The 2021 Supra is essentially a BMW Z4 underneath, sharing the B58 3.0L inline-six (or B48 2.0L four) and ZF 8-speed transmission. Most issues trace back to BMW engineering quirks and some teething problems in early production years.
B58 Engine Coolant Crossover Pipe Leak
Occasional · medium severity
Typical onset: 30,000-60,000 mi
Symptoms: Sweet coolant smell from engine bay, Small puddle under engine after parking, Low coolant warning on dash, Visible seepage at back of cylinder head
Fix: Plastic crossover pipe at rear of head develops hairline cracks. Requires removing intake manifold for access. 4-5 hours labor plus coolant flush. OEM BMW part required.
Estimated cost: $800-1,200
Transmission Oil Cooler Line Failure
Common · high severity
Typical onset: 20,000-50,000 mi
Symptoms: Sudden trans fluid leak pooling under vehicle, Transmission slipping or harsh shifts, Burning smell if fluid contacts exhaust, Check engine light with trans fault codes
Fix: ZF 8HP transmission cooler lines crack at crimp points or o-rings fail. Early 2020-2021 models especially vulnerable. Line replacement is 3-4 hours, but if trans ran low on fluid, internal damage may require rebuild (20-25 hours). Always check fluid level immediately if leak suspected.
Estimated cost: $600-1,000 for lines only; $5,500-8,000 if trans rebuild needed
High-Pressure Fuel Pump Failure (B58 3.0L)
Occasional · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Long crank or no-start condition, Rough idle and misfires under load, Reduced power and limp mode, Fuel pressure fault codes (P0087, P0088)
Fix: BMW's Bosch HPFP can fail internally, starving injectors. Pump is on intake side of engine, 3-4 hours labor. Critical: contaminated fuel accelerates failure—always use top-tier gas. Check for metal shavings in fuel system; if present, injectors may need replacement too.
Estimated cost: $1,200-1,800 pump only; $3,500-5,000 if injectors also damaged
VANOS Solenoid Oil Leaks (B58 3.0L)
Occasional · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Oil seepage at front of valve cover, Slight oil smell or smoke at startup, Rough idle when engine cold, Occasional check engine light for cam correlation
Fix: Variable valve timing solenoids develop external leaks at o-rings. Not urgent but gets messy. Each solenoid is 1.5-2 hours labor; front is easier, exhaust side harder due to heat shields. Replace both at once to save on teardown time. Use OEM seals only.
Estimated cost: $500-900 both sides
Carbon Buildup on Intake Valves (Both Engines)
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Rough idle especially when cold, Hesitation or stumble during acceleration, Reduced fuel economy, Misfires under light throttle
Fix: Direct injection engines = no fuel wash on intake valves. Carbon accumulates over time. Requires walnut blasting or media cleaning of valves with intake manifold removed. 6-8 hours labor. Preventive: Italian tune-ups and occasional fuel system cleaner help but don't eliminate buildup.
Estimated cost: $800-1,400
Starter Motor Relay Failure
Rare · high severity
Symptoms: No crank, no start despite charged battery, Clicking from engine bay when key turned, Dashboard lights normal but starter doesn't engage, Intermittent starting issues that become consistent
Fix: Subject to NHTSA recall—check VIN at Toyota dealer. Relay in starter circuit can fail, leaving you stranded. Dealer replacement is 1-2 hours, covered under recall. If out of recall window, aftermarket relay is cheap but labor is same.
Estimated cost: $0 if recall applies; $250-400 otherwise
Rear Differential Fluid Leak
Occasional · medium severity
Typical onset: 40,000-70,000 mi
Symptoms: Oily residue on rear diff cover or axle seals, Whining noise from rear during turns, Low diff fluid on dipstick or inspection, Clunking on acceleration if severely low
Fix: Cover gasket or axle seals weep on some units. Diff is BMW unit, same as Z4. Gasket replacement is 2 hours, axle seals are 4-5 hours each side. Use BMW LSD fluid only—wrong fluid kills limited-slip clutches. Check fluid level every oil change.
