I tried to search this but its an odd thing to search for to get the answer Im looking for.Im just about to drop the motor in for a final time and I realised that I only had the driver side o2 sensor.I deleted the rear o2s on my harness and thought both stock manifolds had the o2 sensors still in them.Im realised that there isnt one on the passenger side manifold.I dont see where it would be mounted either so I want to confirm that does the front passenger manifold have an o2 bung or was it in the stock y pipe on a 2000 camaro?Im using what should be stock fbody 2000 ls1 manifolds.I dont see in any other swaps poeple mentioning having to relocate or fitment issues with o2 sensors using stock manifolds.Can someone please verify..or show me a pic of where I should be looking for the o2 bung on the passenger side.I need to get a new o2 sensor and harness.Or should I delete this from the pcm and just run 1 o2 sensor?

 

You need 2 sensors because the fuel is trimmed for bank 1 & 2 seperately. The stock location for the passenger's side sensor is on the pipe just upstream of the converter.