Generations
F32 — First Generation (F32/F33/F36)
2013–2020
2.0 TwinPower Turbo, 2.0 TwinPower Turbo (revised), 3.0 TwinPower Turbo, 3.0 TwinPower Turbo (revised), 2.0d, 2.0d (revised)
F82 — M4 (F82/F83)
2014–2020
3.0 M TwinPower Turbo
G82 — Second Generation M4 (G82/G83)
2021–2024
3.0 M TwinPower Turbo
Top issues to watch for
The most serious BMW 4 Series problems ranked by severity. We track 12 known issues — here are the ones you need to know about first.
The crankshaft hub bolt on S55 engines can loosen over time, allowing the timing gear to slip relative to the crankshaft position. This destroys valve timing and can cause catastrophic internal damage if not caught early. 2014-2016 models are most affected due to inadequate thread locking compound from the factory. BMW issued a service action to inspect and re-torque the hub bolt with improved threadlocker, but not all cars have been updated. This is the most serious documented failure mode on the S55 engine.
What happens if ignoredIf the hub slips significantly, valve timing becomes incorrect and pistons can contact valves, destroying the engine beyond economical repair. A complete engine rebuild typically costs £8,000-£15,000. Early detection allows preventive bolt retorquing for under £500. The car should not be driven if timing slip is suspected.
The S55 engine consumes oil at higher rates than typical BMW engines, particularly under sustained high-RPM operation such as track driving. The rod bearings can show premature wear patterns, especially in cars driven aggressively or on track. This is documented across the S55 engine family and appears related to oil supply dynamics under high-G cornering and sustained high RPM. Regular oil analysis is recommended to monitor bearing condition before audible knock develops.
What happens if ignoredProgressive bearing wear leads to oil pressure loss, eventual bearing seizure, and engine destruction. A full engine rebuild with new bearings costs £5,000-£8,000. Early detection allows bearing replacement for £2,000-£3,000. Oil consumption itself requires regular monitoring and top-ups to prevent oil starvation damage.
The S55 cooling system is stressed by the high heat output of the twin-turbo engine and can fail in multiple ways. The electric water pump can fail without warning, the expansion tank and plastic coolant fittings crack from heat cycling, and the system struggles to maintain temperatures during sustained high-load operation such as track driving. The high-pressure cooling system makes leaks particularly serious as coolant loss is rapid once a failure occurs.
What happens if ignoredElectric water pump failure causes immediate overheating and can destroy the engine if not caught quickly. Expansion tank or hose failure leads to rapid coolant loss and potential engine damage. Repair costs range from £300 for hose replacement to £1,500 for complete pump and associated component replacement. Overheating damage can require engine rebuild.
Independent garage
£300–£800
NHTSA 24V-608
The dual-clutch transmission (DCT) in the M4 uses two clutch packs that can wear prematurely under aggressive driving conditions. Early symptoms include judder during low-speed engagement and slipping under hard acceleration. The DCT cooling system can also struggle during track use, leading to overheating and protective power reduction. This is a known limitation of the M-DCT system when used in high-performance applications beyond normal road driving.
What happens if ignoredWorn clutch packs cause transmission slipping and eventual complete failure requiring clutch replacement. A full DCT clutch service costs £2,000-£5,000 depending on the extent of wear. Overheating can damage transmission internals requiring additional repairs. The car remains drivable with mild clutch wear but performance is reduced.
8 more known issues tracked
Including further major faults, wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a BMW 4 Series →
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the BMW 4 Series fails at a significantly higher rate than the average car.
Wheel with a loose or missing wheel nut, bolt o...
Wheels · 80-100k miles
MOT failure rate: 10x the fleet average
Sample: 529 tests
Tyre cords visible or damaged
Tyres · 20-40k miles
MOT failure rate: 6.3x the fleet average
Sample: 190 tests
Tyre seriously damaged
Tyres · 100-120k miles
MOT failure rate: 5.1x the fleet average
Sample: 213 tests
Technical service bulletins & recalls
Official manufacturer notices issued to dealerships. If a car hasn't had recall work done, it needs doing — check with the dealer network.
BMW SB-11-02-16-0001
Engine Coolant Pump Replacement
Electric water pump failure causing overheating. Replacement pump has revised impeller design. Check if pump has been updated on pre-2017 cars as failure rate was high on original specification pumps.
F32 · N20, N55 · Issued: 2016-02
Buying a BMW 4 Series?
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BMW 4 Series reliability FAQs
What are the most common problems with the BMW 4 Series?
The BMW 4 Series has 12 known issues across 4 severity levels. The most serious are: Crank hub failure (2014-2016 worst) (F82).
Is the BMW 4 Series reliable?
The BMW 4 Series has 1 dangerous and 7 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix BMW 4 Series problems?
Costs vary by issue. Independent garages are typically 30-50% cheaper than main dealers for most repairs.
Which BMW 4 Series generation is most reliable?
The F32 (2013–2020) has the fewest dangerous issues (0). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.