PO134 is the code. This is what I've found it means by searching

P0134 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)

It shows up as a pending code. What does that mean and how do I fix it? Is it basically saying that my o2 sensors are out?

 

Your check engine light has two different "settings." Once your truck senses a problem it examines the particular problem more thoroughly as to prevent the light coming on often. These pending codes occur without a check engine light as you know, but after a few drive cycles and it confirms your O2 sensor is going out it activates the light and turns into a "Trouble Code." This is where it gets especially annoying, because on start-up it does two annoying beeps, the "pending" and "trouble" code warnings.

 

Okay so I know what to expect and how it works. How about solving this? Should I replace all o2 sensors?

 

Maybe checked connections first... see attached, that code is from continuity test performed by the ECU.

 

My Ultra Gauge threw me a P0420 "pending" code the other day. I just ignored it. All four o2's are brand new along with new catalytic converters. Not sure why the alarm went off. But its been fine since.

Unless it logs as a check enginr light dont sweat it. Sometimes the Ultra Gauge does more than good.

 

Before you replace anything watch your O2's on the U-G and see what they are doing.
The supposed dead one will just sit at one voltage or move around very slowly.

I have all alarms turned off, with them on the thing sounds like the cockpit of a fighter jet thats about to slam into a mountain.

 

Put some dielectric grease on the connectors. Make sure they are connected tight. Also clean them off. If this doesn't solve your problem, get new 02s. I just went through this about a month ago. I kept getting the same code and then the engine starting running a little rough. Once replaced, everything was back to running smooth and I got better gas mileage. Replace the pair if you do end replacing them.

 

I would agree with james and spike here could be dirty connection and if dead your ug will provide the info if you monitor you o2 sensors. The ug does not just beep for no reason it beeps to notify you of a problem and that is the reason you bought it right? When it reports a problem you simply go to the search bar at top of page and type in the code. 1 look 2 read 3 learn 4 make necessary repairs clear code and move on.