BMW/N47D20

BMW · Sequential twin-turbo

N47D20

1 Series·F20·2011–2015·1,995 cc

"The timing chain and EGR are not if but when — budget accordingly or walk away."

RISKY

42/ 100

"Cheap to buy, expensive to regret"

215

Max HP

450

Torque Nm

10,000

Oil interval km

Recalls

Known issues

Known Issues

Timing Chain Wear & Failure€1,500-4,000 · 80,000-180,000 kmCRITICAL

The N47 is notorious for timing chain stretch and failure, predominantly at the rear of the engine where the chain sits. Early 2009-2011 units were worst affected, but the F20 pre-LCI generation (2011-2015) remains at significant risk. A worn chain can hop off or snap, causing catastrophic engine damage. The rear-mounted chain means labour costs are extreme as the engine must come out.

Cold start metallic rattle from rear of engine

Rough idle on cold start

Timing-related fault codes

Chain rattle that fades as engine warms

DIY: Expert only

Oil Pressure Loss / Oil Pump Failure€800-3,000 · 100,000-200,000 kmCRITICAL

Multiple forum reports confirm low oil pressure warnings on the N47D20. Oil pressure at operating temperature has been recorded dropping to dangerously low levels under load. In some cases the oil pump or associated components are implicated. A low oil pressure warning on this engine often means damage has already occurred, including big-end bearing failure.

Red oil pressure warning light

Ticking or rattling noise from engine

Oil pressure gauge reading below 1.5 bar at operating temperature under load

Engine knocking

DIY: Advanced

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

EGR cooler failures are widespread on the N47. BMW issued recalls covering nearly 35,000 vehicles for potential EGR cooler leaks. Coolant can enter the intake or combustion chamber. Forum data confirms repeated dealer visits and eventual EGR cooler replacement as the fix. EGR valves also clog, triggering DPF and EGR fault codes.

EGR-related fault codes (e.g. 290900)

Coolant loss without visible external leak

White smoke from exhaust

Rough running or reduced power

DPF and EGR dashboard warnings

DIY: Intermediate

DPF Blockage & EGR Valve Clogging€300-1,500 · 80,000-150,000 kmHIGH

Forum data shows the N47D20 in F20 applications suffers from DPF and EGR-related fault accumulation, particularly on vehicles used for short urban journeys where active regeneration cannot complete. EGR valve carbon build-up restricts flow and triggers multiple fault codes, requiring valve cleaning or replacement.

DPF warning light

Multiple EGR fault codes

Increased fuel consumption

Reduced power or limp mode

Excessive black smoke

DIY: Intermediate

Turbocharger Cracking / Oil Feed Issues€800-2,500 · 100,000-180,000 kmMODERATE

Owner reports reference turbo casing cracking and oil leaks associated with the turbocharger on this engine family. Given the sequential twin-turbo setup and the engine's sensitivity to oil pressure, any neglect of oil service intervals accelerates turbo wear.

Oil leak near turbo

Blue or white smoke under boost

Whistling or whining from turbo

Loss of boost pressure

DIY: Advanced

Big-End Bearing Failure€1,500-4,500 · 120,000-220,000 kmMODERATE

Forum posts confirm instances of spun big-end journal bearings on the N47D20, often linked to low oil pressure episodes or extended oil change intervals. Once a bearing is run, the crankshaft must be removed and reground, making this a costly repair.

Deep knocking from lower engine

Oil pressure warnings preceding knock

Metallic rattle or rumble under load

DIY: Expert only

Crank / No-Start (Fuel System Related)€200-800 · 80,000-180,000 kmLOW

Isolated forum reports of crank no-start conditions on the N47. Fuel supply pressure and rail pressure have been checked as part of diagnosis. Cause not always definitive but worth checking fuel pump, high-pressure pump, and injectors on high-mileage examples.

Engine cranks but will not fire

Intermittent no-start

Fuel-related fault codes

DIY: Intermediate

Buying Checklist

Cold-start the engine and listen carefully for any metallic rattle from the rear — walk away if present, as timing chain replacement is costly

Connect an OBD scanner and check for EGR, DPF, oil pressure, and timing-related fault codes before purchase

Request full service history and confirm oil was changed every 10,000 km or less with BMW LL-04 approved 5W-30

Check live oil pressure via diagnostics — pressure should not drop below 2 bar at warm idle or below 3 bar under load

Verify all three NHTSA/DVSA recalls have been completed by the dealer, particularly the EGR cooler recall

Inspect coolant level and condition for signs of oil contamination or unexplained coolant loss indicating EGR cooler failure

Service Reality

Community oil interval10,000 km

Oil specificationBMW Longlife-04 5W-30 (e.g. Castrol Edge 5W-30 LL or equivalent meeting BMW LL-04)

Est. ownership cost (2yr)€1,200–3,500 per year depending on mileage and whether timing chain or EGR work is required

Real mix fuel consumptionNo data

Also Found In

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Buying Advice

The BMW N47D20 in the F20 1 Series is a capable diesel let down by well-documented structural weaknesses, principally the rear-mounted timing chain and EGR cooler failures. Only buy a pre-inspected example with a full documented service history, ideally from a BMW specialist rather than a general dealer. Budget a minimum of €1,500-2,000 as an immediate contingency fund for timing chain work if history is absent or unclear. Avoid any example with a cold-start rattle, unexplained coolant loss, or a stack of EGR and DPF fault codes — these are not cheap problems to fix.