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Hi guys and gals. Just purchased a 1998 DX HB d16y7. The guy i bought it off of installed a stock header from an ex due to the original header cracking he connected one 02 sensor and disconnected the other. My question is how do i determine which plug is for the primary and the secondary? i want to be sure it is hooked up correctly when i get the full exhaust system in a couple of days. one plug wire looks longer than the other but was not sure if that was the deciding factor. i will get a pic up of the engine bay asap.
 

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easy way without looking is not plug one in and check the CEL code for which one is unplugged with no 5vt heater source connected
Thats a good way to do it. However in my 98 DX I know the longer one is the downstream O2 sensor. You could arrange them like that to start with then check them as posted above if you have problems.
 
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