Q: Engine light and battery light is on.

asked by on

Engine light and battery light both came on stopped at AutoZone to have code read he said is a spark plug coil lights started dimming got home parked tried to restart battery dead

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

Hi there. Check the alternator and see if its not charging properly. Charge up the battery and start the engine. Check for a voltage on the battery with the engine running and see if its between 13.5 and 14.7 volts. If the volts are good, then turn on the headlights to high beams and operate all of the windows at the same time. If the lights dim out a lot, then the alternator is not producing enough amperage to recharge the battery with a large load drop. I then would recommend replacing the alternator. The ignition coils will stop working when the battery is low on a voltage and / or amperage. If you need further assistance with your battery going dead, then seek out a professional, such as one from Your Mechanic, to help you.

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

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!
  1. Home
  2. Questions
  3. Engine light and battery light is on.

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: Need to have a Check Engine warning checked out.

You will need to get a technician to check the codes on the computer and have them determine the problem as well as the price.

Q: No power at all

Check the voltage at the battery terminals for 12 volts at rest. While cranking the voltage shouldn't drop very much, about 10 volts. Jump the vehicle and observe the voltage while it's running. If the voltage isn't above 13.5 volts,...

Q: Battery light comes on and off replaced battery and altenator tested good at AutoZone?

If the battery is new and good, and the alternator is good and charging, the problem may actually be in the ignition switch. If you have another key, try using that one. Also, check your VIN number on safercar.gov to...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...