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Hey all, I'm running a 2007 Kia Spectra 2.0. I recently started getting a check engine light with the code P0170. Googling gives me P0170 Fuel Trim Malfunction (Bank 1) - fuel trim malfunction. It does have a rough idle but has not stalled.
I've gone through everything listed short of changing the O2 sensors. I've checked and cleaned the MAF, all looked good and made no change. I've checked for and vacuum leaks and could find none. I checked the PCV valve and it is functioning *note: I previously attempted to change the valve and the bass female fitting stays attached to the valve and spins in the plastic manifold cover. It is tight however and not leaking. Before I drop the $200+ and change both O2 sensors, has anybody else dealt with this issue or have any suggestions? Thanks in advance!
 

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Discussion Starter #2
I guess we're going to start swapping O2 sensors. Any feedback would still be appreciated, even if it is to verify that I'm on the right track.
 

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In case anybody else lands here with the same issue, here's what my resolution was. The gasket between the intake and the head failed. It was tough to see but could be heard once I got my head back there and poked around. Didn't have the time to pull the intake so we paid a shop $200 to change for us, leak gone, idle back to normal, back on the road.
 
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