Received a recall for my vehicle. Recall was pd128. Took vehicle to dealer to have recall serviced on vehicle which was for a pm sensor and reprogram the emissions control module. After recall, DEF system error code and reduce speed to 5mph showed up on truck. Went back to dealer to explain issue after the recall. They ran codes and thought it could be the DPF filter or EGR without thinking the recall could be to blame. Went to another mechanic and did a DEF system check and found no issue with system but a miscommunication with the NOx sensor. Had NOx sensor replaced and a week later had same DEF system error come on but was more intermittent and would clear on its own. Checked codes and found said miscommunication with the same NOx sensor that was replaced. Went back to the original dealer to explain the issue and believe it was due to the recall reprogram. They did a diagnostic and spoke with their own techs and said their campaign recall repair revealed a concern that was present before but did not have detection sensor or the logic to determine the issue and recommends DOC/DOF to to replaced. Contacted Nissan about the issue and if replacement would be covered due to it being tied to the recall and was told no that it is just a coincidence even though their campaign revealed there was an issue with the recall.