Skip the auto shop - Our mechanics make house calls

Q: Car stops accelerating and check engine light comes on momentarily while driving.

asked by on

On occasion while driving my car the theft light, check engine light, and battery light turn on and the speedometer will drastically drop for a second. It also feels like my car stops accelerating when this happens. This can happen when driving on the freeway or driving in town. Power relay maybe? Any advice?

My car has 180000 miles.
My car has an automatic transmission.

Hi there:

It is very possible that the issues you’re experiencing are cause by a faulty main relay issue on your 2003 Mercury Sable. However, it could be other issues ranging from your alternator to simple wiring or a minor ground issue. To determine precisely what’s causing this problem, you should have a professional mobile mechanic complete an engine is stalling out inspection.

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!
  • Home
  • Questions
  • Car stops accelerating and check engine light comes on momentarily while driving.

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: My engine sensor code said my catalytic convertor went out. Do I have replace all three or only one?

Hi there. There is only 1 catalytic converter that requires the O2 sensor to work with it. The other two are a catalytic converter to help with emissions and a resonating chamber to quieten the exhaust before the muffler. The...

Q: Air conditioner blows warm air

There are many reasons for poor AC performance, from low refrigerant, to a failed compressor. I suggest you have an AC performance test performed on your vehicle to determine the cause. This test involves hooking up gauges to the A/C...

Q: Had a spark plug blowout, but the threads are fine and intact, plug was able to screw right back into place. What can cause that?

This is a known problem with this engine and Ford/Mercury has a technical bulletin for installing an insert into the spark plug hole. You may not think that you don't have a loss of threads in the hole, but you...

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 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 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...