changing the transmission filter on my 2003 mercury grand marquis and a little plastic yellow piece with an o-ring on it fell out . What is this part and is it important and where does it go?


Asked by Aug 05, 2012 at 01:49 PM about the 2003 Mercury Grand Marquis GS

Question type: Maintenance & Repair

2003 Mercury Grand Marquis needing transmission fluid and filter changed due to severe contamination.

4 Answers


It s a factory piece only used in production. It serves no purpose now. -- throw it away and carry on!

5 of 5 people found this helpful.

Thank you a whole lot. That helps and people like you make things so much easier. Do you have any idea what purpose this thing served?

1 of 1 people found this helpful.

Can anyone tell me why my parking lights won't work? Same car. My husband also wants to know how he can dry fill the transmission?


That piece was used as the trans dip tube seal. So when the car was assembled and the dipstick was added it pushed it into the bottom of the transmission pan. To add trans fluid, put a funnel into the trans dipstick tube. As far as the parking lights, you'll have to look at the headlght switch and wiring. Might have melted or corroded and or come loose.

1 of 1 people found this helpful.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,729 nationwide Grand Marquis listings starting at $1,700.


Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
  • #2
  • #3
View All

Related Models For Sale

Used Ford Crown Victoria
11 Great Deals out of 1,193 listings starting at $1,995
Used Lincoln Town Car
43 Great Deals out of 1,786 listings starting at $1,495
Used Chevrolet Impala
611 Great Deals out of 34,797 listings starting at $1,250
Used Chevrolet Tahoe
648 Great Deals out of 36,708 listings starting at $1,800
Used Ford F-150
2,224 Great Deals out of 182,699 listings starting at $1,500
Used Ford Taurus
246 Great Deals out of 17,885 listings starting at $1,499
Used Ford Mustang
756 Great Deals out of 42,813 listings starting at $1,300
Used Honda Accord
1,030 Great Deals out of 63,282 listings starting at $999
Used Chevrolet Silverado 1500
2,148 Great Deals out of 183,564 listings starting at $1,898
Used Buick LeSabre
23 Great Deals out of 1,893 listings starting at $1,588
Used Cadillac DeVille
1,685 listings starting at $1,988

Used Cars For Sale

2008 Mercury Grand Marquis GS For Sale
51 listings starting at $3,995
2007 Mercury Grand Marquis GS For Sale
3 Great Deals out of 26 listings starting at $1,700

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.