BMW 6 Series (F12/F13/F06) Common Problems & Reliability
The F12/F13/F06 6 Series replaced the polarising E63 with a genuinely elegant grand tourer, and the 2012 Gran Coupé added four doors and a longer wheelbase. UK buyers mostly chose the 640d, which pairs 313PS with mid-30s economy and makes the car a credible long-distance companion; the 640i petrol and 650i V8 are rarer and far thirstier. It shares the F10 5 Series and F01 7 Series platform, so suspension and electrical faults are familiar BMW fare, but the bills are bigger: adaptive dampers, soft-close latches, LED headlamps and the N63 V8 all cost serious money to put right. Buy a 640d with a full history and working electronics, and treat the V8 cars as a hobby.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common BMW 6 Series (F12/F13/F06) Faults & Repair Costs
N63 V8 Engine Failures
The early 4.4L hot-V twin-turbo V8 in the 650i suffers from extreme thermal stress, leading to hardened valve stem seals, stretched timing chains, cracked turbo coolant hoses, and leaking piezoinjectors that can cause bore wash or hydraulic lock.
Excessive oil consumption exceeding 1 litre per 600 miles, Smoke from exhaust after warm idling, Misfires and "Drivetrain: check engine" warnings
- Check BMW service history for Customer Care Package (CCP) work
- Inspect turbo coolant lines in engine V for brittle plastic and leaks
- Check for Index 11 or 12 fuel injector installation
Adaptive LED Headlight Moisture
The factory sealing beads on the front adaptive LED headlight assemblies can degrade, admitting rainwater and road spray. Condensation inside the lens shorts out the TMS driver modules positioned at the bottom of the housing.
Heavy water droplets on the inside of the headlight lens, "Adaptive Headlight Failure" dash alert, One dipped beam or angel eye ring fails to illuminate
- Inspect both headlight lenses under daylight for internal misting
- Check operation of automatic high-beam assist and steering swivel
Soft Close Door Actuators
The motorized pull-down latches for the optional soft-close doors can experience cable stretch or internal microswitch failure, causing the door to fail to cinch or bounce slightly open instead of latching.
Door fails to pull shut on first latch click, Door ajar warning while driving, Motor buzzing continuously inside door shell
- Gently push each door until it clicks once and ensure the motor cinches it fully closed
- Test all doors on Gran Coupe 4-door variants
EGR Cooler Leak
The twin-turbo N57 diesel engine in the popular 640d is subject to BMW UK recall campaigns for leaking exhaust gas recirculation coolers, which can create intake manifold thermal damage and fire risk.
Gradual coolant loss without external puddles, Burning exhaust or plastic smell under the bonnet, Drivetrain warning or reduced engine power
- Check BMW main dealer recall records for EGR cooler replacement
- Inspect intake manifold around EGR pipe for melting or soot deposits
Buying a used BMW 6 Series (F12/F13/F06)? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.