Six-cylinder G42 coupe with the B58 turbocharged 3.0-litre and standard xDrive all-wheel drive, paired exclusively to the ZF 8HP automatic. Sits below the G87 M2 in the line-up but shares the same CLAR platform underpinnings. The B58 is well-proven across the BMW range, and the M240i is still young enough that long-term wear patterns are only just emerging.· more· less
Robust B58 inline-six engineZF 8HP automatic is dependable
Oil filter housing coolant leaksMultiple early recalls to verify
Buy if: You want a fast straight-six coupe with AWD traction and can verify all recalls are completed and the cooling system is leak-free.
Avoid if: You expect cheap running costs or are buying without confirming the steering gear recall (2024) and ECU key-removal recall have been actioned.
Plastic coolant vent hose and OFHG gasket degrade from heat, typically appearing from 80,000 km onwards · more· less
The B58 oil filter housing module uses a plastic coolant vent hose and rubber gaskets that become brittle from heat cycles. Symptoms include a sweet coolant smell, declining coolant level, and white crystalline residue near the filter housing. Most G42 cars are still too young to show this, but the design is identical to the F20 M140i and F22 M240i, where the issue typically appears between 80,000 and 120,000 km. A permanent repair replaces the full OFHG set, plastic vent hose, and single-use aluminum bolts simultaneously. Independent specialist cost is €600-900; BMW dealers charge €1,000-1,500. A class action lawsuit was filed against BMW in early 2026 over this issue across B46/B48/B58 engines.
PCV diaphragm failure (integrated in valve cover)
€150 - 1,2002 of 7
Rubber PCV diaphragm inside the updated B58TU1 valve cover degrades, causing oil smoke and rough running · more· less
On the updated B58TU1 fitted to the G42 M240i, the PCV diaphragm is integrated into the valve cover rather than being a separate part. When the diaphragm tears, the entire valve cover assembly must be replaced rather than just a gasket. Symptoms include blue/white exhaust smoke, increased oil consumption, rough idle, and occasionally limp mode. BMW issued a warranty extension (SIB 01 14 23) covering the PCV valve cover for 15 years/240,000 km from the original in-service date, which applies to most G42 cars. Outside warranty, full valve cover replacement at a dealer costs €800-1,200 including labor. Aftermarket diaphragm-only repair kits are not viable on the integrated TU1 design.
Steering gear loose bolts (recall)
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Steering gear mounting bolts may not have been tightened correctly, can cause loss of control · more· less
Affects 2024 production M240i and other G-series models. The steering gear bolts may not have been tightened to the correct torque, allowing the gear to loosen during operation. This recall was issued in January 2024 and BMW replaces the steering gear free of charge. Verify the recall has been completed before purchase by checking with a BMW dealer using the VIN. If not yet done, the work is free under recall but the car should not be driven hard until it has been actioned. Symptoms include steering vagueness, knocking from the steering column, or wandering at speed.
VANOS solenoid O-ring leak
€200 - 5004 of 7
Variable valve timing solenoid O-rings harden over time, causing rough idle and fault codes · more· less
The VANOS solenoid O-rings are a wear point on all B58 engines. The rubber hardens with age and oil contact, allowing oil to seep past, which triggers VANOS fault codes, rough idle, and reduced performance. Typically appears after 80,000-100,000 km. Solenoids cost €80-100 each and replacement takes around 30 minutes per side. Professional repair runs €200-500. Many owners report this as a straightforward DIY fix on the B58.
Electric water pump premature failure
€500 - 1,2005 of 7
Electric water pump can fail before 80,000 km, causing overheating warning · more· less
Like other modern BMW engines, the B58 uses an electric water pump. Some failures have been reported on B58 applications before 80,000 km, though it is not a widespread G42-specific issue. Symptoms include intermittent overheating warnings, coolant temperature spikes, or limp mode. Replacement cost is €500-800 at independents and €900-1,200 at BMW dealers, including coolant and a new thermostat which is recommended at the same time. The pump is buried at the front of the engine, so labor is the main cost.
