2000 check engine codes

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 dont 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?

 

Experience with a Subaru that had the same "kind" of codes/errors...

Check your sensors on the block (and if the intake manifold has one) for temperature. Make sure the pick-ups are clean and not moist. This can cause a closed circuit while other sensors are open circuit - this is kinda like your ECU getting two temperatures that are exactly the opposite when they should be close to each other in range...

Also, for good measure, I would flush your coolant if it hasn't been flushed in the past year...

Hope these help!

 

But I'm confused as to the different explanation of the codes from Auto Zone and the manual.

 

If they had input incorrect ECU/year/model/engine that would explain it...

 

Probably best to get a 2nd opinion.

 

Good call. You could just go to another AutoZone...

That would save you a dime, but you may get miss diagnosed again. Personally, I would take it to a trusted mechanic, or ask if anyone has an OBD Reader.

 

Got a 2nd opinion, basically said the same thing.

Tried to remove the temp sensor to test it but was unable to get a socket on it. It's in such a bad place and the socket wouldn't clear the block.

Might have to actually pay someone to do it.