Skip the auto shop - Our mechanics make house calls

Q: Warning light still on

asked by on

I fixed my alternator, and I was checking voltage in the trunk near the battery. I unhooked a wire from battery to a distribution box by accident, and the car shut off. It was a 2ga wire. I put it back on, started the car and had a warning light on the dash saying that I had an engine malfunction and reduced power. I unhooked the battery for 20 minutes and the warning light was still on. Do you know what the problem is?

A: I am not sure that there is actually a prob...

I am not sure that there is actually a problem. The warning indicator that was produced by the vehicle was likely in reaction to the wire being unplugged from the power distribution box. When a trouble code is stored it will usually take multiple drive cycles or an OBD2 scanner to reset the light. I would recommend having the warning reset with an OBD2 scan tool and this should resolve your issue. If you are noticing any drivability issues, a certified technician from YourMechanic can diagnose your Warning Light and help pinpoint the fault.

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・Save up to 30%

Get a quote

What others are asking

Q: My abs light came on

This suggests that you may have low tire pressure in one of your tires. The ABS light may also come on as a result of this for a couple of reasons. Your car is equipped with wheel speed sensors at...

Q: Can't shift bugger into neutral after a battery drain

Try putting in the key and only turning it to the first position before the key turns on and try to shift the shifter to neutral. If this does not work then you can open the hood and use a...

Q: Malfunctions in: seat belts, convertible top, water pump & battery

It seems like your 2012 BMW 650i has had a world of faults already. I'm not sure exactly how loose your seat belts were, but the belt in the vehicle is designed to be slightly more loose as the buckle...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...