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Delphi TC4478 Suspension Control Arm and Ball Joint Assembly - Front Left Lower
| Brand | Delphi TC4478 |
|---|---|
| Position | Front Left Lower |
| Fits | BMW · 12 vehicles |
OE expertise. Applied to the aftermarket steering portfolio for OE performance.
Extreme testing. Withstands temperatures below -40°C and over 120°C, plus 720 hours of salt spray.
Dimensional analysis. Helps ensure compatibility between the OE and aftermarket part.
Cross-references Dorman - OE Solutions 526-687, Mevotech Supreme CMS101608 and Suspensia X05CJ7359 for the same application. See all 5.
Front Left Lower Control Arm for BMW i3
Delphi TC4478 is a front left lower suspension control arm and ball joint assembly for select BMW i3 and BMW i3s models. It is built for direct replacement use on the front left lower position, with OE-focused dimensional and material analysis to support proper fit and suspension geometry.
Key Features
- Front left lower suspension control arm and ball joint assembly
- Fits 2014-2021 BMW i3, front left lower
- Fits 2018-2021 BMW i3s, front left lower
- OE-based engineering for aftermarket replacement fitment
- Tested for temperature extremes below -40°C and above 120°C
- Exposed to 720 hours of salt spray during validation testing
- Delphi TC4478 cross-references Dorman OE Solutions 526-687 for the same application
Detailed Description
Delphi TC4478 is a suspension control arm and ball joint assembly made for the front left lower position on BMW i3 and BMW i3s vehicles. Fits 2014-2021 BMW i3, front left lower, and fits 2018-2021 BMW i3s, front left lower. Delphi applies OE-level analysis to help ensure dimensional accuracy and material compatibility between the original part and the replacement component. The result is a service part built around the suspension needs of the BMW i3 platform, including the BMW i3 and BMW i3s.
Common Repair Symptoms
- Front-end clunking or knocking over bumps
- Loose or unstable steering feel
- Uneven tire wear from worn suspension geometry
- Excessive play from a worn ball joint or control arm bushing
- Suspension noise during braking or turning
Installation Notes and Tips
Verify the front left lower position before installation and confirm vehicle fitment by year and model. After replacement, a wheel alignment is recommended to restore suspension geometry and tire wear characteristics. Inspect adjacent steering and suspension components for wear while the assembly is accessible.
Quality Assurance
Delphi validates this part through temperature cycling and corrosion exposure testing, including sub-zero and high-heat conditions plus extended salt spray exposure. That testing supports durability expectations for everyday road use on BMW i3 and BMW i3s applications. Part number TC4478 is engineered with OE-focused compatibility in mind.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2021 | BMW | i3 | Front Left Lower | — |
| 2021 | BMW | i3s | Front Left Lower | — |
| 2020 | BMW | i3 | Front Left Lower | — |
| 2020 | BMW | i3s | Front Left Lower | — |
| 2019 | BMW | i3 | Front Left Lower | — |
| 2019 | BMW | i3s | Front Left Lower | — |
| 2018 | BMW | i3 | Front Left Lower | — |
| 2018 | BMW | i3s | Front Left Lower | — |
| 2017 | BMW | i3 | Front Left Lower | — |
| 2016 | BMW | i3 | Front Left Lower | — |
| 2015 | BMW | i3 | Front Left Lower | — |
| 2014 | BMW | i3 | Front Left Lower | — |
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