How much does a BMW 5 Series 518d engine replacement cost in the UK?

A reconditioned 518d engine (N47 or B47) typically costs £1,800–£3,800 supply only depending on engine generation and variant. Fitting adds £1,000–£1,500. Use our calculator for a figure specific to your vehicle.

What are the common problems with the BMW 5 Series 518d?

On the pre‑2014 N47D20C, the most serious issue is timing chain failure – the chain, guides, and tensioners can wear prematurely, causing chain stretch and potential catastrophic engine damage. On the B47, pre‑2018 units can suffer from timing chain tensioner wear causing cold‑start rattle. On both engines, common problems include EGR valve/cooler failure, DPF blockage from urban driving, and oil leaks (valve cover, oil filter housing).

Is it worth replacing a 518d engine, or should I scrap the car?

Depends on vehicle value and condition. Against a tidy £5,000–£15,000 5 Series, a £1,800–£3,800 recon is 12–40% of the car's value – often worth it on well‑maintained examples. If the timing chain has snapped on an N47 and caused valve damage, a full engine replacement may be necessary. Get a full diagnostic assessment before committing.

How do I find my 5 Series's engine code?

The pre‑LCI F10/F11 (2013–2014) uses the N47D20C – check for the rear‑mounted timing chain design. Late F10/F11 (2014–2016) and G30/G31 (2016–present) use B47 variants. The engine code is stamped on the engine block and listed on your V5C.

Can I repair a 518d engine issue, or does it need replacement?

Most issues – timing chain wear (if caught early on N47 or B47 pre‑2018), EGR valve failure, DPF blockage, oil leaks – are repairable. However, if the timing chain has snapped on an N47, the engine is an interference design – pistons will strike valves. In this case, a full engine replacement is usually more cost‑effective than a rebuild.

BMW 5 Series 518d2013–present2.0L Turbo Diesel (N47 / B47)

BMW 5 Series 518d Engine Replacement — Compare Prices & Get Quotes

Name: BMW 5 Series 518d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW specialists. Compare reconditioned, rebuilt and used N47 and B47 2.0‑litre turbo diesel engines for the 5 Series 518d - the efficient, refined entry point to the executive diesel range. Supply & fit available nationwide.

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BMW 5 Series 518d Engines - from £1,200 to £3,800Common codes: N47D20C, B47D20A, B47D20B

BMW 5 Series 518d Engines - from £1,200 to £3,800· Common codes: N47D20C, B47D20A, B47D20B

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BMW 5 Series 518d - Which Engine Does Your Car Actually Have?

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

143 bhp - rear‑mounted timing chain is the defining weakness

GenerationYearsEngine CodeReliabilityRecon CostEra Note

F10/F11

2013–2014N47D20C (2.0L Turbo Diesel I4)★★★½☆ [NEWLY ASSIGNED - see Data Note]£1,800–£3,200 [PLACEHOLDER - confirm vs cost sheet]143 bhp - rear‑mounted timing chain is the defining weakness

F10/F11 (late) BMW 320d F10/F11 (late)

2014–2016B47D20A (2.0L Turbo Diesel I4)★★★★☆ [NEWLY ASSIGNED - see Data Note]£1,800–£3,200 [PLACEHOLDER - confirm vs cost sheet]136 bhp - improved timing chain design

G30/G31

2016–2020B47D20B (2.0L Turbo Diesel I4)★★★★☆ [NEWLY ASSIGNED - see Data Note]£2,000–£3,500 [PLACEHOLDER - confirm vs cost sheet]150 bhp - the most powerful 518d, B47 reliability improvements

G30/G31 (MHEV) BMW 320d G30/G31 (MHEV)

2020–presentB47D20B (2.0L Turbo Diesel I4, MHEV)★★★★☆ [NEWLY ASSIGNED - see Data Note]£2,200–£3,800 [PLACEHOLDER - confirm vs cost sheet]136 bhp - mild‑hybrid, latest B47 evolution

Why use this era map?

