The 2021 BMW I3 has 11 ignition parts with verified fitment on this page — 3 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 ignition system on the 2021 BMW I3 delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. All 11 listed parts are Ignition Coil (5 parts), Camshaft Position Sensor (3 parts) and Crankshaft Position Sensor (3 parts).
The 2021 BMW I3 was sold with both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
6 brands supply ignition parts for the 2021 BMW I3, led by WALKER PRODUCTS (3 parts), WELLS (3 parts) and HOLSTEIN (2 parts), plus 3 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 BMW I3. 1 part has it: KARLYN / BREMI / STI 20753 (Ignition Coil). Each part number opens a page with every vehicle that part fits.
Camshaft Position Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: 647cc L2 ELECTRIC/GAS | 2CAM0303 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: 647cc L2 ELECTRIC/GAS | 2351285 | 🇺🇸 US 🇨🇦 CA | Sensor OnlyIncludes Seal | View on Amazon |
| WELLS Fits: 647cc L2 ELECTRIC/GAS | 5S16165 | 🇺🇸 US 🇨🇦 CA | Mounting Bracket Included: No | View on Amazon |
This table covers the sensors that report camshaft position to the ECU. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
3 Camshaft Position Sensor parts for the 2021 BMW I3 come from 3 brands — HOLSTEIN, WALKER PRODUCTS and WELLS.
The Economy section lists 1 option from HOLSTEIN — the catalog's value-priced group. HOLSTEIN 2CAM0303 is listed in this group.
In the Standard Replacement grade, WALKER PRODUCTS and WELLS supply 2 parts: built to original-equipment specification. A representative part number is WALKER PRODUCTS 2351285.
Listed part numbers: HOLSTEIN 2CAM0303, WALKER PRODUCTS 2351285 and WELLS 5S16165.
Crankshaft Position Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: 647cc L2 ELECTRIC/GAS | 2CRK0712 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: 647cc L2 ELECTRIC/GAS | 2352068 | 🇺🇸 US 🇨🇦 CA | Sensor Only | View on Amazon |
| WELLS Fits: 647cc L2 ELECTRIC/GAS | 5S16172 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
3 Crankshaft Position Sensor parts for the 2021 BMW I3 come from 3 brands — HOLSTEIN, WALKER PRODUCTS and WELLS.
The Economy section: 1 option from HOLSTEIN. HOLSTEIN 2CRK0712 is listed in this group.
Standard Replacement: 2 parts, from WALKER PRODUCTS and WELLS. A representative part number is WALKER PRODUCTS 2352068.
Listed part numbers: HOLSTEIN 2CRK0712, WALKER PRODUCTS 2352068 and WELLS 5S16172.
Ignition Coil
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRENCO Fits: 647cc L2 ELECTRIC/GAS | 368306 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KARLYN / BREMI / STI Popular Fits: 647cc L2 ELECTRIC/GAS | 20753 | 🇺🇸 US 🇨🇦 CA | Bremi-STI Direct Ignition Coil Unit | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 647cc L2 ELECTRIC/GAS | UF757 | 🇺🇸 US 🇨🇦 CA | 2 Cylinder. | View on Amazon |
| WALKER PRODUCTS Fits: 647cc L2 ELECTRIC/GAS | 9212301 | 🇺🇸 US 🇨🇦 CA | Single Coil | View on Amazon |
| WELLS Fits: 647cc L2 ELECTRIC/GAS | 5C2116 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off.
5 Ignition Coil parts for the 2021 BMW I3 come from 5 brands — PRENCO, KARLYN / BREMI / STI, STANDARD MOTOR PRODUCTS and 2 other brands. The "Popular" part is KARLYN / BREMI / STI 20753.
The Economy section: 1 option from PRENCO. PRENCO 368306 is listed in this group.
Standard Replacement: 4 parts, from KARLYN / BREMI / STI, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 1 other brand. A representative part number is KARLYN / BREMI / STI 20753.
Part numbers include KARLYN / BREMI / STI 20753, PRENCO 368306 and STANDARD MOTOR PRODUCTS UF757, among others listed above.
Buying Ignition Parts for a 2021 BMW I3
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Match the engine first. Every ignition part here is 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, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Ignition Coil and Camshaft Position Sensor .
Frequently Asked Questions
How many ignition parts fit the 2021 BMW I3?
Our catalog currently lists 11 ignition parts for the 2021 BMW I3 across 3 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 ignition parts differ between 2021 BMW I3 engines?
Yes. Every ignition part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. 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 ignition problems on a 2021 BMW I3?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. 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, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
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 gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW I3
Ignition Parts for Other BMW I3 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.