehicle owners directly with the U.S. Department of Transportation.

Common Causes of P0303 on HONDA ACCORD

30%
20%
20%
10%
10%

Percentages based on NHTSA complaint component analysis for this vehicle.

Complaint Trend by Year

2008
1
2009
1
2010
1
2011
1
2018
5
2019
1

What To Do Next

  1. 1
    Check for recalls on YOUR VIN

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if your vehicle is covered.

  2. 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. 3
    Compare repair quotes

    Get 2-3 quotes. Dealer vs independent shop prices often differ 30-50% for the same repair.

P0303 on Other Vehicles

Data sourced from the National Highway Traffic Safety Administration (U.S. Department of Transportation) and the SAE J2012 OBD-II standard. Code definitions follow the SAE J2012 / ISO 15031-6 standard. Owner reports are filed directly with NHTSA by vehicle owners. This information is provided for educational purposes only and should not replace professional automotive diagnosis. Always consult a qualified mechanic for vehicle repair decisions.

Last updated: March 2026