2018 BMW Serie 5 problems

• B47 168-190 hp, single turbo (2014-)

  168–188 hp · B47D20, B47C20

  Same documented risk of EGR cooler and timing chain failure as the rest of the B47 range.^[2][3]

  With caution

Faults that affect 2018 cars

• High severityFrequency: OccasionalTimingTiming chain wear (improved, but is it really at the front?)BMW improved the chain's tensioner, guides and oil supply compared with the N47, and failures take much longer to appear. But a specialist workshop insists the chain is still at the rear of the block, not at the front as is often claimed, so repairing it still means removing the engine or the gearbox.
• High severityFrequency: OccasionalTurboPremature turbo wear from neglected maintenanceThe B47's turbo does not have a design flaw as well documented as the N47's, but it can wear out early if oil changes are not respected, with repairs that usually run at around €1,000 to €2,000.Repair (garage): €1,000–€2,000
• Medium severityFrequency: CommonEmissions controlParticulate filter (DPF) clogging in urban useYes: as on most modern diesels, the B47's particulate filter can clog with soot in cars used in town on short journeys, with cleaning or replacement costing from €500 to €1,800 depending on the condition of the filter.Repair (garage): €500–€1,800

• B58 340-360 hp (B58B30M0, 2016-2019)

  340–360 hp · B58B30M0

  It shares the weak points of the first series (PCV valve, oil filter housing and pre-2021 oil pump); check which parts have already been replaced.^[6][7][8]

  With caution

• B58TU 333-340 hp (B58B30M1, since 2018)

  333–340 hp · B58B30M1, B58B30C

  FCP Euro notes that the TU gives fewer PCV problems, but units built before 2021 may have the oil pump with a plastic housing, and the oil filter housing remains a part to watch.^[6][8]

  With caution

Faults that affect 2018 cars

• High severityFrequency: OccasionalLubricationFailure of the oil pump with a plastic rotor housingB58s built before 2021 have an oil pump with a plastic rotor housing which, according to US press and retailers, can fail: abnormal oil pressure, a whine and warnings. It is cited on 2019-2020 M340i models without the ZTK package and on X5 and X7 models built before mid-2020.
• Medium severityFrequency: CommonLubricationOil and coolant leak from the plastic oil filter housingThe B58's plastic oil filter housing can crack or lose its seal with heat and age, letting oil, coolant or both escape. One parts retailer puts the failure between 60,000 and 100,000 miles (roughly 97,000-161,000 km).Appears at around 97,000 km
• Medium severityFrequency: CommonLubricationFailure of the crankcase ventilation PCV valve (integrated in the valve cover)On the first-generation B58 the PCV valve, integrated in the valve cover, can tear its diaphragm and stop separating oil from the crankcase gases. It causes blue or white smoke, a whistling noise, higher oil consumption and misfires; the whole cover is usually replaced.
• Medium severityFrequency: CommonLubricationOil leak from the valve cover gasketThe rubber gasket on the B58's valve cover hardens with heat cycles and eventually leaks oil: a burning smell, smoke near the cover and oil on the spark plugs. Guides place it between 60,000 and 100,000 miles (97,000-161,000 km).Appears at around 97,000 km
• Medium severityFrequency: OccasionalCoolingCoolant loss from the cap or the expansion tankCoolant loss is one of the most repeated problems in B58 guides. Workshops first suspect the expansion tank cap and also check the intercooler tank, the pipes and the pump before thinking about the head gasket.
• Medium severityFrequency: OccasionalCoolingWater pump and thermostat module (thermal management) leakOn the B58 the water pump and the thermostat module (thermal management) can leak coolant, with a low-level warning and traces of fluid at the back of the engine. Guides place pump failures between 75,000 and 120,000 miles and module failures from around 40,000.Appears at around 120,000 km

• 3rd generation, with electrification (from 2018)

  · 8HP51, 8HP76, 8HP95, 850RE

  There is less accumulated mileage and fewer accounts than with the earlier versions, and on plug-in hybrid models there are added electronic warnings shared between the engine and the gearbox that complicate diagnosis. There are no known systemic defects, but there is less track record to confirm it.^[11]

  With caution

Faults that affect 2018 cars

• High severityFrequency: OccasionalElectronicsMechatronic failure as the gearbox ages (sometimes with reverse)Yes, although in a minority of cases: there are documented ZF 8HP mechatronic failures on BMW after 120,000-130,000 km, costing €1,400 to €3,500, and also control unit or electronic selector faults on Audi and Land Rover.Repair: €1,400–€3,500
• Medium severityFrequency: CommonTransmissionJerking and hesitation when changing gear, sometimes needing reprogrammingYes: on BMW, Audi, Jaguar and Alfa Romeo there are accounts of jerking, hesitation or harsh shifts with the ZF 8HP. It is usually due to ageing oil or the calibration of the mechatronics, and the dealer often fixes it -not always first time- by reprogramming the gearbox control unit.
• Medium severityFrequency: OccasionalLubricationOil leaks from the gearbox gaskets or sumpYes: on the BMW 1 Series and the Jaguar F-Pace there are accounts of oil leaks from the ZF 8HP gearbox gaskets, in one case already at 40,000 km. If it is not repaired soon, the loss of pressure can speed up internal wear and lead to the jerking or mechatronic failure of the related faults.Repair (garage): €1,000–€2,000

