I did a motor swap on a 2005 350z non rev up, put a 03 motor with 03 harness with the 05 ECU. Found out I can’t use the 03 ECU due to the upstream o2s being different. My 05 engine harness is missing a downstream oxygen sensor is there anyway around this? I tried to put the 03 ECU In the 05 car and the immobilizer comes on... don’t know what to do from here but buy another harness?

 

what do you mean it's missing downstream O2 sensors? is it missing a sub-harness?

 

No, here’s another picture it’s missing the actual other side of the o2 sensor in the wiring harness that goes down along the transmisson


in in the first picture u can see bank 1 and bank 2 connector
second picture has only bank 1 I’m assuming somebody ripped the other side off for some reason

 

do you mean the passenger side or driver side? or the sensor connector? did it get cut off?

Can you take a good picture of the entire harness?

 

Not sure how it happened and not sure what side I just know it’s missing one downstream sensor so there’s nothing to plug in bank 2

 

It probably got clipped off ... look for 4 bare wires in that area, it'll be right near the one still in-tact.

I have a few of those pig-tails if you need a replacement. Shoot me a message.

 

Heres a better look I think the gray connecter is the other side but it’s broken Any ideas for repairs

 

you need to de-pin & repin to a good connector or splice in a good connector.

I have a bunch of those if you need one -