The 2021 BMW I3S 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.
On the 2021 BMW I3S, the ignition system 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 I3S 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.
The most listed brands for 2021 BMW I3S ignition parts are WALKER PRODUCTS (3 parts), WELLS (3 parts) and HOLSTEIN (2 parts), plus 3 more brands. Quality grades include Standard Replacement, Economy and Premium.
1 part on this 2021 BMW I3S page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — KARLYN / BREMI / STI 20753 (Ignition Coil). Click any part number to see 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 are listed for the 2021 BMW I3S, from HOLSTEIN, WALKER PRODUCTS and WELLS.
In the Economy grade, HOLSTEIN supplies 1 part: the catalog's value-priced group. A representative part number is HOLSTEIN 2CAM0303.
The Standard Replacement section lists 2 options from WALKER PRODUCTS and WELLS — built to original-equipment specification. WALKER PRODUCTS 2351285 is listed in this group.
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 are listed for the 2021 BMW I3S, from HOLSTEIN, WALKER PRODUCTS and WELLS.
Economy: 1 part, from HOLSTEIN. A representative part number is HOLSTEIN 2CRK0712.
The Standard Replacement section: 2 options from WALKER PRODUCTS and WELLS. WALKER PRODUCTS 2352068 is listed in this group.
This group includes HOLSTEIN 2CRK0712, WALKER PRODUCTS 2352068 and WELLS 5S16172.
Ignition Coil
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DELPHI Fits: 647cc L2 ELECTRIC/GAS | GN10885 | 🇺🇸 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 are listed for the 2021 BMW I3S, from DELPHI, KARLYN / BREMI / STI, STANDARD MOTOR PRODUCTS and 2 other brands. KARLYN / BREMI / STI 20753 carries the "Popular" badge.
The Premium section lists 1 option from DELPHI — a step above OE specification in materials, tolerances or warranty terms. DELPHI GN10885 is listed in this group.
The Standard Replacement section: 4 options from KARLYN / BREMI / STI, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 1 other brand. KARLYN / BREMI / STI 20753 is listed in this group.
Listed part numbers: KARLYN / BREMI / STI 20753, DELPHI GN10885 and STANDARD MOTOR PRODUCTS UF757, plus the other parts above.
Buying Ignition Parts for a 2021 BMW I3S
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 I3S?
Our catalog currently lists 11 ignition parts for the 2021 BMW I3S 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 I3S 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 I3S?
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 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 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 I3S
Ignition Parts for Other BMW I3S Years
Switch vehicle or jump to a subcategory
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.