# Service bulletin B510721

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10194300
- Published by NHTSA: 2021\-05\-24
- Manufacturer's number: B510721
- Manufacturer's date: 2021\-04\-01
- NHTSA component: STRUCTURE:BODY:DOOR

## NHTSA's summary

INCREASED EFFORT REQUIRED TO OPEN DOORS: One or more doors may require increased effort to open.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194300-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10194300-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Body and frame

## Vehicles listed

- 2020 to 2021 BMW 228I
- 2021 BMW 330E
- 2019 to 2021 BMW 330I
- 2021 BMW 430I
- 2020 to 2021 BMW M235I
- 2021 BMW M3
- 2020 to 2021 BMW M340I
- 2021 BMW M4
- 2021 BMW M440I
- 2019 to 2021 BMW Z4

## Recalls for the same vehicles and component

- [19V755000](/recalls/nhtsa/19V755000.md), 2019-10-23: STRUCTURE:BODY:TRUNK LID

## Other bulletins for the same vehicles and component

- [B010325](/bulletins/11030060.md), 2026-03-13, Warranty extension: STRUCTURE:BODY. The Radiator Grilles Lower Active Air Flap Assembly limited warranty for defects in materials and/or workmanship has been extended to 15 years / 150,000 miles as determined from the original first in\-service / delivery date.
- [B410725](/bulletins/11027766.md), 2026-01-23, Service bulletin: STRUCTURE:BODY. While driving on a smooth and/or unevenroad, a “cracking” sound is heard from therear wheel arch area \(highlighted in orange\) on either the right or left side.
- [B410725](/bulletins/11022101.md), 2025-08-24, Service bulletin: STRUCTURE:BODY. While driving on a smooth and/or uneven road, a “cracking” sound is heard from the rear wheel arch area \(highlighted in orange\) on either the right or left side.
- [B511223](/bulletins/11020911.md), 2025-07-28, Warranty extension: STRUCTURE:BODY. After carrying out the vehicle test, one or more of the stored faults indicate that the operation of the front bottom active air flap is obstructed or blocked.
- [B010825](/bulletins/11018730.md), 2025-05-31, Warranty extension: STRUCTURE:BODY. A vehicle listed above may arrive with a Check Control Message \(CCM\), and/or malfunction indicator lamp\(MIL\) illuminated. After carrying out the vehicle test, one or more of the stored faults indicate that the operation of the front bottomactive air flap is obstructed or blocked. Thoroughly inspect the front bottom air flap, when applicable, remove any contamination that is found caught inand between the bottom air flaps \(aka “blinds”\) and/or the housing.
- [B513019](/bulletins/11017506.md), 2025-05-02, Service bulletin: STRUCTURE:BODY. A groaning noise is present from the door frame of any door, most commonly when driving over rough roadsor during body flex. This situation may be worse in vehicles which are regularly waxed in th e area of the door jamb.
- [B010325](/bulletins/11017103.md), 2025-04-18, Warranty extension: STRUCTURE:BODY. The Radiator Grilles Lower Active Air Flap Assembly limited warranty for defects in materials and/or workmanship has been extended to 15 years / 150,000 miles as determined from the original first in\-service / delivery date.
- [B010725](/bulletins/11017102.md), 2025-04-18, Warranty extension: STRUCTURE:BODY. The Radiator Grilles Lower Active Air Flap Assembly limited warranty for defects in materials and/or workmanship has been extended to 15 years / 150,000 miles as determined from the original first in\-service / delivery date.
- [B540225](/bulletins/11016441.md), 2025-04-03, Service bulletin: STRUCTURE:BODY. While driving on an uneven road, a “clicking”sound is heard from the front bow/cowl panelarea of the convertible top.
- [B540324](/bulletins/11013048.md), 2025-01-23, Service bulletin: STRUCTURE:BODY. The convertible top does not open or close.

JSON: [/v1/bulletins/10194300](/v1/bulletins/10194300)

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