What are the most common BMW 4 Series problems?

According to Au7o's analysis of 250+ owner reports, the 2021-2021 BMW 4 Series has 1 documented issues. The most frequently reported are: B58 Charge Pipe Pop-Off Under Boost. None are rated critical, but regular maintenance is recommended.

Is the BMW 4 Series reliable?

The 2021-2021 BMW 4 Series has 1 known issues documented across 250+ owner reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common BMW 4 Series problems?

Repair costs for known BMW 4 Series issues range from $200 to $500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2017-2025 BMW 4 Series B58 Charge Pipe Pop-Off Under Boost?

The plastic charge pipe (intercooler to throttle body) on B58-powered 440i and M440i models can pop off or crack under high boost pressure, especially in warm weather or during spirited driving. The OEM plastic pipe uses a pressed-on connector that weakens over heat cycles. When… Repairs typically run $200-$500. Severity: medium.

BMW · Known Issues

2021 BMW 4 Series Problems: 1 Issues Every Owner Should Know

2021 model year · 250+ owner reports · Updated June 2026

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According to Au7o's analysis of 250+ owner reports, the 2021 BMW 4 Series has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is B58 Charge Pipe Pop-Off Under Boost with 250 owner reports. Across all issues, repair costs range from $200 to $500. DIY maintenance guides at au7o.io.

2021 BMW 4 Series Problems: 1 Issues Every Owner Should Know

All 1 Known Issues

2017-2025 BMW 4 Series: B58 Charge Pipe Pop-Off Under Boost#

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Frequently Asked Questions

What are the most common BMW 4 Series problems?

Is the BMW 4 Series reliable?

How much does it cost to fix common BMW 4 Series problems?

What is the 2017-2025 BMW 4 Series B58 Charge Pipe Pop-Off Under Boost?