Hello, we are in the process of swapping and 04 engine into my 03 car. Everything has been pretty straightforward but when we were hooking up the wiring harness, the 02 sensors are different. The 04 engine has a wide and connection and the 03 harness has narrownband. What is the next step? Do I need to transfer over the wire harnesses as well or is there an easier way to do it?
The car that is receiving the engine is running the Haltech platinum pro. Any advice would be great as we can't move forward until we figure out what to do.
Help help help!

 

Try and put wideband o2s in it

 

03 Infiniti's came from the factory with wide band 02 sensors.

 

Not til 05. 03/4 had NB 02 sensors, but if OPs car is pre 03.5 he has a different ECU.

This is why early 03 models can't be etuned unless you do a WB swap. The 03.5 and 04 models still have NB sensors, but A/F can still be displayed via the ECU. I'm assuming the connections would have to be different to achieve this, so yeah, you'll probably have to swap harnesses and maybe the ECU.

Seymour4, correct me, and explain it better. Haha