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: what should it cost to replace the evaporator on a 2003 lexus 430 sc

Hi, thank you for your question. To get a quote for this service, please enter your vehicle's information on our website at https://www.yourmechanic.com/book/, or give us a call at 1-800-701-6230 for further assistance. Toby S., YourMechanic Team

Q: Dead Car

The smoking from the cables may very well have been caused by having the cables hooked up backwards. You may want to have your charging system diagnosed by a professional from YourMechanic to be sure your alternator and battery are...

Q: 1999 Mercedes ML430 starts, I can move the shifter, but it doesn't go into gear. Just stays in park.

A differential can indeed fail without warning, but there are usually some ugly noises associated with it. As for your shifter, I believe your model still uses a lever connection between the shifter and the transmission. It should be easy...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.