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Code P0304?

Tiny
JGONZO2398
  • MEMBER
  • 2008 HONDA ACCORD
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 158,740 MILES
So, I got into my car in the parking garage after work today and it had a rough start with the check engine light flashing and the VSA light also came on. I scanned it and the above code showed up. I replaced my spark plugs and ignition coils last year in September, and I did my most recent oil change in the beginning of September this year. I’ve had a similar problem a couple years ago with similar codes and low oil is what caused it. I went to a nearby AutoZone and bought a quart of oil, topped it off and also disconnected and reconnected the cylinder 4 coil. This stopped the flashing check engine light and rough engine idle, but the same code remains. What can this be?
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Wednesday, November 13th, 2024 AT 5:17 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

If you resolved the cylinder misfire, the code needs to be cleared. Are you able to have that done? Also, it may eventually clear itself, but I can't tell you how many miles or starts it will take.

Let me know.

Joe
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Wednesday, November 13th, 2024 AT 6:38 PM
Tiny
JGONZO2398
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  • 357 POSTS
I forgot to mention, the oil level was normal, that was just a measure I took because I had a similar issue in the past. I checked the spark plug and it looked fine, as well as the coil, so I left it as it was. I cleared the engine light for now so I will see if it returns.
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Wednesday, November 13th, 2024 AT 6:58 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

Thanks for the update. Let me know if it returns. Hopefully, it won't. LOL

Take care of yourself.

Joe
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Thursday, November 14th, 2024 AT 7:56 PM
Tiny
JGONZO2398
  • MEMBER
  • 357 POSTS
Will do, I went ahead and replaced both the spark plug and ignition coil just to be sure.
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Thursday, November 14th, 2024 AT 10:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
That was a good idea. Hopefully, it is resolved.

Take care of yourself.

Joe
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Friday, November 15th, 2024 AT 9:30 PM

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