Genuine BMW Engine Wiring Harness - Z3 M with S54 - 12517831637

The ideal harness for S54 engine swaps in older BMWs as it doesn't have drive-by-wire and is longer for more ECU mounting options

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This part is listed by BMW as BMW part number 12517831637 (12-51-7-831-637) and is described as Genuine BMW Engine Wiring Harness for the 2001-2002 Z3 M Roadster and M Coupe with the S54 engine. 

This engine wiring harness is for the later S54 engine MZ3 models, as found in the 2001 and 2002 model year. This is the 315hp engine (and NOT the earlier 240hp engine variant). 

This is a Genuine BMW replacement harness, used to replace or repair a damaged engine wiring loom on an MZ3 S54. It's also a popular item for installing an S54 engine in an older model BMW, as the wiring does not include drive-by-wire throttle wiring, making it a more ideal starting point for cars that will use a traditional throttle cable. 

The Z3 M wiring harnesses for S54 are getting harder and harder to find, and when you do find one, you're harvesting one that has a couple decades of age and wear. This is a brand new Genuine BMW S54 wiring harness, perfect for doing a clean and proper S54 swap on an E30, E36, or other classic BMW chassis. The Z3M harness is actually longer, which allows the ECU to be installed in the glovebox or other desired area on the earlier cars like E30 and E36. This is another upside to the MZ3 harness for swaps over the standard E46 M3 harness. 

For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.

BMW Fitments:

Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 M - S54
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