• B48 2.0 178-197 hp (120i, 220i, 320i, 520i, X1/X2/X3 20i, MINI Cooper S)

  178–197 hp · B48A20, B48B20

  It is the most widely fitted B48 version and has no serious, widespread fault on record; it is worth checking the cooling circuit and any oil leaks next to the turbo and the VANOS.^[13]

  Buy

• B48 2.0 252-258 hp (330i, 530i, X3/X4 xDrive30i)

  252–258 hp · B48A20, B48B20

  It shares its block and architecture with the rest of the B48; we have found no serious, widespread fault on record that is specific to this more powerful version.^[13][14]

  Buy

Faults that affect 2018 cars

• Medium severityFrequency: OccasionalCoolingDeterioration of hoses and seals in the cooling circuit, with coolant lossYes: over the years and many heat cycles, the hoses, the expansion tank and some of the plastic seals in the B48/B38 cooling circuit can deteriorate and lose coolant, sometimes without any visible puddle under the car.
• Medium severityFrequency: OccasionalLubricationOil leaks or seepage from seals and covers, near the turbo and the VANOSYes: over time, oil seepage or leaks can appear at seals, covers and crankcase ventilation connections, in an area of the engine close to the turbo and the VANOS system.
• High severityFrequency: RareTimingTiming chain on the early units (2014-2018), redesigned in the B48TUWe have found no documented cases of timing chain breakage on the B48. The one concrete fact that does exist is that BMW redesigned the chain as a single piece in the 2018 B48TU update, which points to an area for improvement in engines built before that date.
• Low severityFrequency: CommonIntakeCarbon build-up on the intake valves (direct injection)Yes, as on most direct-injection engines: because they are not washed by fuel, the intake valves on the B48/B38 build up carbon over the years, especially in urban use, with a loss of smoothness and a less stable idle.

• B57D30 265 hp, single turbo (B57D30O0, 2015-2020)

  265 hp · B57D30O0

  There are no manufacturer campaigns or widespread faults documented for this version in the sources consulted; the issues described by a specialist garage (AdBlue, rear chain) are occasional or rare. It is worth checking the history of the AdBlue system.^[17]

  Buy

• B57D30 320 hp, twin turbo (B57D30T0, 2015-2020)

  320 hp · B57D30T0

  This is the version for which a specialist garage places the 540d xDrive EGR cooler technical action in 2022; it is worth asking a dealer whether the car has had it done.^[17]

  With caution

• B57D30 400 hp, four turbos (B57D30S0, 2016-2020)

  400 hp · B57D30S0

  A specialist garage recommends watching for oil in the intercooler and intake ducts on multi-turbo versions as the first warning of degradation; it is complex machinery and expensive to repair.^[17]

  With caution

Faults that affect 2018 cars

• Medium severityFrequency: OccasionalEmissions controlAdBlue/SCR system fault (NOx sensors, heater and pump)A specialist garage considers the B57's AdBlue/SCR system the fault that most often leaves cars immobilised: a NOx sensor, the quality sensor, the heater or the pump usually fails, and topping up the tank rarely stops the countdown of remaining starts.
• High severityFrequency: RareEmissions controlEGR cooler leaks on the B57 (limited action on the 540d xDrive)Unlike the N47 and N57, the B57 was left out of the big EGR campaigns of 2018 and 2021; a specialist garage cites only one action in 2022 for the 540d xDrive and another limited one in 2024. The fault exists but is uncommon.
• High severityFrequency: RareTimingTiming chain wear on the gearbox sideDasercars states that the B57 does not repeat the N47's premature chain wear, but that the chain is still on the gearbox side, so any work on it is expensive. A brief rattle when cold should be checked soon.
• High severityFrequency: RareTurboDegradation of the turbos on multi-turbo versionsOn the twin-turbo and four-turbo versions, a specialist garage considers oil in the intercooler or intake ducts the earliest warning of turbo degradation, before any fault codes appear.

• Critical severityFrequency: OccasionalElectrical systemTwo successive campaigns over a fire risk in the starter motor relay (2025 and 2026)Yes: BMW recalled the 5 Series G30 twice for the same risk in the starter motor relay - which can corrode or build up deposits, overheat and cause a short circuit with a risk of fire - first in September 2025 and again in July 2026 for more recent cars.
• High severityFrequency: RareSteeringWear or failure of the electric steering rackThere are documented cases of electric steering rack failure on the 5 Series G30: gebrauchtwagenberater.de reports its replacement in a long-distance endurance test by BILD magazine, and fiches-auto.fr records a similar case on a 2017 540i.
• High severityFrequency: RareGearbox and clutchJerking and failure of the xDrive transmission on all-wheel-drive versionsfiches-auto.fr documents the complete replacement of the xDrive transmission on a 2017 530d (€5,680 invoiced by BMW and covered by the warranty at 81,000 km); there are no statistics indicating what proportion of cars fail.Repair: €5,680
• Low severityFrequency: OccasionalBodywork and interiorPanoramic roof that creaks, sticks or leaksGebrauchtwagenberater.de and fiches-auto.fr report complaints of panoramic roofs that creak or stick when closing, and the odd isolated case of leaking through the drain channel; there are no figures indicating what proportion of cars suffer from it.