Car Model Guide/ BMW/ 3 Series/ F31/ 320d N47/ Issues

320d N47, known issues

F31 · 2012–2015 · R4 High risk

Recorded issues7

Walk-away1

Over €1,0006

Checkable at viewing4/7

Likely spend€5,850

Likely spend is the mid cost of every issue rated common or universal, added together, what an unmaintained example owes over the next few years, not a prediction for any one car. Worst case if everything here failed at once is €10,200, which isn't a realistic scenario but is a useful ceiling.

All issues, by system

Engine

Rear timing chain failureN47D20€1,500–€2,500

Rattle from the bulkhead end of the engine on start-up and on the overrun, then chain jump and catastrophic valve damage. The timing chain sits at the rear of the block against the bulkhead. The chain and its guides wear early, and the repair requires the engine or gearbox out.

Check: Stand at the rear of the engine bay at a genuinely cold start and listen for rattle. Then demand documentation: a chain replacement with current part numbers, or walk. The repair costs a meaningful fraction of the car's value.

Later parts: Revised chain and sprockets phased in from roughly 2011; coverage was inconsistent, so verify by part number and receipt rather than by build year.

EnginecommonDetectable at viewingwalk away without proofevidence: manufacturer100–200k km

Swirl flap wear and ingestionswirl flaps€400–€900

Often none until it happens. Rough running, then in the worst case an engine destroyed by an ingested flap. The intake manifold's swirl flaps run on spindles that wear. A detached flap can be drawn into a cylinder.

Check: Not visible without removing the manifold. Ask whether the flaps have been removed or the manifold replaced. Many well-kept examples have had this done preventively, and that's a selling point.

EngineoccasionalNot detectable at viewingevidence: documented120–250k km

Transmission

Dual-mass flywheel and clutch wearGetrag six-speed manual€900–€1,600

Rattle at idle with the clutch up that disappears when you press it, judder on pull-away, gearbox rumble. The dual-mass flywheel's springs wear. Diesels and tuned petrols wear them faster.

Check: Idle in neutral with the clutch up and listen, then press the clutch. A rattle that stops when you press is the flywheel. Also check for judder pulling away in first.

TransmissioncommonDetectable at viewingevidence: documented130–250k km

Emissions

DPF clogging and forced regenerationDPF€250–€1,800

Warning light, limp mode, oil level rising above the maximum mark from fuel dilution. The filter needs sustained hot running to regenerate. A car used for short urban trips never completes a regeneration cycle.

Check: Read the DPF soot load and the distance since the last regeneration on a scan tool, and check the engine oil level and smell it for diesel. Ask what the car was used for. A short-trip city diesel is the wrong car regardless of mileage.

EmissionscommonPartly detectableevidence: documented120–250k km

EGR cooler leakEGR cooler€400–€1,000

Coolant loss with no visible external leak, white smoke, sweet smell. The EGR cooler cracks internally and leaks coolant into the intake. BMW recalled affected diesels over a fire risk from glycol deposits igniting.

Check: Check coolant level and look for unexplained top-ups in the service history. Verify the recall was carried out. It's free and searchable by VIN.

EmissionsoccasionalPartly detectableevidence: manufacturer120–250k km

Turbo & intake

Variable-vane turbo actuator stickingvariable-vane turbo€400–€1,200

Sudden loss of power on a hard pull, limp mode that clears on restart, underboost or overboost codes. Soot binds the variable vanes or the actuator linkage seizes.

Check: Do a full-throttle pull in third from 1,500 rpm to the limiter. Hesitation or a drop into limp mode is this fault. Do this twice.

Turbo & intakecommonDetectable at viewingevidence: documented130–250k km

Suspension

Rear air spring leakF31 body€300–€1,200

The rear of the car sitting low after standing, a suspension warning, or a compressor that runs for longer than it should. The Touring's self-levelling rear suspension uses air springs, and their rubber bags perish and crack with age. A leaking spring then makes the compressor work harder until it fails as well.

Check: Look at the car cold and before it's been started, and check that it sits level. Then load the boot and watch it lift back to height, listening for the compressor running on.

SuspensioncommonDetectable at viewingevidence: documented90–180k km

How to read this

Every issue is authored once against the part that actually carries it: the engine, the gearbox, the chassis or a shared component, and inherited by every variant that has that part. The badge next to each issue says where it comes from, so you can tell an N47 problem from an E9x problem.

Evidence tiers. Manufacturer means a recall, technical bulletin or revised part number. Documented means workshop data or multiple independent sources. Reported means owner consensus with no hard confirmation, and never sets a risk level on its own.

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Car Model Guide/ BMW/ 3 Series/ F31/ 320d B47/ Issues

320d B47, known issues

F31 · 2015–2019 · R2 Manageable

Recorded issues4

Walk-away0

Over €1,0004

Checkable at viewing2/4

Likely spend€3,050

Likely spend is the mid cost of every issue rated common or universal, added together, what an unmaintained example owes over the next few years, not a prediction for any one car. Worst case if everything here failed at once is €5,600, which isn't a realistic scenario but is a useful ceiling.