I have a 1998 Dakota SLT V6 automatic. How many oxygen sensors does my truck have? I can only find 1 upstream and 1 downstream on the passenger side. The reason I ask is the NTK website refers to V6 engines as having 2 upstream (1 on each bank) and then 1 downstream. Also the wiring that comes down from the engine to my upstream sensor has a random female connector branching off of it that has nothing connected to it. Anyone know why that is? Thanks in advance guys

 

Difference between Federal, and California Emissions? Federal emissions, assuming that's a 3.9 V-6, you will only have two sensors.