Skip the auto shop - Our mechanics make house calls

Q: Misfire on cylinder 4; error code P0304

asked by on

I know I have a misfire on cylinder 4 (error code P0304), but I can't find the problem.

The misfire is caused by one or more of several possible causes: the coil, a spark plug, an injector, wiring, compression in the cylinder, or the computer for the engine. Any one of these could be the culprit and diagnosis can be made only after a thorough check of each item. I recommend you have a mechanic like one from YourMechanic inspect your vehicle’s misfiring issue to see what repairs you need moving forward.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Misfire on cylinder 4; error code P0304

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Where is the storage box located?

Your car may or may not have a storage box. It will depend on the trim level and whether you have a coupe or a sedan. If you do have a storage box, you may have one of two possible...

Q: have been told engine harness needs replacing after last time with same issue told it was new battery that cost 500.00. Is the car

As long as the vehicle is not displaying unintended (uncommanded) acceleration and the brakes and all safety features are fully functioning, the car is safe to drive. However, that is not to say that the car won't "break down" on...

Q: There was a squeaking noise on the passenger side but it went away and I don't know what it was.

Hi there: In some cases, the squeaking sound that is coming behind the glove box is attributed to the air conditioning or heater blower motor. If you had either of these two components activated when the noise came on, this...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...