Skip the auto shop - Our mechanics make house calls

Q: I found this under the driver's side underneath my expedition but don't know what it is or where it goes

asked by on

I would have to send a picture its hard to explain

My car has 136000 miles.
My car has an automatic transmission.

Hello. If you have found a loose harness, connector then it may be possible that they go to a component or feature that is not currently installed on the vehicle. You may be able to tell if this is the case by examining the connector or wires. If they appear to be dusty as a result of being unmoved, untouched, then it may be possible that they are simply an extra connector. There are also several relays and modules installed underneath the dash. These look like boxes with harnesses going to them, and can come in different colors and sizes. They will either control the function or power of different features or components of the vehicle. You may be able to identify the specific component by inspecting it for a part number and looking it up.

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
  • I found this under the driver's side underneath my expedition but don't know what it is or where it goes

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: 1998 Ford Expedition - when I open just the driver side front door the dome light flickers on and off -- why?

The switch in the door frame is probably not making good contact. That is fairly easy to test just by bypassing the switch. If that is not the issue, a simple trace of the dome light circuit will reveal the...

Q: White smoke coming from hood

Hi there. White smoke coming from the engine is typically steam as opposed to oil burning, so it's quite possible that you may have a coolant leak or other issue not related to an engine failure. When the check engine...

Q: Spark plug popped-out

It is common on this engine for the spark plugs to pop, and there are two typical fixes: either the spark plug hole could have a new insert put into it, or the head will have to be replaced. I...

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...
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...
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...