Skip the auto shop - Our mechanics make house calls

Q: Why does my car lose power at 20 miles an hour and 60 miles an hour and my check engine light goes on and off

asked by on

Sometimes when I'm driving I get to 20 miles an hour and the car starts to lose power then it picks back up after I cut the car off and cut it back on then when I'm getting up to 60 miles an hour does the same and when I cut the car off and cut it back on I get all the power again what's my problem

My car has 154000 miles.
My car has an automatic transmission.

A: Hello. It sounds like you may have a sensor...

Hello. It sounds like you may have a sensor issue going on with your car. Most of the time when something like this occurs it is caused by a throttle position sensor that is not working properly. It can also be caused by worn out fuel system or ignition system parts but it is most commonly a sensor. I will usually install my scan tool and drive the vehicle while monitoring what the sensors are doing. This would tell me if there is a sensor issue going on. If the sensors are reading correctly then I inspect the ignition system and also test the fuel pressure. If you are looking to have this loss of power checked, consider having a YourMechanic certified technician come to your home or office to diagnose why it is losing power.

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: Sluggishness and Breaks

Hello, there is a variety of causes for the vehicle feeling sluggish. If there is a Check Engine Light on the dashboard and the vehicle than diagnosis with a scan tool will be required. If no Check Engine Light...

Q: Brakes get locked briefly

Hi there. Thanks for writing in about your 2003 Lexus SC430. Another brake component that may cause the brakes to stick are the front and rear calipers. The calipers are what presses the brake pads against the rotors. If the...

Q: I'm thinking of buying a 2007 lexus GS450H, its a hybrid with 101829 miles on it, do i have to worry about the batteries? and if s

Hello. First off, your vehicle is equipped with a timing belt. This should be changed soon if it has not already. As for the battery, I typically see these last until about 120,000-150,000 miles. If you need quotes for these,...

Related articles

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...