BMW i3 Engine Wiring Loom Replacement Parts

The BMW i3 is a fully electric vehicle (BEV) or a range-extender electric vehicle (REx), and it does not have a conventional combustion engine wiring loom in the traditional sense. What it does have is a high-voltage battery and electric motor wiring harness, plus a separate 12V low-voltage loom — these are fundamentally different components from the engine wiring loom you would find on a petrol or diesel car. If you are searching for wiring components on the i3, you likely need either the high-voltage motor harness, the 12V auxiliary wiring loom, or the REx two-cylinder petrol generator wiring harness (if your car is the range-extender variant). Confirm exactly which harness you need with the breaker by providing your registration and VIN.

The i3 REx (Range Extender) does carry a small two-cylinder petrol generator, and that unit will have its own dedicated wiring harness connecting it to the car's systems — this is the closest thing to an 'engine wiring loom' on any i3 variant. However, this harness is specific to the REx and is not present on the standard battery-electric i3 at all, so you must confirm with the breaker that the donor car is also a REx model. The REx generator harness is likely paired to the vehicle's ECU and immobiliser system, so confirm with the breaker whether coding or ECU matching will be required before purchasing. Always supply your full VIN and registration when asking for a quote.

The BMW i3 ran from 2013 through to 2022 in the UK, with a mid-cycle update arriving around 2017–2018 that introduced the 120Ah battery alongside electrical and ancillary revisions. Whether a loom from a pre-2017 car crosses over to a post-2017 car is not something that can be confirmed without checking the specific part numbers, and you should route this question directly to the breaker quoting against your registration. For the REx harness in particular, any changes in generator specification or battery management software between production years make cross-generation fitment uncertain. Give the breaker your VIN so they can compare donor and recipient cars properly.

Trim level — whether your i3 is in base, Suite, Loft, Lodge, or any other interior specification — has no bearing on the electric motor harness or REx generator harness fitment whatsoever. What matters is whether your car is the standard BEV or the REx variant, the battery generation (60Ah or 94Ah/120Ah), and the model year. You may find trim differences in comfort or infotainment wiring elsewhere in the car, but the drivetrain-related harness follows the powertrain specification, not the interior package.

The most important details are your full VIN (available on your V5C or via a VIN check), your registration plate, and confirmation of whether your car is the standard BEV or the REx range-extender model. You should also tell the breaker your battery generation if you know it — early cars used a 60Ah pack, later ones 94Ah and then 120Ah — as electrical architecture can differ between these. Because wiring harnesses on electric vehicles are frequently paired to the car's ECU and battery management system, confirm with the breaker whether any coding or programming will be needed after fitting.