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2012 Kia Optima
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418 Posts
I had the same issue it's more than likely the pins on the bulbs are not making proper contact. Just gotta bend the pins on the bulbs
 

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Your K5 Optima Vendor
2017 Tesla Model X
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28,260 Posts
I had the same issue it's more than likely the pins on the bulbs are not making proper contact. Just gotta bend the pins on the bulbs
If that were the case though, the OEM bulbs would still work. Sounds like a fuse may have blown. (Even though I know the OP checked them already)
 

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2011 Kia Optima
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1,637 Posts
I would leave the OEM bulbs in for now and if now still having trouble and the fuse is good (i'd replace that too), go back to dealer.
 

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248 Posts
Does this optima have a reverse camera? Is it still working? Reason I ask is because the radio also turns on the reverse camera by the same +12 signal the reverse lights get. Here is a diagram of the reverse light circuit. Hope this helps.

backup_lamps.jpg
 
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