Last reported case: 3 months ago
Based on 8 owner reports, 8 from forums)
What is P0303?
P0303 indicates the engine's computer has detected a misfire specifically in cylinder 3, which is a critical powertrain issue that can damage the catalytic converter if ignored. Based on real owner data, this code is most frequently triggered by ignition system failures, particularly in vehicles like the Ford F-150, Honda Accord, and Chevrolet Spark. Owners report it often occurs around 80,000-130,000 miles and can cause noticeable drivability problems.
Common Causes:
- Faulty ignition coil on cylinder 3 (most frequently cited fix in owner reports)
- Worn or fouled spark plugs (commonly replaced alongside coils in maintenance)
- Potential head gasket issues mentioned specifically for Honda Accords by a service manager
Symptoms:
- Engine shudder or vibration, especially noted in Ford F-150 transmissions
- Check Engine Light is illuminated
- Reduced engine power and rough idling
- Occasional traction loss or fishtailing in performance vehicles like the Ford Mustang
πP0303 on 2010 HONDA Accord
This page focuses specifically on P0303 issues reported by 2010 HONDA Accord owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 HONDA Accord Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 HONDA Accord owners
βI had a CEL come on out of the blue (solid, not flashing) along with the VSA light, and the triangle with exclamation point warning. I was able to baby the car home.βView original
βOriginal owner, perfect mechanical condition before this issue. I had a CEL come on out of the blue (solid, not flashing) along with the VSA light, and the triangle with exclamation point warning.βView original
βEngine is running smoothly now and no longer rough and check engine light went away on its own. I cleared the codes then scanned the car and I'm still getting P0303 and now also getting P0356.βView original
βThe other day I swapped out all of the spark plugs with the new ones and replaced the #3 coil. At first I swapped out the #3 coil and spark plug and I had disconnected the #6 coil and forgot to reconnect when I started the engine.βView original
βOften the engine runs better after I reset the CEL. I replaced early (had 20-25K on them) my spark plugs with the factory type and I got a new cap and rotor.βView original
βI drove (very low power, missing badly, stalled once at a red light) a few miles to the shop & read the codes (Blue Driver). P0401 (EGR System leak detected) P2646 (ΒAΒ Rocker Arm Actuator System performance/Stuck off bank 1) P0301, P0302, P0300, P0304 Cylinders misfiring (no P0303).βView original
βI ran the codes and have a P0303, so i decided to take it to the shop. By the time they got to it the engine light was off again, they still ran a test to see if the car misfired and so far it was 0.βView original
βGood evening guys, Today I felt my 2003 Honda Accord V6 EX (Around 166,000) engine struggling a bit. Check engine light was blinking then it would stop and then blink again.βView original
βHi, I have a 2001 Accord, F23A4. Approx month after I got my EGR passages professionally cleaned out, I get a random every few weeks or sometimes take a month to occur, a P0303 and P1399...βView original
βI arrived & started the engine to see if it could be moved in what I assumed to be limp mode. I drove (very low power, missing badly, stalled once at a red light) a few miles to the shop & read the codes (Blue Driver).βView original
These are real experiences shared by 2010 HONDA Accord owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 8 discussions about P0303 from 2010 HONDA Accord owners across automotive communities.
Success rate (25%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 12/1/2025