P1401 was the code error
how can i test a egr temperature sensor ,to see if it is good or not on 1996 Nissan Altima
there is a procedure but you need a scanner and volt meter to read. temp temp sensor changes values as it heats up and you need to monitor that. i rec you seek a diag and est as to save time and money.sorry
1 more answer
you need a scan tool.