Where is the oxygen sensor on a 2005 dodge diesel truck?

The location of the oxygen sensor (O2 sensor) on a 2005 Dodge diesel truck depends on the specific engine. Diesel engines don't rely on O2 sensors in the same way gasoline engines do. They generally don't use them to control the air/fuel ratio in the same way.

Therefore, a 2005 Dodge diesel truck likely does *not* have an O2 sensor in the exhaust system like a gasoline engine would. It's possible there's a sensor monitoring exhaust gas for emissions purposes, but it wouldn't be a traditional O2 sensor. If you're looking for a specific sensor, you'll need to consult your vehicle's repair manual or a parts diagram with your VIN for its exact location and type.