2021 BMW M240i Problems: 8 Known Issues

2021 BMW M240i Problems: 8 Known Issues | Au7o

NHTSA Recalls5 recalls

AIR BAGS:KNEE BOLSTER

BMW of North America, LLC (BMW) is recalling certain 2019-2020 230i, 230i xDrive, M240i, M240i xDrive, M2 Competition Coupe, 430i, 430i xDrive, 440i, 440i xDrive, M4, and 2019 330i xDrive Sportswagon vehicles. The driver and passenger knee air bag assemblies may have been improperly folded and assembled.

Campaign #19V35200009/05/2019

SEAT BELTS

BMW of North America, LLC (BMW) is recalling certain 2021 2 Series (230i, 230i xDrive, M240i, M240i xDrive), 330e, 330e Xdrive, 4 Series Coupe (430i, 430i xDrive, M440i xDrive) M4 Coupe, M4 Competition Coupe, BMW 4 Series Convertible (430i, M440i), BMW X1 sDrive28i, xDrive28i, 2 Series Gran Coupe (228i, 228i xDrive, M235i xDrive), M2 Competition Coupe, 330i, 330i xDrive, M340i, M340i xDrive, M3, M3 Competition, 530i, 530i xDrive, 540i, 540i xDrive, MINI Hardtop 2 Door (Cooper, CooperS, JCW), X2 sDrive28i, X2 xDrive28i, X2 M35i, Z4 sDrive30i, Z4 M40i, MINI Hardtop 2 Door (Cooper SE), MINI Convertible (Cooper, Cooper S, JCW), MINI Clubman (Cooper S, Cooper S All4, JCW), MINI Countryman (Cooper, Cooper All4, Cooper S, Cooper S All4, JCW All4), Rolls Royce Ghost, MINI Countryman (Cooper S E All4), Rolls Royce Phantom, Rolls Royce Cullinan, and Toyota Supra vehicles. The passenger seat belt Automatic Locking Retractor (ALR) may deactivate early, before the webbing fully retracts. As such, these assemblies fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."

Campaign #21V55400021/07/2021

AIR BAGS:SIDE/WINDOW

BMW of North America, LLC (BMW) is recalling certain 2023 2 Series Coupe (230i, 230i XDrive, M240i, M240i xDrive) vehicles. The second-row seat backrest cover panels for the side air bags may break during deployment of the side air bags.

Campaign #23V03900001/02/2023

STRUCTURE:BODY:ROOF AND PILLARS

BMW of North America, LLC (BMW) is recalling certain 2021 BMW 230i and M240i vehicles. Supports within the roof liner may be insecurely attached.

Campaign #21V34200012/05/2021

VISIBILITY:POWER WINDOW DEVICES AND CONTROLS

BMW of North Americal, LLC (BMW) is recalling certain 2023 8 Series Coupe (840i, 840i xDrive, M850i xDrive, M8), 8 Series Convertible (840i, 840i xDrive, M850i xDrive, M8), 8 Series Gran Coupe (840i, 840i xDrive, M850i xDrive, M8, Alpine B8 xDrive), 2 Series Coupe (230i, 230i xDrive, M240i xDrive, M2), and 2022-2023 Z4 sDrive30i, Z4 M40i vehicles. When the digital key is removed from the vehicle, the Electronic Control Unit (ECU) software may still allow the power windows and sunroof to be closed. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 118, "Power-operated Window Systems."

Campaign #23V09900017/02/2023

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Frequently Asked Questions

What are the most common BMW M240i problems?

According to Au7o's analysis of 925+ owner reports, the 2021 BMW M240i has 8 documented issues. The most frequently reported are: B58 Polycarbonate Oil Filter Housing Embrittlement Leaking Coolant and Oil, Electric Coolant Pump and Integrated Thermostat Housing Failure, Plastic Charge Pipe Failure Under Boost. Of these, 2 are rated critical and should be addressed promptly.

Is the BMW M240i reliable?

The 2021 BMW M240i has 8 known issues documented across 925+ owner reports. 2 issues are rated critical: B58 Polycarbonate Oil Filter Housing Embrittlement Leaking Coolant and Oil and Electric Coolant Pump and Integrated Thermostat Housing Failure. 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 M240i problems?

