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I had that problem. Get a can of white lithium spray grease with the red straw nozzle. Stick straw into where the door check strap inserts into the door. Give top and bottom a squirt. Using your fingers give the check strap itself a light coat. Did that when I bought my car two years ago and the problem hasn't come back.
I had mine done at a dealer, supposedly this tech has heard this complaint quite a bit, I'll assume this is the best way to go about it based on his experiences
I had that problem. Get a can of white lithium spray grease with the red straw nozzle. Stick straw into where the door check strap inserts into the door. Give top and bottom a squirt. Using your fingers give the check strap itself a light coat. Did that when I bought my car two years ago and the problem hasn't come back.
This should do the trick. A five minute job and done. Maybe a ten minute job if you include trying to put that da&n red straw thingy into the nozzle without getting the grease all over everything!!