The 2021 BMW I3S has 21 suspension parts with verified fitment on this page — 5 part types and 11 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 suspension system controls ride, tire contact and alignment through shocks, struts, control arms, bushings and links. 17 parts of the 21 listed are Control Arm (7 parts), Sway Bar Link (6 parts) and Ride Height Sensor (4 parts). The other 2 part types cover the remaining 4 parts.
The 2021 BMW I3S was sold with both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. All 21 parts on this page fit every engine.
The most listed brands for 2021 BMW I3S suspension parts are DORMAN (4 parts), SACHS (3 parts) and DELPHI (2 parts), plus 8 more brands. Quality grades include Daily Driver and Economy.
4 parts on this 2021 BMW I3S page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including DELPHI TC4478 (Control Arm) and MOOG K750851 (Sway Bar Link). Click any part number to see every vehicle that part fits.
Control Arm
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DELPHI Popular Fits: all 2021 I3S engines | TC4478 | 🇺🇸 US 🇨🇦 CA | Complete Arm with Ball Joint | View on Amazon |
| SUSPENSIA Popular Fits: all 2021 I3S engines | X05CJ7358 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Complete Arm with Ball Joint | View on Amazon |
| DELPHI Fits: all 2021 I3S engines | TC4479 | 🇺🇸 US 🇨🇦 CA | Complete Arm with Ball Joint | View on Amazon |
| DORMAN Fits: all 2021 I3S engines | 526687 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Complete Arm with Ball Joint | View on Amazon |
| DORMAN Fits: all 2021 I3S engines | 526688 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Complete Arm with Ball Joint | View on Amazon |
| MEVOTECH Fits: all 2021 I3S engines | CMS101608 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SupremeComplete Arm with Ball Joint | View on Amazon |
| MEVOTECH Fits: all 2021 I3S engines | CMS101609 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SupremeComplete Arm with Ball Joint | View on Amazon |
This table covers the control arms that locate each hub relative to the chassis. Typical signs include clunks over bumps, a wander on the highway, or inner-edge tire wear. Get an alignment after any control-arm work, and inspect the ball joint and bushings that came with the arm.
7 Control Arm parts for the 2021 BMW I3S come from 4 brands — DELPHI, DORMAN, MEVOTECH and 1 other brand. The "Popular" part is DELPHI TC4478. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
Listed part numbers: DELPHI TC4478, SUSPENSIA X05CJ7358 and DELPHI TC4479, plus the other parts above.
Control Arm Nut
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN Fits: all 2021 I3S engines | HWN0119 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Lower Outer16x1.5mm | View on Amazon |
This table covers the Control Arm nuts.
One part is listed for the 2021 BMW I3S — REIN HWN0119.
Ride Height Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARNOTT Fits: all 2021 I3S engines | RH4387 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | RearTo 12/20 | View on Amazon |
| ARNOTT Fits: all 2021 I3S engines | RH3718 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Front | View on Amazon |
| FCS Fits: all 2021 I3S engines | HS008 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits Rear | View on Amazon |
| MONROE Fits: all 2021 I3S engines | HS10203 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Frontwith Air Suspension | View on Amazon |
This table covers the Ride Height sensors. 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 Ride Height Sensor parts for the 2021 BMW I3S come from 3 brands — ARNOTT, FCS and MONROE. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
Part numbers include ARNOTT RH4387, ARNOTT RH3718 and FCS HS008, among others listed above.
Shock / Strut Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SACHS Fits: all 2021 I3S engines | 803245 | 🇺🇸 US 🇨🇦 CA | Rear Left | View on Amazon |
| SACHS Fits: all 2021 I3S engines | 803246 | 🇺🇸 US 🇨🇦 CA | Rear Right | View on Amazon |
| SACHS Fits: all 2021 I3S engines | 803300 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
This table covers the upper mounts (and bearings) a strut bolts through at the tower. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
SACHS supplies the 3 Shock / Strut Mount parts for the 2021 BMW I3S. All of them fit every engine offered in the 2021 I3S.
Part numbers include SACHS 803245, SACHS 803246 and SACHS 803300.
Sway Bar Link
Daily Driver
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOOG Popular Fits: all 2021 I3S engines | K750851 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left | View on Amazon |
| MOOG Popular Fits: all 2021 I3S engines | K750852 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| DORMAN Fits: all 2021 I3S engines | 541805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left | View on Amazon |
| DORMAN Fits: all 2021 I3S engines | 541806 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: all 2021 I3S engines | 1018346 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front LeftEND LINK | View on Amazon |
| BECK/ARNLEY Fits: all 2021 I3S engines | 1018347 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
This table covers the links that connect the anti-roll bar to each control arm or strut. Typical signs include a clunk on one wheel over a driveway, or a rattle that goes away when you lean on the bar. Replace links in pairs; a seized stud often takes the bushing with it.
6 Sway Bar Link parts for the 2021 BMW I3S come from 3 brands — MOOG, DORMAN and BECK/ARNLEY. The "Popular" part is MOOG K750851. Every part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
In the Daily Driver grade, MOOG and DORMAN supply 4 parts: grouped for everyday commuting duty. A representative part number is MOOG K750851.
The Economy section lists 2 options from BECK/ARNLEY — the catalog's value-priced group. BECK/ARNLEY 1018346 is listed in this group.
Part numbers include MOOG K750851, MOOG K750852 and DORMAN 541805, among others listed above.
Buying Suspension Parts for a 2021 BMW I3S
On this vehicle, the suspension system controls ride, tire contact and alignment through shocks, struts, control arms, bushings and links.
- You do not need to pick an engine: every suspension part on this page fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace shocks and struts in axle pairs, renew the sway-bar links with the struts, and get an alignment after any control-arm or tie-rod work.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Control Arm and Sway Bar Link .
Frequently Asked Questions
How many suspension parts fit the 2021 BMW I3S?
Our catalog currently lists 21 suspension parts for the 2021 BMW I3S across 5 subcategories and 11 brands, covering both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Each part is matched to the engine(s) it fits.
Do suspension parts differ between 2021 BMW I3S engines?
No. On this page every suspension part fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of suspension problems on a 2021 BMW I3S?
Common symptoms include clunks over speed bumps, wandering steering, cupped tire wear, or a nose that keeps bouncing after a dip. 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 shocks and struts in axle pairs, renew the sway-bar links with the struts, and get an alignment after any control-arm or tie-rod work.
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?
Every part on this page already fits both the 647cc L2 ELECTRIC and the 647cc L2 ELECTRIC/GAS. Then worn bushings often mimic bad shocks — inspect before buying, and remember loaded vs unloaded strut assemblies differ in labor by hours. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW I3S
Suspension 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.