PO125 CEL Help (1 Viewer)

[96FJ80green]

Hey guys! Just picked up my truck from getting a new front cat and the code PO125 just came up. Been reading it can be caused by a faulty 02 sensor but the original one looks fine with all wires intact. I ordered a new denso 234-4157 to install later this week just to be safe. What else should I be trying? Really hoping this isn’t a bigger deal with the cooling system. Thanks in advance.

 

[fresnoLC]

So that code is insufficient temperature, how would that be related to an O2? Is your truck warming up after start? Just going off the code I would look at the temperature sending unit or see if the thermostat is stuck open.

 

[alia176]

Or maybe the coolant temp sender?

 

[secretasiansam]

So that code is insufficient temperature, how would that be related to an O2? Is your truck warming up after start? Just going off the code I would look at the temperature sending unit or see if the thermostat is stuck open.

I had p0125 while running with out o2 sensors while waiting on new exhaust bungs. Gone now with new 02 sensors. Another member just had the same code with a broken 02 sensor wire. He's on the right track looking at 02 sensors with p0125.