# Service bulletin B520521

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: 10190855
- Published by NHTSA: 2021\-04\-26
- Manufacturer's number: B520521
- Manufacturer's date: 2021\-03\-01
- NHTSA component: WHEELS; STRUCTURE

## NHTSA's summary

REWORK SEAT MECHANISM 2ND ROW SEAT: The mounting nuts on the rear left seat frame \(60% seat, situated behind the driver's seat\) were not properly tightened.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10190855-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10190855-9999.pdf)

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

## Components

Body and frame, Wheels

## Vehicles listed

- 2019 to 2021 BMW X7

## Recalls for the same vehicles and component

- [2022202](/recalls/tc/2022202.md), 2022-04-20: Structure
- [19V541000](/recalls/nhtsa/19V541000.md), 2019-07-23: WHEELS:LUGS/NUTS/BOLTS/STUDS

## Other bulletins for the same vehicles and component

- [B010226DCS](/bulletins/11036453.md), 2026-08-28, Other: STRUCTURE:BODY. BMW Notice of the Court’s Final Approval for Shark\-Fin Antenna Settlement \(X3, X4, X5, X6, X7\)
- [B010226](/bulletins/11036388.md), 2026-08-27, Service bulletin: STRUCTURE:BODY. Rear Roof Antenna Shark Fin Cover Sealing Issue
- [B010226](/bulletins/11033030.md), 2026-06-01, Warranty extension: STRUCTURE:BODY. SHARK FIN ROOF ANTENNA SEALING SETTLEMENT Extended Warranty
- [B640320](/bulletins/11032741.md), 2026-05-18, Service bulletin: STRUCTURE:BODY. The center console and front cup holder get noticeably too warm to the touch on long journeys with the interior "Heating on".
- [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.
- [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.
- [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.
- [B270220](/bulletins/11016472.md), 2025-04-04, Service bulletin: POWER TRAIN; WHEELS. There is a jerking or shuddering during either or both of the following: Cornering or accelerating from low speeds Driving with low to medium loads There are no warning lights or Check Control messages.
- [B660325](/bulletins/11016446.md), 2025-04-03, Service bulletin: STRUCTURE:BODY. A check control message is displayed, indicating that the parking assistance systems have limitedfunctionality due to errors detected within PDC sensors. The warning indicates parking assistance featureshave limited functionality while the errors continue to be detected. Following faults may be stored 8031BA Ultrasonic Sensor Rear Side Left Software Error 8031CO Ultrasonic Sensor Rear outer left Software Error 8031AE Ultrasonic Sensor Rear Outer Right Software Error 8031A8 Ultrasonic Sensor Rear Side Right Software Error 8031B4 Ultrasonic Sensor Rear Middle Right Software Error 8031C6 Ultrasonic Sensor Rear Middle Left Software Error 8031CD Ultrasonic Sensor Voltage Supply Sensors Back: Short Circuit 8031CC Ultrasonic Sensor Voltage Supply Front: Short Circuit 8031CA Ultrasonic Sensors Front Extraneous Noise

JSON: [/v1/bulletins/10190855](/v1/bulletins/10190855)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20B520521&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10190855&vehicle=Service%20bulletin%20B520521)