Infotainment and electrical glitches
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iDrive 8 unresponsive screens, driver-assist warnings and digital key faults · more· less
The G42 uses iDrive 8 which has had a rocky early life. Owner reports include unresponsive touchscreens, restricted driver assistance warnings (lane keep, heated steering), and the digital key not always being recognized. Most issues are resolved by software updates, which BMW provides over-the-air or at the dealer free of charge during warranty. Outside warranty, dealer diagnostic and software work runs €100-300. Hardware replacement of the head unit, if needed, can reach €700-800. Also affected: the 2023 ECU recall that allowed windows and sunroof to operate after the digital key was removed.
Headlight condensation
€0 - 1,5007 of 7
Driver side LED headlight develops internal condensation, sometimes requiring unit replacement · more· less
Some G42 owners have reported internal condensation in the driver-side headlight unit. Light condensation often clears with use, but persistent moisture indicates a seal failure. Under warranty, BMW replaces the headlight unit free of charge. Outside warranty, a new LED headlight unit costs €1,000-1,500 including labor. Check both headlights carefully on a viewing, especially after rain or a car wash.
Solid reliability profile, but verify all recalls
The G42 M240i benefits from the well-proven B58 engine and the dependable ZF 8HP automatic. Most known weak points (OFHG, PCV, VANOS) are shared with older B58 cars and typically appear after 80,000 km, so current G42 examples are mostly too young to show them yet. The bigger near-term concern is the cluster of early recalls — particularly the 2024 steering gear recall — which must be verified completed before purchase. iDrive 8 has had software teething issues that are largely resolved by updates.
Service history
Complete BMW dealer or specialist records essential. Verify oil changes were done at maximum 15,000 km intervals, not BMW's longlife recommendation.
Tires
Check tread depth, age (date codes), and uneven wear. Staggered fitment on 19-inch wheels means rears wear faster, especially with xDrive driven hard.
Cold start
Start the engine completely cold. Listen for any unusual rattling, knocking, or metallic sounds in the first 30 seconds.
Test drive
Minimum 30 minutes including motorway speeds. Pay attention to gearbox smoothness, any vibrations from the steering, and driver-assist warnings.
Specific for this vehicle
Verify steering gear recall completed (2024 production)
This is the most important check on a 2024 M240i. Confirm with BMW dealer using VIN that the steering gear has been replaced or inspected free of charge.
Verify ECU key-removal recall completed (2023 M240i xDrive)
Software update so windows and sunroof cannot operate after the digital key is removed. Confirm with BMW dealer using VIN.
Verify rear seat backrest cover recall completed (2023)
Second-row backrest cover panels could break during side airbag deployment. Confirm replacement was done.
+ 5 more checksShow less
Check coolant level and inspect for OFHG seepage
Open the expansion tank and check level. Inspect the oil filter housing area for white crystalline residue or wet spots, even on low-mileage cars.
Inspect both headlights for internal condensation
Look carefully inside the headlight units, especially the driver side. Check after rain or wash. Persistent condensation needs warranty attention.
Test iDrive 8, digital key and driver-assist systems
Cycle through iDrive menus, test the digital key (if available), and check for any restricted driver assistance warnings. Ask whether the latest software update has been applied.
Check for engine oil leaks and exhaust smoke
Inspect the engine bay for any oil residue around the valve cover and oil filter housing. After warm-up, accelerate hard and check the mirror for blue/white smoke.
Verify PCV warranty extension eligibility
BMW extended the PCV valve cover warranty to 15 years/240,000 km. Most G42 cars are still well within this. Check eligibility with BMW dealer using VIN.
ECU allows windows/sunroof to close after digital key removed (2023 M240i xDrive)Verify completed
Second-row backrest cover panels fracture during side airbag deployment (2023)Verify completed
Engine stall recall on early G42 productionVerify completed
PCV valve cover warranty extension (SIB 01 14 23) — 15 years/240,000 kmCheck eligibility with BMW dealer
Contact a BMW dealer with the VIN to verify all recalls have been completed. The 2024 steering gear recall is particularly important and must be confirmed before purchase. The PCV warranty extension covers the most common B58 wear item and applies to most G42 cars.
Warranty Status
Factory warranty (3 years, no km limit)Active on most G42 cars until 2025-2027
PCV valve cover extended warranty15 years / 240,000 km from first registration
Rust perforation warranty (12 years)Active on all G42 cars
Most G42 M240i examples are still within their original 3-year factory warranty (from November 2016 BMW extended to 3 years). The PCV valve cover warranty extension covers the most common B58 wear item for 15 years/240,000 km. Verify both with a BMW dealer using the VIN.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
