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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 05-16-2013, 02:05 PM
Keyon1981 Keyon1981 is offline
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Location: MN
 
Join Date: May 2013
Posts: 2
Mein Auto: 2002 BMW 525i
02 325i to 525i engine swap

So, like I said in the intro, I am swapping out an engine donor>> 02 325i going in a 02 525i. I ran into some wiring probs and I hope someone can help. For starters the 325i has a shorter engine harness than the 525i, and the original 525i harness was a bit damaged. So I decided to splice the entire engine harness to make it long enough. Pretty much all the wires are correctly color coded from the ECM except this other connector that came along with the 525i model. I managed to trace back most of those most did not match each other's color code except 2 of them. I know for sure that one comes off of the back of the fuel rail harness and it looks just like an o2 sensor but its not, they look a like but no the are not compatible. Does anyone know where it goes to or comes from. I can post pictures if you want..
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