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What is the consenus on 2006.5 Optima?
Would you want your kids or friends buy it?

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Have the LX I4.
We had an issue with the passenger air bag indicator that would come on intermittently, which took about 4 months to remedy.
It's sort of similar to when you upload songs from your computer to your iPod, or things similar.
That ECU is controlling or responsible for more of a modern car's functions than ever before such as idle, fuel/air mixture, transmission shift points (automatic), electronic stability control, climate control, etc.