2012 Kia Optima, poor MPG
20

Asked by Jomar Aug 02, 2019 at 07:14 AM about the 2012 Kia Optima LX

Question type: Maintenance & Repair

I had an oild change at Walmart a while back
and ever since then my MPG has been below
25 hwy and around 21 city. I used to get up to
28 sometimes, not sure what happened. Now
it turned off on me yesterday while pulling out
of a parking spot. Checked the code it gave
and said that Oxygen Bank 1 Sensor 2 high
voltage. P0138. I feel like this will fix it but I
need to know if this is the upstream piece or
downstream. Both are not cheap and in 2
different locations apparently but no one
knows which one is Bank 1 sensor 2.

2 Answers
1,105

GuruHBY1Q answered 4 years ago

The code is for the downstream sensor. If your fuel economy has dropped, it’s quite possible you may need the upstream as well.

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20

Jomar answered 4 years ago

Thank you, I'll order them both and hopefully it's not too difficult to replace.

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