Skip the auto shop - Our mechanics make house calls

Q: Check engine light

asked by on

Random misfire in codes, replaced plugs, can't get check engine light to go off any suggestions?

My car has 80000 miles.
My car has an automatic transmission.

Hi there, thanks for your question. I’d be happy to help. A [misfire can be caused by a variety of things other than bad spark plugs such as bad plug wires, vacuum leak, dirty fuel injectors, a weak fuel pump (low fuel pressure) or a faulty fuel pressure regulator or weak ignition coil to name a few others. I would recommend having an expert from YourMechanic come to your home to diagnose using a scan tool to be sure there are not more codes indicating other components that need to be repaired.

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!

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: rough start, high idle on start, missfiring and bogging out

If you have a check engine light on then have it tested to see what fault codes are present. You should still be under warranty and the dealer will fix it for free if it's a failed part. If it...

Q: Took my car through inspection and it passed. Did emissions and I was told that I need to replace the muffler catylic converter and o2 sensor. Is this true?

Hi there. From the description you have provided, your vehicle passed inspection but failed emissions, this would lead me to believe the Check Engine Light is on. Knowing the code(s) could help with diagnoses. A plugged catalytic converter(s) could prevent...

Q: i have a 2005 buick lacrosse someone touch pos on neg on a jumpstart and now it doesn't do anything

This happens so often that I strongly advise people not to attempt to jump start their cars. The amount of damage that can be done in an instant by accidental reversal of the cables can vary from a few blown...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...