Note - there are two types of sensors, those that bolt to the firewall and those that "float" on the feed tubes. The following procedures are based on the floating type, although the procedures are identical save for the need to unbolt the sensors that are secured to the firewall.
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• Disconnect the negative battery cable.
• Locate the DPFE sensor. It is positioned to the left of the brake booster up against the firewall and has two metal tubes running from the EGR valve supply line and into the DPFE sensor. Note that some sensors will "float" above the tubes, while others may actually be fixed to the firewall by (2) bolts.
• Unplug the electrical connector from the DPFE sensor, then remove the sensor. If the inlet hoses are tight, gently move the sensor side-to-side while pulling. Be cautious not to break off the plastic nipples on the sensor.
• Install the new sensor in reverse order, making sure that it is fully seated in the inlet hoses. If desired, you can secure the lines with zip ties or hose clamps.
• Reinstall the negative battery cable, start the truck, and verify everything is functioning properly (i.e. no check engine light, DTCs).