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2012 Kia Optima SX K5
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Discussion Starter · #1 ·
I have been battling with my kia optima for a few months already, I am unable to figure out what's the issue. I got a state ref and i need everything back to stock which I already did.
I have replaced the catalytic converter and the 02 sensor already but that didn't help. any suggestions or sensors I can change, I'm stressed about this and unable to figure it out.
My last option was to take it to the dealership and have them check the whole car to see what is wrong with it.

its throwing me

02 Bank 1 Sensor 2
test incomplete or dependent test failed

Catalyst Monitor Bank 1
test incomplete or dependent test failed

most recent code i got was
U0164 Data bus: NC control module - no communication.

2012 Kia Optima SX

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