BMW/N47D20

BMW · Sequential twin-turbo

N47D20

1 Series·F20·2012–2015·1,995 cc

"Apart from timing chain failure at 72k, car has run flawlessly. However timing chain remains a massive fault I cannot forgive."

RISKY

42/ 100

"Ticking time bomb at the back"

215

Max HP

450

Torque Nm

10,000

Oil interval km

Recalls

Known issues

Known Issues

Timing Chain Failure (Rear-Mounted)€2,500-6,000 · 60,000-120,000 kmCRITICAL

The N47D20 places the timing chain at the rear of the engine, meaning engine removal is required for replacement. The chain stretches, hops off or snaps, causing catastrophic engine damage. Documented failures as early as 72,000 km. Pre-LCI 2012-2015 units inherited an improved but not fully resolved design over the notorious 2009-2011 versions. This is the single most serious fault on the N47 and must be treated as a mandatory maintenance item.

Rattling or chattering noise on cold start from the rear of the engine

Rough running or misfires

Check engine light with camshaft/crankshaft correlation codes

Engine cuts out or fails to start in severe cases

DIY: Expert only — engine removal required

EGR Cooler Leak / Failure€400-1,200 · 80,000-160,000 kmHIGH

The EGR cooler is subject to cracking and coolant leaks, leading to a DVSA/BMW recall affecting nearly 35,000 BMW and MINI vehicles. Coolant can enter the intake system, causing rough running, white smoke, and potential hydrostatic lock if severe. An optimised replacement part was issued under the recall.

White or grey exhaust smoke

Unexplained coolant loss

Rough idle or hesitation

Coolant smell from intake area

DIY: Hard — requires intake manifold removal

EGR Valve Carbon Buildup / Sticking€200-600 · 80,000-150,000 kmMODERATE

The EGR valve accumulates carbon deposits over time, causing it to stick open or closed. This leads to rough idling, hesitation, and increased fuel consumption. Common on all diesel engines with high EGR activity, particularly on short-run, urban-use vehicles.

Rough idle

Hesitation under acceleration

Increased fuel consumption

EGR-related fault codes (P0400 series)

DIY: Moderate — accessible with basic tools

Turbo Wastegate Actuator Sticking€300-900 · 70,000-140,000 kmMODERATE

The electronically controlled turbo wastegate actuator is prone to sticking due to carbon buildup, causing the wastegate to remain open and preventing the turbo from building boost. Results in noticeable power loss. Documented on forum reports for N47D20 in the F20 chassis.

Significant loss of power and torque

Sluggish performance under load

Boost pressure fault codes

Limp mode activation

DIY: Moderate — turbo access is tight but actuator replacement does not require full removal

Oil Pressure Sensor / Switch Fault€50-200 · 60,000-120,000 kmLOW

Oil pressure warning lights can be triggered by faulty or poorly connected oil pressure sensors rather than actual oil pressure loss. Documented on N47 engines. While often electrical, actual oil pressure should always be verified with a mechanical gauge before dismissing the warning.

Oil pressure warning light at idle on warm engine

Warning light triggered at high RPM

Intermittent low oil pressure alerts

DIY: Easy — sensor replacement is straightforward

Buying Checklist

Cold-start the engine and listen for any rattling or chattering from the rear — this is a timing chain warning sign and a deal-breaker if present

Request full service history with evidence of timing chain replacement; if no record exists, factor €3,000–5,000 into the purchase price

Check the EGR cooler recall status by running the VIN through the DVSA and NHTSA recall databases before purchase

Perform a full OBD diagnostic scan and check for active or stored fault codes related to boost pressure, EGR, and oil pressure

Test drive under full load acceleration — any power loss, hesitation or limp mode activation suggests a wastegate actuator or turbo issue

Inspect coolant level and condition; any milky residue or unexplained coolant loss points to EGR cooler leakage or head gasket involvement

Service Reality

Community oil interval10,000 km

Oil specificationBMW Longlife-04 approved 5W-30 fully synthetic (e.g. Castrol Edge 5W-30 LL or equivalent BMW LL-04 certified oil)

Est. ownership cost (2yr)€1,500–4,500 per year depending on whether timing chain work is outstanding; budget an additional €3,000–6,000 if chain replacement is required

Real mix fuel consumptionNo data

Also Found In

BMW 3 Series E90/E91/E92 (320d)BMW 5 Series E60/E61 (520d)BMW X1 E84 (18d/20d)BMW 3 Series F30 (318d/320d pre-2014)BMW 1 Series E87 (116d/118d/120d)

Buying Advice

The N47D20 in the F20 Pre-LCI is a genuinely capable diesel engine let down by one critical structural flaw: a rear-mounted timing chain that is expensive and labour-intensive to replace. The post-2011 revision reduced but did not eliminate failures, and any example without documented chain replacement should be treated as a ticking clock. Only consider buying if the timing chain work is evidenced in the service history, the EGR recall has been completed, and the price reflects the outstanding risk. In the right hands — with proactive maintenance and realistic budgeting — it can be a rewarding driver, but it is not a worry-free purchase.