This table is the single source every other section on this page must match. Sections 2, 4, and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 5 Series 518d Engine Replacement Costs

Supply Only£1,800–£3,200

Fitted (Indie)£2,800–£4,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,200–£2,200£1,800–£3,2001–6 monthsBudget priority; short‑term ownership

Reconditioned Engine£1,800–£3,200£2,800–£4,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£2,800–£3,800£3,800–£5,20012–24 monthsLong‑term ownership; maximum reliability

Main Dealer New£4,500–£6,500£6,000–£8,00024–36 monthsInsurance jobs; warranty claims; full provenance

Figures above reflect the 518d pricing across generations. The N47 and B47 engines have broadly similar replacement costs, though B47 engines (being newer) may command a slight premium. Older generations: see the Era Map above for generation-specific pricing.

Labour estimate: Fitting a 518d engine typically takes 8–12 hours at £75–£110/hr (independent BMW specialist). The N47's rear‑mounted timing chain adds complexity to engine‑out work.

→ Compare 5 Series 518d engine prices from UK specialists

Common Problems With BMW 320d Engines

1. N47 Timing Chain Failure (F10/F11, 2013–2014)

Symptoms: Cold‑start rattle lasting 1‑3 seconds, metallic ticking from the rear of the engine, rattling persisting when warm, engine warning light, loss of power - catastrophic failure can occur without warning.

Typical mileage: 60,000–100,000 miles.

Repair cost: £1,200–£2,500 [PLACEHOLDER] (timing chain, tensioner, and guide replacement - engine or gearbox removal required).

Replacement cost: £1,800–£3,800 [PLACEHOLDER] (if chain snaps and damages the engine).

🔴 Immediate - if you hear cold‑start rattle, book an inspection immediately.

Our recommendation:

The N47 timing chain is the defining weakness of this engine generation. The chain is mounted at the rear of the engine, against the firewall, making access labour‑intensive. The chain, guides, and tensioners can wear prematurely, causing chain stretch. If the chain stretches too far, it can "jump" a tooth or snap, causing pistons to strike valves in this interference engine. A £1,200–£2,500 preventative chain replacement is far cheaper than a £1,800–£3,800 engine replacement. At the first sign of cold‑start rattle, have the timing system inspected immediately. The B47 (2014‑onwards) addressed these issues with an improved timing chain design.

1. N47 Timing Chain Failure (F10/F11, 2013–2014)

Typical mileage: 60,000–100,000 miles.

Repair cost: £1,200–£2,500 [PLACEHOLDER] (timing chain, tensioner, and guide replacement - engine or gearbox removal required).

Replacement cost: £1,800–£3,800 [PLACEHOLDER] (if chain snaps and damages the engine).

🔴 Immediate - if you hear cold‑start rattle, book an inspection immediately.

Our recommendation:

2. B47 Timing Chain Tensioner Wear (Pre‑2018 B47 Units)

Symptoms: Cold‑start "diesel rattle" - a characteristic rattling noise on cold starts that can escalate into catastrophic chain failure, bent valves, or a seized engine if left unaddressed.

Typical mileage: 60,000–120,000 miles.

Repair cost: £800–£2,000 [PLACEHOLDER] (timing chain tensioner replacement).

Replacement cost: £2,000–£3,800 [PLACEHOLDER] (if chain snaps).

🔴 Immediate - if you hear cold‑start rattle, book an inspection immediately.

Our recommendation:

While the B47 is significantly more robust than the N47, pre‑2018 B47 units remain susceptible to chain tensioner wear, leading to the characteristic "diesel rattle" on cold starts. Left unaddressed, this rattle can escalate into catastrophic chain failure, bent valves, or a seized engine. At the first sign of cold‑start rattle, have the timing system inspected immediately. B47 engines with regular oil changes and proper maintenance can exceed 120,000 miles without major issues.

