12 Electrical parts are listed for the 2021 BMW I3, in 5 part types, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 BMW I3, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. Most of the listed parts are Parking Aid Sensor (7 parts), Parking Aid Sensor Bracket (2 parts) and Battery (1 part). The other 2 part types cover the remaining 2 parts.
The 2021 BMW I3 was sold with both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. 11 parts fit every engine; the other 1 is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 BMW I3 electrical parts are MARELLI (5 parts), TECHPRO (2 parts) and DEKA (1 part), plus 4 more brands.
2 parts on this 2021 BMW I3 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including DORMAN 684134 (Parking Aid Sensor) and STANDARD MOTOR PRODUCTS PPS120 (Parking Aid Sensor). Click any part number to see every vehicle that part fits.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Fits: all 2021 I3 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.
This group shows a single part: DEKA AUX18L.
Battery Cable
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: all 2021 I3 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.
One part is listed for the 2021 BMW I3 — 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.
One part is listed for the 2021 BMW I3 — MARELLI LRE703.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Popular Fits: all 2021 I3 engines | 684134 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Black | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular Fits: all 2021 I3 engines | PPS120 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Black | View on Amazon |
| HELLA Fits: all 2021 I3 engines | 358141781 | 🇺🇸 US 🇨🇦 CA | 3-Pin ConnectorPlugged | View on Amazon |
| MARELLI Fits: all 2021 I3 engines | SDP056 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
| MARELLI Fits: all 2021 I3 engines | SDP107 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearFrom 09/2014 | View on Amazon |
| MARELLI Fits: all 2021 I3 engines | SDP108 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Right | View on Amazon |
| MARELLI Fits: all 2021 I3 engines | SDP125 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Right | 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.
7 Parking Aid Sensor parts are listed for the 2021 BMW I3, from MARELLI, DORMAN, STANDARD MOTOR PRODUCTS and 1 other brand. DORMAN 684134 carries the "Popular" badge. All of them fit every engine offered in the 2021 I3.
Listed part numbers: DORMAN 684134, STANDARD MOTOR PRODUCTS PPS120 and HELLA 358141781, plus the other parts above.
Parking Aid Sensor Bracket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TECHPRO Fits: all 2021 I3 engines | BM1076102 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left | View on Amazon |
| TECHPRO Fits: all 2021 I3 engines | BM1077102 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
This table covers the brackets that mount the Parking Aid Sensor. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners.
TECHPRO supplies both parts for the 2021 BMW I3. All of them fit every engine offered in the 2021 I3.
This group includes TECHPRO BM1076102 and TECHPRO BM1077102.
Buying Electrical Parts for a 2021 BMW I3
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 Parking Aid Sensor Bracket .
Frequently Asked Questions
How many electrical parts fit the 2021 BMW I3?
Our catalog currently lists 12 electrical parts for the 2021 BMW I3 across 5 subcategories and 7 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 I3 engines?
Some do. 11 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 I3?
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 I3 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 I3?
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 I3
Electrical Parts for Other BMW I3 Years
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