P0125 Code - LX470

[RPMOffroad]

I installed new Magnaflow replacement cats today on both sides and also added a borla cat back exhaust and now I'm getting a P0125 code which I didn't have an issue with before. I did a search on here and some say it was related to the coolant sensor then some say related to the upstream front O2 sensors.

Its a 2000 LX470 with 120K on it. Could the new cats and higher flow exhaust affect the o2 sensors? do they need to be replaced now?

Thanks

 

[BillZ260]

Ever figure this out?

 

[badlander]

I had the same code on my LC. I found the same confusing info while researching it. In our case, though, it is the coolant sensor at fault, not the oxygen sensor. I removed the plug from the coolant sensor and cleaned the terminals on the sensor and in the plug best I could and that solved it. The code has not returned.
FYI, O2 sensor codes for LX and LC are 0130 thru 0167.

 

[BillZ260]

Thanks I'll get to it this weekend and confirm

 

[85x]

I'm curious how this turned out for you. I have a P0125 code and replaced the temp sensor and it came back. Did replacing the upstream O2 sensor resolve it?