Q: Car shaking, engine light and traction off. Codes P0300, P0301, P0304, and P0351

asked by on

Car shaking, engine light and traction off. Codes P0300, P0301, P0304, and P0351. I replaced spark plugs like 2 weeks ago and now this is happening. I just checked them again as well the coils ans they seem to bw working just fine.

My car has 40000 miles.
My car has an automatic transmission.

Hi Getze. Thanks for contacting us tonight. The OBD-II codes you’ve indicated show that you have a series of random misfires - specifically on cylinders #1 & #4. This may be caused by the new spark plugs or the plug wires being incorrectly installed. If the plugs are not the recommended ones or not properly gaped, it can also cause this issue. I would recommend verifying that your plugs are correctly gaped as recommended by Toyota (not the spark plug manufacturer) and that each plug wire is correctly installed first. Second, you might want to read this article on the P-0300 OBD-II code, as it will list all the possible sources, so you can begin your inspection and correctly isolate the root issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Car shaking, engine light and traction off. Codes P0300, P0301, P0304, and P0351

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: Can I drive with just one lug nut loose on one tire? The nut is stripped so I cannot take it off. But 3 out of 4 nuts are on tight

Hi there. I've seen many vehicles on the road with a lug nut missing and it does seem to work. However, what these people are unaware of is that improper/uneven wheel nut torque is a major cause of brake vibrations....

Q: Clutch is soft

Hi there. There are a few issues that can cause this: It sounds like you may have an issue with the clutch master cylinder again, or the slave cylinder may be binding. Both of these would have to...

Q: Replaced the starter, it's spinning correctly but not turning the engine over

The starter requires a proper amount of voltage and amperage to engage the starter to the engine and turn it so the engine can be started. If you have a weak or bad battery or one of the battery cables...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.