PO125 CEL Help (1 Viewer)

Joined
Jun 7, 2020
Messages
9
Location
Boston
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.
 
Joined
Aug 30, 2019
Messages
45
Location
Fresno CA
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.
 
Joined
Oct 1, 2014
Messages
377
Location
bozeman MT
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.
 

Users who are viewing this thread

Top Bottom