is it the same thing? can I swap them?

 

i tihnk you can , but im not toally ure.

 

Primary actually does all the work, all the secondary does is relay the signal to the ECU.

 

but are the sensors thme sleves the same? ill check when i get a chance, i have both my sensors out at the moment , ill check the part numbers, i tihnk the second only does that job becuase where its hooked into the ecu , i could be wronh though

 

I believe they are the same internally, but the wires on the secondary are longer.

 

You can switch them, but if you go to Acura to buy one they will ask you if you want the primary or secondary. The primary sends info to the ecu to help tune the a/f ratio. The secondary is purely for emissions.
gmoore