Transmission Oil Leaks from Left Side Half Shaft Area on Mercury Mariner

If the transmission oil leaks out of left side half shaft area, it may be from a worn axle shaft seal. The seal can be damaged by a poor surface finish on the axle shaft. The axle shaft and seal should be replaced to correct the problem.

RepairPal Verified
Average mileage: 54,976 (11,000–98,000)
Drive Trains affected: 2WD, 4WD
4 model years affected: 2008, 2009, 2010, 2011
27 people reported this problem
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
Viewing 1 - 20 of 20 problem details
2009 Mercury Mariner - 4WD 21,753 mi,
Transmission fluid was leaking from driver side axle shaft. Ford replaced this part and corrected the problem. My local Gurnee, IL ford was thorough.
2010 Mercury Mariner 47,000 mi,
leakage of transmission fluid on left side, axle leakage
2008 Mercury Mariner - 2WD 85,000 mi,
Driver side transaxle seal leaking. had to replace oil pan gasket and crank seal 280.00 in labor and 14.55 seal and 54.47 for gasket, $349.02 total at my Ford Dealership, Caranfa Ford in Bellevue, Ohio 44811.
2010 Mercury Mariner 64,000 mi,
leaking left side half shaft.
2009 Mercury Mariner - 4WD 18,000 mi,
My 2009 Mercury Marina was leaking oil from the left side Half shaft seal and bearing like so many others . Now the same thing is happening on the Right side seal and bearing area. Been back and forth with Ford on this as my car is 14 days over the 100,000 mile 5yr warranty. I stuck to my guns with this issue and only because of the low mileage. Ford did repair the left side, but now I am having a waiting period to get the right side done. The garage (Ford) said it was a trans oil filler dipstick tube that was leaking but they have been wrong on this as they fixed that and it is still leaking bad. Getting a little upset with going back and forth with Ford on getting this nuisance oil leak fixed right. Great car for the little use I give it, these things should not occur at this mileage.
2009 Mercury Mariner - 4WD 51,000 mi,
axle seal replaced and lasted less than 2 months. Going back to dealer tomorrow for more repairs, possibly replacing axle assembly.
2009 Mercury Mariner - 2WD 84,000 mi,
I was told I have a transmission half case leak. I just can't believe this because I am original owner and consider my car still new!! I have done regular maintenance on it and mostly highway driving, very seldom over 65 mph! I think ford should cover this defect as I see how many others have had the same problem!!! very very upset - given an estimate of $4100 to repair.
2011 Mercury Mariner 76,778 mi,
Heard a ticking sound coming from the vehicle. Pulled over and checked all the fluids. All the transmission fluid was gone. I took it to the dealer and they told me the half shaft was needing replaced. Luckily my extended warranty covered the cost.
2010 Mercury Mariner 98,000 mi,
Changed oil and filter. A few days later noticed oil on garage floor. Discovered leak from the left side half shaft.
2009 Mercury Mariner - 2WD 68,000 mi,
Leaking fluid from left axle half shaft seal.
2009 Mercury Mariner - 2WD 65,000 mi,
changed oil and filter and noticed transmission leak around seal at cv axle and took it to ford dealership to have it checked out and they said it was the cv axle bushing that was causing the leak but they did not say they had a recall on it
2009 Mercury Mariner - 4WD 48,500 mi,
Trans oil was low oil in drive waiting on parts 2009 out of warenty
2009 Mercury Mariner - 2WD 72,000 mi,
Car started slipping in gears on take off and i checked fluid and it was low. I took it to a transmission shop and he said i am losing fluid on the left side shaft area. I just bought my Mariner in November of 2011 it was a lease turn in. I love it but i cant believe i am having mechanical problems already.
2010 Mercury Mariner 40,172 mi,
bought car used, put a total of 400 miles on in 5 months, last oil change 5 weeks ago, noticed oil on garage floor, mechanic said it was a possible transmission axle seal leak, what a freakin bummer, dont want the car now.
2009 Mercury Mariner - 4WD 24,299 mi,
Noticed fluid dripping. Discovered where axile drive shaft slides into differential. Calling Ford dealer to get repaired had 6 year warranty maybe close running out of warranty.
2009 Mercury Mariner - 2WD 80,000 mi,
I have the same problem. Axle shaft seal leaking left front side. Alot of play.
2009 Mercury Mariner - 2WD 74,900 mi,
Purchased car used from a local Ford dealership and the next day my mechanic noticed the axle seal leaking. Ford dealership confirmed they had just replaced it 200 miles earlier, but in the meantime (1/26/12) Ford issued a service bulletin on this and Ford paid for a proper repair (basically a new left axle). If you've already paid for this repair it might be worth asking Ford for a refund as they've recognized it as vehicle flaw in the manufacturing. Good luck to all!
2009 Mercury Mariner - 2WD 49,000 mi,
transmission fluid leaking from the axle seal on the left side--replaced axle seal but said it was not covered by the drivetran warranty
2009 Mercury Mariner - 2WD 18,000 mi,
The dealer says the parts are on back order.
2009 Mercury Mariner - 4WD 15,000 mi,
Transmission oil leaks from left front transmission area. Have replaced seals twice and most recently the left axle. Fingers crossed.