3. EGR Valve / Cooler Failure (N47 & B47)

Symptoms: Reduced power, rough idle, engine warning light, increased fuel consumption, black smoke from exhaust, failed emissions test.

Typical mileage: 40,000–80,000 miles.

Repair cost: £400–£1,000 [PLACEHOLDER] (EGR valve or cooler replacement).

Replacement cost: N/A - repair only (if caught early).

🟠 Check - book inspection urgently if engine warning light appears.

Our recommendation:

EGR system failure is a common issue on both N47 and B47 diesel engines. The EGR valve can become clogged with soot, and the EGR cooler can develop leaks, leading to coolant loss. Regular motorway driving and using high‑quality diesel can help reduce EGR clogging. If the engine warning light appears with EGR‑related codes, have the system diagnosed promptly.

4. DPF Blockage (Urban Driving)

Symptoms: Reduced power, increased fuel consumption, engine warning light, DPF warning message, failed emissions test, oil level rising (fuel dilution).

Typical mileage: 30,000–80,000 miles (depends on driving patterns).

Repair cost: £400–£1,200 [PLACEHOLDER] (DPF cleaning or replacement).

Replacement cost: N/A - repair only (if caught early).

🟡 Monitor - book inspection soon if DPF warning appears.

Our recommendation:

The 518d's diesel engine is sensitive to driving patterns. If used primarily for short urban trips, the Diesel Particulate Filter (DPF) will clog. Regular motorway runs (30+ minutes at 60+ mph) are essential to maintain the exhaust filtration system. Oil changes every 8,000–10,000 miles are recommended rather than BMW's suggested longer intervals to prolong engine and DPF life.

5. Oil Leaks - Valve Cover & Oil Filter Housing (N47 & B47)

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, visible oil leak from the top or front of the engine.

Typical mileage: 40,000–80,000 miles.

Repair cost: £300–£800 [PLACEHOLDER] (valve cover gasket or oil filter housing gasket replacement).

Replacement cost: N/A - repair only (if caught early; ignored oil loss can lead to engine damage).

🟠 Check - book inspection urgently if oil leak is detected.

Our recommendation:

Both N47 and B47 engines are known for oil leaks from the valve cover gasket and oil filter housing gasket. If the oil filter housing gasket fails, oil can leak onto the serpentine belt, causing it to slip or break - which can then be ingested into the engine through the front crankshaft seal, causing catastrophic failure. If you notice oil spots under your 518d or a burning oil smell, investigate immediately. A £300–£800 gasket replacement is far cheaper than the consequences of a snapped belt.

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BMW 5 Series 518d - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

BMW 5 Series 518d - Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseN47 timing chain wear✅ Yes (if caught early)£1,200–£2,500 [PLACEHOLDER]Catch it early - cheaper than engine replacementN47 timing chain snapped❌ Usually No£1,800–£3,800+Full engine replacement - valve damage is almost certainB47 timing chain tensioner wear✅ Yes (if caught early)£800–£2,000 [PLACEHOLDER]Catch it early - cheaper than engine replacementEGR valve / cooler failure✅ Yes£400–£1,000 [PLACEHOLDER]Worth fixing - common and well‑understood repairDPF blockage✅ Yes£400–£1,200 [PLACEHOLDER]Routine maintenance - always worth doingOil leaks (valve cover / OFHG)✅ Yes£300–£800 [PLACEHOLDER]Essential maintenance - always worth doingMajor internal failure (crank, bearings)❌ Usually No£1,800–£3,800+Full engine replacement often more cost‑effective

Buying This BMW 5 Series 518d? Check These First

Buy If

Full BMW service history with documented oil changes (every 8,000–10,000 miles)
Pre‑2014 (N47D20C): Timing chain inspected and any work documented
2014‑2016 (B47D20A): Timing chain tensioner checked
2016‑2020 (B47D20B): Evidence of regular motorway driving (DPF‑friendly usage)
A well‑maintained example with lower mileage

