BMW · Known Issues

2017-2020 BMW M240i Problems: 1 Issue Every Owner Should Know

2017-2020 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated July 2026

2021 BMW M240i: tracking in progress

The 2021 BMW M240i 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 2017–2020 generation are shown below — many of these typically carry over to the next year before being addressed in mid-cycle refreshes.

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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2017-2020 BMW M240i has 1 documented issue, with 1 rated critical. The most serious is F2x Cylinder-Head Coolant Vent-Line Service Action. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common BMW M240i problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2017-2020 BMW M240i has 1 documented issue. The documented issue is: F2x Cylinder-Head Coolant Vent-Line Service Action. Of these, 1 is rated critical and should be addressed promptly.

Is the BMW M240i reliable?

The 2017-2020 BMW M240i has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: F2x Cylinder-Head Coolant Vent-Line Service Action. 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 M240i is the most reliable?

Reliability varies across model years of the BMW M240i. 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 2017-2020 BMW M240i with 1 documented issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

What is the 2017-2020 BMW M240i F2x Cylinder-Head Coolant Vent-Line Service Action?

BMW SIB 17 01 21 covers affected F22 and F23 vehicles produced from April 24, 2015 through September 24, 2019. The quick-disconnect coupling on the cylinder-head coolant vent line can break at the cylinder head because the line may not withstand high temperatures over its service… Severity: high.