The 2021 BMW I3S has 8 electrical parts with verified fitment on this page — 4 part types and 6 brands, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each part includes a manufacturer part number and application notes.
The electrical system on the 2021 BMW I3S covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. The largest groups are Parking Aid Sensor (4 parts), Battery (2 parts) and Battery Cable (1 part). The other 1 part type covers the remaining 1 part.
The 2021 BMW I3S was sold with both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. 7 parts fit every engine; the other 1 is engine-specific. Each part shows which engine(s) it fits.
6 brands supply electrical parts for the 2021 BMW I3S, led by DEKA (2 parts), MARELLI (2 parts) and ELRING (1 part), plus 3 more brands.
Each part number listed for the 2021 BMW I3S opens a page with every vehicle that part fits.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Fits: all 2021 I3S engines | 9A153R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| DEKA Fits: all 2021 I3S engines | AUX18L | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
DEKA supplies both parts for the 2021 BMW I3S. All of them fit every engine offered in the 2021 I3S.
Listed part numbers: DEKA 9A153R and DEKA AUX18L.
Battery Cable
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: all 2021 I3S engines | 004471 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Battery Fuse Block Cable | View on Amazon |
This table covers the positive and ground cables that run from the battery. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early.
This group shows a single part: ELRING 004471.
Lighting Control Module (LCM)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MARELLI Fits: 647cc L2 ELECTRIC/GAS | LRE703 | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
This table covers the modules that control the exterior lighting.
This group shows a single part: MARELLI LRE703.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2021 I3S engines | 684134 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Black | View on Amazon |
| HELLA Fits: all 2021 I3S engines | 358141781 | 🇺🇸 US 🇨🇦 CA | 3-Pin ConnectorPlugged | View on Amazon |
| MARELLI Fits: all 2021 I3S engines | SDP107 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
| TECHPRO Fits: all 2021 I3S engines | BM1075100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Customer Paints to Match | View on Amazon |
This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
4 Parking Aid Sensor parts for the 2021 BMW I3S come from 4 brands — DORMAN, HELLA, MARELLI and 1 other brand. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
Part numbers include DORMAN 684134, HELLA 358141781 and MARELLI SDP107, among others listed above.
Buying Electrical Parts for a 2021 BMW I3S
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Match the engine first. Some electrical parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Parking Aid Sensor and Battery .
Frequently Asked Questions
How many electrical parts fit the 2021 BMW I3S?
Our catalog currently lists 8 electrical parts for the 2021 BMW I3S across 4 subcategories and 6 brands, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2021 BMW I3S engines?
Some do. 7 parts fit every engine; the other 1 is engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical problems on a 2021 BMW I3S?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 BMW I3S was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 BMW I3S?
First match the engine — each row shows which engine(s) the part fits. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW I3S
Electrical Parts for Other BMW I3S Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.