TSB B120326 — BMW Warranty extension
B120326 is a warranty extension on file with NHTSA for 2 BMW models, 2023–2026 model years, filed and re-filed as 4 documents. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Due to an implementation error in various OBD diagnostics in the vehicle's control units, in very rare cases itmay happen that stored fault memory codes (DTCs) and the MIL (warning light) are not automaticallydeleted even though the underlying malfunction has already been…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. B120326 is filed as a warranty extension, which unlike an ordinary bulletin can mean free or reimbursed work when a vehicle qualifies. Ask a dealer using the document ID below, and check open recalls separately at nhtsa.gov/recalls.
Vehicles and model years B120326 names
Every document filed under B120326
Manufacturers re-issue a bulletin as the repair changes, and file separate copies for technicians and for owners. All of them carry the same number.
| Document ID | Filed | Type |
|---|---|---|
| B120326 | July 10, 2026 | Emissions communication |
| B120326 | June 19, 2026 | Warranty extension |
| B120326 | March 19, 2026 | Emissions communication |
| B120326 | March 11, 2026 | Emissions communication |
What B120326 covers
Engine, Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB B120326?
B120326 is a warranty extension filed with NHTSA by BMW, covering 2 BMW models across the 2023–2026 model years. NHTSA's summary reads: Due to an implementation error in various OBD diagnostics in the vehicle's control units, in very rare cases itmay happen that stored fault memory codes (DTCs) and the MIL (warning light) are not automaticallydeleted even though the underlying malfunction has already been…
Which vehicles does B120326 cover?
NHTSA's file names BMW X3 (2023–2026); BMW X5 (2023–2026). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB B120326 a recall, and is the repair free?
B120326 is filed as a warranty extension, not a recall — but this is the kind of communication that can mean free or reimbursed work if your VIN qualifies. Take the number to a dealer and ask. Recalls are separate and always free; check yours by VIN at nhtsa.gov/recalls.
How do I get the full text of B120326?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under B120326, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under B120326. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.