Hi guys,
I recently bought a 2003 350z. The previous owner swapped it with a 2004.5 engine and used the newer engine harness with the wideband o2 sensors but kept the 2003 ECU. I'm getting a SES light because of that for the upstream sensors. A tuner I talked to told me that he could "tune" the ECU to act like a 2004.5 ECU. Is that a thing that works? Also, if I swap in the ECU, BCM, and ignition from a 2005 model 350z, would it be plug and play without needing to code in anything? or would it be easier to swap in a newer ECU and recode the NATS/BCM?

 

what would basically be the simplest solution to get the 2004.5 ECU into the car?

 

You can't reprogram an 03 ECU to be a 04.5. Its just not going to work.

Easiest option is to get the correct ECU and flash it with Uprev to delete NATS. Very simple to do.

 

Thanks I will try that. A shop in my area mentioned that they can reset the ECU so it will work without disabling the NATS. Is that a valid option to try?

 

Dealership can program the ECU as well

 

Thanks! Ill check with them as well. But just checking, I can directly swap the ECU without needing to change the BCM or the IPDM or anything correct?

 

Yes. If you want to go the Uprev route shoot me an email

 

Alright! Will do.