Truck has been running well until today. it is reasonably cold, may 20 degrees but I doubt this has anything to do with it.
Check engine light came on, went to Auto Zone to have it checked.
Came up with two codes, PO125 AND PO135.
The 125 code says Insufficient coolant temperature for closed loop fuel control.
The 135 code is something like a problem with the coolant sensor. He couldn't print it out cause he broke the printer on that one.
Are the two related?
What does each do? I think I an pretty sure what a coolant sensor is in a older car, probably the same here but what about the 125 code. He said something about a TPS, I think he called it a Temperature Pressure switch or like that.
What could happen if I don't get it fixed right away.
Added INFO: Here's some more info, I checked my Haynes Manual and it says that the PO125 code is : O2 sensor heater circuit fault and for PO135 : Upstream heated 02 sensor heater circuit (high voltage Bank 1, Sensor 1.
It appears that he gave me the wrong info? And is it just the 02 sensor?