Repair costs for known BMW M240i issues range from $0 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, B58 Polycarbonate Oil Filter Housing Embrittlement Leaking Coolant and Oil, typically costs $1,800-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2017-2023 BMW M240i B58 Polycarbonate Oil Filter Housing Embrittlement Leaking Coolant and Oil?

The B58's engine oil filter housing doubles as an oil-to-coolant heat exchanger and is molded from polycarbonate rather than cast aluminum. Heat cycling and vibration embrittle the plastic, and the housing cracks or its gaskets harden so that coolant weeps past the internal coola… Repairs typically run $1,800-$3,500. Severity: high.

What is the 2017-2024 BMW M240i Electric Coolant Pump and Integrated Thermostat Housing Failure?

The B58 uses a fully electric, DME-controlled coolant pump integrated with the thermostat housing. The pump's plastic impeller and its housing seals degrade under the heat cycling of a turbocharged inline six, and the unit either seeps coolant from the housing seam or loses comma… Repairs typically run $700-$1,400. Severity: high.

What is the 2017-2024 BMW M240i Plastic Charge Pipe Failure Under Boost?

The B58 engine uses a plastic charge pipe to route compressed air from the turbocharger to the throttle body. Under sustained high boost conditions, the factory plastic charge pipe can crack, split, or blow off, resulting in an immediate and total loss of boost pressure. This fai… Repairs typically run $200-$600. Severity: medium.

What is the 2017-2024 BMW M240i Valve Cover Gasket Oil Leak?

The B58 engine's valve cover gasket is prone to degradation and oil leaks, typically developing around 60,000-100,000 miles. The rubber gasket material shrinks and dries out through repeated heat cycles, allowing oil to seep and eventually drip down the sides of the engine. In mo… Repairs typically run $500-$900. Severity: medium.

What is the 2017-2024 BMW M240i VANOS Solenoid O-Ring Failure?

The B58 engine's VANOS solenoid o-rings degrade due to wear and high temperatures, causing oil leaks and variable valve timing faults. When the o-rings fail, oil pressure to the VANOS system is compromised, leading to rough idle, reduced power, and check engine lights. This is a… Repairs typically run $150-$500. Severity: medium.

What is the 2017-2024 BMW M240i B58 Direct Injector Seal Failure Causing Misfire and Fuel Dilution?

The B58's solenoid direct injectors sit in the head behind Teflon sealing rings. As the seal hardens and the injector's internals wear, the injector either leaks down into the cylinder after shutdown or delivers an off-spec spray pattern. Owners report cylinder-specific misfires,… Repairs typically run $250-$1,200. Severity: medium.

What is the 2021 BMW M240i Passenger Seat Belt Automatic Locking Retractor Deactivates Early - Recall 21V-554?

BMW opened a voluntary non-compliance recall effective July 15, 2021 covering 2021 vehicles built between November 23, 2020 and May 28, 2021, spanning BMW, MINI, Rolls-Royce and the jointly developed Supra, with 2021 M240i in the affected population. The safety belt retractors ot… Repairs typically run $0-$0. Severity: medium.

What is the 2017-2024 BMW M240i B58 High-Pressure Fuel Pump Cannot Hold Rail Pressure Under Load?

The M240i runs a two-pump fuel system - an in-tank low-pressure pump feeding a cam-driven high-pressure pump on the B58's head. As the HPFP's internal valve and cam follower wear, the pump can still idle and cruise normally but cannot maintain commanded rail pressure during hard… Repairs typically run $700-$1,400. Severity: medium.

All 8 Known Issues

2017-2023 BMW M240i: B58 Polycarbonate Oil Filter Housing Embrittlement Leaking Coolant and Oil#

2017-2024 BMW M240i: Electric Coolant Pump and Integrated Thermostat Housing Failure#

2017-2024 BMW M240i: Plastic Charge Pipe Failure Under Boost#

2017-2024 BMW M240i: Valve Cover Gasket Oil Leak#

2017-2024 BMW M240i: VANOS Solenoid O-Ring Failure#

2017-2024 BMW M240i: B58 Direct Injector Seal Failure Causing Misfire and Fuel Dilution#

2021 BMW M240i: Passenger Seat Belt Automatic Locking Retractor Deactivates Early - Recall 21V-554#

2017-2024 BMW M240i: B58 High-Pressure Fuel Pump Cannot Hold Rail Pressure Under Load#

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