P0125 Code

Hi, I’m currently chasing a P0125 code in my ‘99 3.4. I’ve recently had the air compressor replaced and it wasn’t throwing a code before that, and I’m unsure what would be the cause of the issue. Light wasn’t on when I started the truck, I let it run for about 20 minutes then started driving and it was on. I’m trying to narrow the issue down a bit before I start replacing everything that could possibly be causing it.

 

Where does your temp gauge sit after warmup?

 

https://www.engine-codes.com/p0125_toyota.html

 

P0125 has nothing to do with coolant temp being too low on these...

It means the AFR/O2 sensor isn't responding properly.

 

If you look up the generic description for P0125 yes but Toyota uses P0125 for an AFR/O2 sensor fault on 1st gens.
Right from the FSM

 

Im sure you know a lot more than myself. I was just quoting as you say the generic description. I will delete my post. I don’t want to mislead anyone.

 

No worries, Toyota is the only manufacturer I know of that doesn't follow the SAE standard for codes P0125 and P0128 in some cases so it can get confusing.

 

Dang it DM93

pretty sure I posted code causes in another thread lil bit ago (incorrectly!)
Sorry

 

so I assume the fix would just be replace the o2 sensor?

 

I'd recommend checking it first, you said it happened after the A/C compressor was replaced so the first thing I'd be looking for is if any wires got pinched/broken.