2014-2025 BMW 4 Series Problems: 4 Known Issues
2014-2025 model years · 450+ owner reports · Updated November 2026
According to Au7o's analysis of 450+ owner reports, the 2014-2025 BMW 4 Series has 4 documented known issues, with 1 rated critical. The most serious is Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis. The most commonly reported issue is B58 Charge Pipe Pop-Off Under Boost with 250 owner reports. Across all issues with published estimates, repair costs range from $200 to $1,200. DIY maintenance guides at au7o.io.
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All 4 Known Issues
NHTSA Recalls1 recall
POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)
BMW of North America, LLC (BMW) is recalling certain 2023 Toyota GR Supra, 3 Series Sedan (330i xDrive, M340i xDrive, M3), 5 Series Sedan (530i, 530i xDrive, M5), 4 Series Gran Coupe (430i, 430i xDrive), 4 Series Coupe (430i, 430i xDrive, M440i xDrive), 4 Series Convertible (430i, 430i xDrive, M440i xDrive), 8 Series Coupe (840i, M850i xDrive, M8), 8 Series Convertible (840i, M850i xDrive, M8), 8 Series Gran Coupe (850i xDrive, M8), X3 SAV (X3 xDrive30i, X3M), X4 SAV (X4 xDrive30i), X5 SAV (X5 xDrive40i, X5 M50i, X5M), X6 SAV (X6 xDrive40i, X6 M50i, X6M), and Z4 sDrive30i, Z4 M40i vehicles. The weld seam of the integrated transmission control unit's cover may not have been manufactured properly, which could allow automatic transmission oil to leak into the transmission control unit.
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Frequently Asked Questions
What are the most common BMW 4 Series problems?
According to Au7o's analysis of 450+ owner reports, the 2014-2025 BMW 4 Series has 4 documented issues. The most frequently reported are: Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis, B58 Charge Pipe Pop-Off Under Boost, Valve Cover Gasket Leak and PCV Failure. Of these, 1 is rated critical and should be addressed promptly.
Is the BMW 4 Series reliable?
The 2014-2025 BMW 4 Series has 4 known issues documented across 450+ owner reports. 1 issue is rated critical: Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis. 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.
How much does it cost to fix common BMW 4 Series problems?
Repair costs for known BMW 4 Series issues range from $200 to $1,200, 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 year BMW 4 Series is the most reliable?
Reliability varies across model years of the BMW 4 Series. 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 2014-2025 BMW 4 Series with 4 documented issues documented across 450+ owner reports.
What is the 2014-2015 BMW 4 Series Lower-Engine Whine Requires 428i N20/N26 Timing-Chain Diagnosis?
BMW SIB 11 03 17 identifies specified F32, F33 and F36 428i variants with N20 or N26 engines produced through February 2015. A whining noise from the lower engine area that rises with engine speed can be associated with wear in the timing-chain or oil-pump drive-chain system; the… Severity: high.
What is the 2017-2025 BMW 4 Series B58 Charge Pipe Pop-Off Under Boost?
The plastic charge pipe (turbocharger to throttle body) on B58-powered 440i and M440i models can pop off or crack under high boost pressure. This happens mostly on tuned cars running raised boost, and stock-boost failures are reported as uncommon. The OEM plastic pipe uses a pres… Repairs typically run $200-$500. Severity: medium.
What is the 2014-2016 BMW 4 Series Valve Cover Gasket Leak and PCV Failure?
The valve cover gasket on N20 (428i) and N55 (435i) engines develops leaks typically between 60,000-90,000 miles. The integrated PCV valve within the valve cover can also fail, causing excessive crankcase pressure, oil consumption, and rough running. Oil seepage from the valve co… Repairs typically run $500-$1,200. Severity: medium.
What is the 2014-2016 BMW 4 Series N55 VANOS Solenoid Failure - 435i F32/F33/F36?
The N55 3.0L turbocharged inline-6 engine in 435i models experiences VANOS (Variable Valve Timing) solenoid failures. These solenoids control oil flow to the VANOS system for variable valve timing. Internal wear causes them to stick or fail, leading to rough running, power loss,… Repairs typically run $250-$800. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.