BMW · Known Issues

2019-2022 BMW M340i Problems: 2 Issues Every Owner Should Know

2019-2022 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated July 2026

2024 BMW M340i: tracking in progress

The 2024 BMW M340i is new enough that early-production reliability data hasn't yet emerged. We're actively tracking owner reports as they come in. In the meantime, the most common issues reported on the 2019–2022 generation are shown below — many of these typically carry over to the next year before being addressed in mid-cycle refreshes.

Already own a 2024 BMW M340i? Share your experience and help us track this generation.

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019-2022 BMW M340i has 2 documented known issues, with 2 rated critical. The most serious are 2020 M340i Brake-Assist Recall 21V-598 and 2019-2022 M340i Seat-Belt Warning Recall 23V-584. DIY maintenance guides at .

Frequently Asked Questions

What are the most common BMW M340i problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019-2022 BMW M340i has 2 documented issues. The most frequently reported are: 2020 M340i Brake-Assist Recall 21V-598, 2019-2022 M340i Seat-Belt Warning Recall 23V-584. Of these, 2 are rated critical and should be addressed promptly.

Is the BMW M340i reliable?

The 2019-2022 BMW M340i has 2 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 2 issues are rated critical: 2020 M340i Brake-Assist Recall 21V-598 and 2019-2022 M340i Seat-Belt Warning Recall 23V-584. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

What year BMW M340i is the most reliable?

Reliability varies across model years of the BMW M340i. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2019-2022 BMW M340i with 2 documented issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

What is the 2020 BMW M340i 2020 M340i Brake-Assist Recall 21V-598?

NHTSA campaign 21V-598 covers certain model-year 2020 BMW M340i and M340i xDrive vehicles. During engine start, engine-management software can command the combined oil/vacuum pump in a way that damages it, reducing or eliminating vacuum brake assistance. Full mechanical braking r… Severity: high.

What is the 2019-2022 BMW M340i 2019-2022 M340i Seat-Belt Warning Recall 23V-584?

BMW SIB 65 23 23 and NHTSA campaign 23V-584 cover certain model-year 2019-2022 G20 M340i vehicles. Receiver Audio Module software may delay or fail to generate the audible driver seat-belt warning, causing noncompliance with FMVSS 208 and increasing injury risk if a driver relies… Severity: high.