Avoid If

Pre‑2014 (N47): Any sign of cold‑start rattle - this is the defining weakness
No evidence of regular oil changes - both engines are intolerant of neglect
DPF warnings on the dashboard - indicates urban‑only driving
Poor service history - these engines demand strict maintenance

Closing Verdict

The BMW 518d offers efficient, refined diesel performance in the executive saloon or Touring body. The pre‑2014 N47D20C is a capable engine with a well‑documented Achilles heel: rear‑mounted timing chain failure. The B47 (2014‑onwards) addressed these issues with an improved timing chain design, though pre‑2018 units remain susceptible to tensioner wear. Buy on service history above all else - a vehicle with documented timing chain maintenance and regular oil changes is a safe bet; a neglected example can be expensive to repair.

Don't guess.Get the right engine at the right price.

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Buying Checklist

Before you buy a used BMW 5 Series 518d (or before you commit to an engine replacement), check these:

1. Cold Start

Any rattle for 1‑3 seconds? (N47 timing chain warning - stop immediately)

2. Service History

Regular oil changes (8,000–10,000 miles) - this is non‑negotiable

3. Timing Chain History

Pre‑2014 N47: Has the chain been inspected or replaced?

4. DPF Health

Has the vehicle done regular longer runs? (short trips kill DPFs)

5. EGR System

Any engine warning lights? Any EGR‑related codes?

6. Oil Leaks

Check under the vehicle and around the valve cover and oil filter housing

7. Oil Consumption

Does it use more than 1L per 1,000 miles?

8. MOT History

Check for emissions‑related failures or any advisory notes

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

BMW 320d Engine Codes

This table's rows match Section 1B's Era Map exactly.

N47D20C (2.0L Turbo Diesel I4)

Years2013–2014

Power143 bhp (105 kW) / 360 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£1,800–£3,200 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N47D20C (2.0L Turbo Diesel I4)2013–2014143 bhp (105 kW) / 360 Nm- (pattern data)£1,800–£3,200 [PLACEHOLDER]

B47D20A (2.0L Turbo Diesel I4)2014–2016136 bhp (100 kW) / 320 Nm- (pattern data)£1,800–£3,200 [PLACEHOLDER]

B47D20B (2.0L Turbo Diesel I4)2016–2020150 bhp (110 kW) / 360 Nm- (pattern data)£2,000–£3,500 [PLACEHOLDER]

B47D20B (2.0L Turbo Diesel I4, MHEV)2020–present136 bhp (100 kW)- (pattern data)£2,200–£3,800 [PLACEHOLDER]

Technical Specs

N47D20C / B47D20B - 2.0L Turbo Diesel

Displacement1,995 cc

Cylinders4‑cylinder inline

Compression Ratio16.0:1 (N47) / 16.5:1 (B47)

Fuel SystemCommon‑rail direct injection

AspirationSingle turbocharger with variable geometry

ValvetrainDOHC, 16 valves

→ Compare 5 Series 518d engine prices for your BMW

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Market Intelligence

Most Common Failure

N47: Timing chain failure

the defining weakness of the early 518d

Average Enquiry Mileage

50,000

–80,000 miles

[PATTERN DATA]

Average Replacement Cost

£2,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

N47D20C

the early engine is more common on the used market

Peak Enquiry Season

Autumn/Winter

cold starts expose timing chain wear

Regional Demand

South East22%

London16%

North West (12%) - executive car strongholds

PATTERN DATA

Regional Demand Breakdown

22%South East

16%London

BMW 320d - Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited‑mileage warranty - always confirm terms with your chosen supplier.

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supply‑only or full supply & fit available nationwide, covering every generation of this badge from the F10 facelift through to the latest G30, with specialist knowledge of BMW's entry‑level executive diesel engines.

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