Estimated cost: $400-700 gasket; $800-1,200 per axle seal
Owner tips
Change transmission fluid every 40,000 mi despite 'lifetime fill' claim—ZF 8HP longevity depends on it
Use only BMW-approved 0W-20 oil (LL-01FE spec) and change every 7,500 mi; oil consumption can spike with cheap oil
Top-tier fuel (Shell, Chevron, Mobil) significantly reduces HPFP and carbon issues on B58
Let engine warm to operating temp before sustained high RPM—direct injection hates cold-start beatings
Fantastic driver's car with BMW reliability tax—budget $1,500/year for maintenance beyond basics, and avoid early 2020 production if possible.
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.
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BMW of North America, LLC (BMW) is recalling certain 2021-2023 Toyota Supra, 2022-2023 2 Series Coupe, 2021-2024 5 Series (xDrive), 2021-2022 Z4, 2022-2024 4 Series (Gran Coupe), 2021-2024 4 Series (Convertible and xDrive Convertible), 2021-2023 4 Series (Coupe), 2021-2024 3 Series, 2021-2023 X4, 2021-2024 X3 vehicles. Please see the recall report for a complete list of all models. The engine starter may overheat and catch fire due to wear on an internal component.
Consequence: Fire increases the risk of injury.
Remedy: Dealers will replace the engine starter, free of charge. A letter informing owners of the safety risk was mailed on March 27, 2026. Owners will receive another letter once the remedy is available. Owners may contact BMW customer service at 1-800-525-7417 or Toyota's customer service at 1-800-331-4331. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning March 24, 2026.
BMW of North America, LLC (BMW) is recalling certain 2019-2021 BMW 330i, 2019-2022 BMW Z4, 2020-2022 BMW 530i, X3, X4, Toyota Supra, 2021-2022 BMW 430i, 430i Convertible, and 2022 BMW 230i vehicles. The engine starter relay may corrode, causing the relay to overheat and short circuit.
Consequence: A short circuit in the starter relay may increase the risk of a fire.
Remedy: Owners are advised to park their vehicles outside and away from structures until the remedy is complete. Dealers will replace the engine starter, free of charge. Owner notification letters were mailed February 6, 2026. Owners may contact BMW customer service at 1-800-525-7417. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning November 14, 2025.
ENGINE · 21V598000
2021-08-02
BMW of North America, LLC (BMW) is recalling certain 2020 M340i, M340i xDrive, 540i, 540i xDrive, X3 M40i, 2020-2021 X4 M40i, 745Le xDrive, 2019-2021 Z4 M40i, and 2020-2021 Toyota Supra vehicles. During engine start, the engine management software may cause loss of braking assist. Full mechanical braking (without assist) remains available.
Consequence: Loss of braking assist can increase the risk of a crash.
Remedy: Dealers will update the engine management software, free of charge. Owner notification letters were mailed on September 17, 2021. Owners may contact BMW customer service at 1-800-525-7417.
SEAT BELTS · 21V554000
2021-07-21
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."
Consequence: During a crash, a seat belt retractor that does not function as intended increases the risk of injury.
Remedy: Dealers will inspect the seat belt retractors (including the seat belts) and, if necessary, replace the retractors, free of charge. Owner notification letters were mailed on September 3, 2021. Owners may contact BMW customer service at 1-800-525-7417; 1-866-825-1525 (MINI); 1-877-877-3735 (Rolls Royce); and 1-888-270-9371 (Toyota).
BMW of North America, LLC (BMW) is recalling certain 2020-2021 Z4 and 2020-2021 Toyota Supra vehicles. The weld between the fuel tank halves may have been insufficiently welded, causing the weld to fail.
Consequence: The failed weld may allow fuel to leak, increasing the risk of a fire in the presence of an ignition source.
Remedy: BMW will notify owners, and dealers will replace the fuel tank, free of charge. The recall began December 18, 2020. Owners may contact BMW customer service at 1-800-525-7417 or Toyota customer service at 1-888-270-9371.
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