2 Automatic transmission parts are listed for the 2021 BMW 420I, in 2 part types, covering the 2.0L L4 Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 BMW 420I, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. All 2 listed parts are Filter (1 part) and Fluid Pan (1 part).
The 2021 BMW 420I came with a single engine, the 2.0L L4 Turbocharged, and every part is verified against it.
2 brands supply automatic transmission parts for the 2021 BMW 420I, led by ATP (1 part) and ELRING (1 part).
Each part number listed for the 2021 BMW 420I opens a page with every vehicle that part fits.
Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP | B205 | 🇲🇽 MX | Premium Replacement | View on Amazon |
This table covers the replacement filters for this application — the table heading and notes say which circuit. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
One part is listed for the 2021 BMW 420I — ATP B205.
Fluid Pan
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | 224210 | 🇲🇽 MX | with Seal | View on Amazon |
This table covers the pans that hold automatic-transmission fluid.
This group shows a single part: ELRING 224210.
Buying Automatic Transmission Parts for a 2021 BMW 420I
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Confirm you have the 2.0L L4 Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Filter and Fluid Pan .
Frequently Asked Questions
How many automatic transmission parts fit the 2021 BMW 420I?
Our catalog currently lists 2 automatic transmission parts for the 2021 BMW 420I across 2 subcategories and 2 brands, covering the 2.0L L4 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of automatic transmission problems on a 2021 BMW 420I?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. 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 the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
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 420I 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 420I?
Every part on this page is matched to the 2.0L L4 Turbocharged engine. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW 420I
Automatic Transmission Parts for Other BMW 420I Years
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