One main problem is installation, dealer will always do a good professional job that looks like factory job. I have some neat backup sensor I bought online 6 months ago, it is still sitting on the shelf. I saved hundreds $ by buying it online, but I am just too lazy to get someone to install it, actually I made 2 appointments but had to cancel, just not important enough. So maybe I didn't save the money, because a cheap part sitting on the shelf is money wasted.
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