The 2019 740i uses BMW's B58 3.0L turbo inline-six, generally more reliable than the N63 V8, but this G11/G12 7-Series generation suffers from complex electronics, air suspension failures, and transmission cooler issues that can strand you. Early B58 engines also show occasional low-speed pre-ignition (LSPI) damage requiring major internal work.
Transmission Oil Cooler Failure
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid mixing with coolant (strawberry milkshake in expansion tank), Transmission slipping or harsh shifts, Limp mode with trans fault codes, Coolant loss without external leaks
Fix: Replace transmission oil cooler and flush both cooling system and transmission. If contamination occurred, transmission requires full rebuild or replacement. Cooler replacement alone: 4-6 hours labor. With trans damage: 12-18 hours plus core.
Symptoms: Sudden loud knocking or rattling under light acceleration, Check engine light with misfire codes, Metal shavings in oil, Loss of power or rough idle, Catastrophic failure without warning in worst cases
Fix: LSPI events can crack ringlands, damage pistons, or score cylinder walls. Diagnosis requires oil analysis and borescope inspection. Repair ranges from piston/ring replacement (single cylinder: 18-22 hours) to short block replacement (28-35 hours) if multiple cylinders affected. BMW issued software updates to mitigate, but damage is permanent.
Symptoms: Suspension fault warning on iDrive, Vehicle sagging on one corner or entire side, Compressor running constantly (audible whine), Rough ride or inability to adjust ride height, Suspension locked in one position
Fix: Air struts leak at seals or compressor fails from overwork. Each strut replacement: 2-3 hours. Compressor replacement: 3-4 hours. Often multiple corners fail within 10,000 miles of first failure. Many owners convert to coil springs ($2,500-3,500 for all four corners) to avoid repeat failures.
Estimated cost: $1,400-2,200 per strut, $2,800-3,800 (compressor)
Symptoms: No-start condition with crank but no fire, Intermittent stalling while driving, Fuel pump prime cycle not audible on key-on, P0087 low fuel pressure codes, Limp mode or hesitation under load
Fix: The ISM combines fuel pump, level sender, and control module. Failure strand vehicles without warning. Replacement requires tank removal: 6-8 hours labor. Some early 2019s covered by extended warranty campaign, check BMW service history.
Symptoms: Check engine light with thermostat rationality codes, Engine running cooler than normal (below 180°F), Poor heater performance in winter, Increased fuel consumption, Occasional limp mode if ECU detects temp sensor conflict
Fix: B58 uses electronically-controlled thermostat that fails stuck open. Replacement involves coolant drain and partial disassembly of cooling system: 2.5-3.5 hours labor. Use OEM only; aftermarket units fail prematurely.
Estimated cost: $650-1,100
iDrive Head Unit / Infotainment Freezing and Failure
Occasional · low severity
Symptoms: Black screen on startup or while driving, Touchscreen unresponsive, System rebooting randomly, Loss of backup camera or parking sensors, Climate control inoperative (controlled through iDrive)
Fix: Software updates resolve some cases (1 hour diagnosis/programming). Hardware failure requires head unit replacement: 3-4 hours including coding. BMW issued several TSBs for software patches; verify all updates applied before replacing hardware.
Estimated cost: $400-800 (software), $3,200-4,800 (head unit replacement)
Adaptive LED Headlight Module Failure
Occasional · low severity
Typical onset: 40,000-80,000 mi
Symptoms: Headlight adaptive function error on dash, One or both headlights stuck in one position, Flickering or intermittent light output, High beam assist malfunction, Moisture inside headlight housing
Fix: Control modules inside headlight assemblies fail from heat cycling. Entire headlight assembly replacement required (modules not sold separately): 1.5-2 hours per side. Coding required after installation.
Estimated cost: $2,200-3,500 per headlight
Owner tips
Use BMW-approved low-SAPS 0W-20 oil only and change every 7,500 miles maximum to reduce LSPI risk—avoid extended intervals despite BMW's 10k recommendation
Check coolant reservoir weekly for contamination (pink/red swirls) indicating transmission cooler failure before trans is damaged
Budget $2,000-3,000/year for air suspension maintenance after 60k miles or plan coil conversion before first failure
Verify all BMW service campaigns and software updates completed (especially fuel pump and LSPI calibration updates)
Inspect oil at every fill-up for metal flakes or unusual color during first 80k miles—early warning of B58 internal damage
Buy with caution: budget $5,000+ for first-year deferred maintenance and keep $3,000 emergency fund for transmission cooler or LSPI repair—excellent highway cruiser when sorted, but complexity makes DIY repair impractical and shop bills eye-watering.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: AGM battery required; located in trunk/cargo area; battery registration required after replacement
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Every control module on the 2018-2021 BMW 740i — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Basic VIN coding; most aftermarket tools can perform
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
BMW of North America, LLC (BMW) is recalling certain 2018 BMW 540d xDrive vehicles. The crankshaft sensor may be equipped with incorrect firmware, preventing the sensor from properly processing input from the crankshaft reluctor ring, possibly resulting in a vehicle stall.
On September 12, 2018, BMW expanded the recall to a total of 5,309 vehicles including certain 2018-2019 BMW 540d xDrive, 230i M240i, M240i xDrive, X2 sDrive28i, X2 xDrive28i, X1 sDrive28i, X1 xDrive28i, 330i, 330i xDrive, 340i, 340i xDrive, 330i xDrive Gran Turismo, 530i, 530i xDrive, 540i, 540i xDrive, 530e, 530e xDrive, 640i xDrive Gran Turismo, 330e, 2019 430i Gran Coupe, 430i xDrive Gran Coupe, 440i Gran Coupe, 440i xDrive Gran Coupe, 430i, 430i xDrive, 440i, 440i xDrive, 740i, 740i xDrive, MINI Cooper, Cooper S, JCW, MINI Countryman (Cooper, Cooper All4, Cooper S, Cooper S All4, JCW All4), and MINI Clubman (Cooper, Cooper S, Cooper All4, Cooper S All4, JCW All4) vehicles.
Consequence: A vehicle stall can increase the risk of a crash.
Remedy: BMW will notify owners, and dealers will replace the crankshaft sensor, free of charge. The recall began September 6, 2018. Owners may contact BMW customer service at 1-800-525-7417.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2019 BMW 740i 3.0L I6 Turbo B58 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.