I pull a 11000 lb 5th wheel with my V10, and while pulling home this past weekend, the "Service Engine Soon" light came on. While idling the engine seems to idle rough but seems to smooth out once I give it more gas.

I hooked up and recieved three codes, all the same mentioning the O2 Heated Sensor.

What is the O2 heated sensor and how do I replace it?

I did not think to write down the code numbers, but will get those and repost tomorrow.

 

There should be an O2 sensor on each bank of the Y-pipe. It will be right where the Y-pipe meets each exhaust manifold. It looks like a spark plug with a wires coming out of it. It could be one of them came unplugged. First check that this did not happen. If that looks good then post the codes when you get them. The code will help determine if it's really an O2 sensor that went bad or not and if so which one.
If one needs changed it's not that hard but you'll need a special socket that you can get from any parts store (looks like a normal socket but with a slot cut into it to slip the wire through). After the it's a simple unplug the old one, remove it with the socket, install the new one with the socket and plug it back it.

 

Post the codes!

 

Sorry folks. I have been out of town, and hadn't had time to get the exact codes until today.

I have three codes.

P0135 - Upstream heated O2 sensor heater circuit fault (Bank 1)
P0141 - Downstream heated O2 sensor heater circuit fault (Bank 1)
P0155 - Upstream heated O2 sensor heater circuit fault (Bank 2)

I know this seems obvious, but isn't it weird that both the Upstream (Front) and DownstreaM (Back) O2 sensors would start having issues at the same time?

Could this be a sign of something else, like a clogged catalytic convertor or something else emissions related going on?

thanks in advance for all of your help..