Question about 2006 Mercury Mariner

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Yellow wrench in mercury mariner hybrid

Howdy. The yellow wrench that appears in the dashboard, used to go on and off. Now it just stays on, and "service soon" appears. I called the dealer, and he said it will be $150 to troubleshoot, and the problem could be fixed for cheap (under $20) or several hundred dollars. When I asked if I can continue driving the vehicle, w/o worry, I was told no issues. Can anyone provide insight into this issue? Tx. Geo

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1 Answer

The Yellow Wrench is what ford calls a MIL Lamp

That technology shouldn't be new to you or what you
do next

OBD2 Systems have been on all vehicles since 1996

All veh are the same

Any dash light you check for codes with a day or so,if
you want to know what the issues might be, then google the codes

I would just go to a repair shop immediately at any check light
being on.

You shurely know that a dealer is Never needed to work on any
vehcile & you also should know they charge more,a good reason
not to be there even with a new a car unless you there for free
warranttee work only

Yes you will pay $100 every time the dash light comes on
These shop have big investment in test equip

Finding the issuse if sometimes the entire job,the fix is not
always a big deal

Very bad advice for a dealer to tell you to continue to drive
a vehicle when they have no idea what is wrong.

You need those codes day one to determine if you should use it

Buy yourself a $60 code reader & google the codes on any
& all your vehicles so you can decide if you should be using it
at all.

Posted on Jan 21, 2013


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you can oder a cheap lcm from or sometimes u can just tap the lcm box and lights should turn back on.

Posted on Jul 10, 2010

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