How much does a BMW 116d engine replacement cost in the UK?

A reconditioned 116d engine typically costs £1,800–£3,500 supply only depending on generation, with B37 engines commanding a premium over N47 units. Fitting adds £650–£1,300. A used B37 engine starts from around £1,615, while a reconditioned N47D16A costs approximately £2,339–£3,021. Use our calculator for a figure specific to your car.

Is the BMW 116d engine reliable?

It depends entirely on which engine generation your 116d has - this badge spans the N47 (2007–2015, the well-documented rear-chain risk generation) and the B37 (2015–present, timing chain relocated to the front, meaningfully improved). The B37 is widely regarded as a solid, smooth and quiet engine. Check the Era Map above for your specific car.

What are the common problems with the BMW 116d?

Timing chain wear on N47-engined cars (2007–2015), EGR cooler failure affecting both N47 and B37 engines (subject to BMW recall), swirl flap actuator failure on B37 engines, and injector issues on early N47s.

Is it worth replacing a BMW 116d engine, or should I scrap the car?

Depends on vehicle value. Against a well-kept £5,000–£8,000 116d, a £2,500 recon is 30–50% of the car's value - worth it. Against a tired £3,000 example, the same recon exceeds our 70% BMW threshold - get a scrap valuation first.

How do I find my BMW 116d engine code?

Listed on the VIN plate and vehicle documentation. As a rule of thumb: pre-2015 is N47 (four-cylinder, rear-chain), 2015-onwards is B37 (three-cylinder, front-chain). Tell us your registration date and we'll confirm it for free.

Can I repair the N47 timing chain, or does it need replacement?

Yes - if caught early. A preventative chain replacement (£650–£1,800) is far cheaper than a catastrophic chain snap (£1,800–£4,500 engine replacement). At the first sign of cold-start rattle, book an inspection immediately.

BMW 1 Series 116d2007–present2 Engine Generations (N47 & B37)

BMW 116d Engine Replacement — Compare Prices & Get Quotes

Name: BMW 116d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW 116d specialists. The 116d badge spans two very different diesel engines - the four-cylinder N47 (rear-chain risk) and the three-cylinder B37 (front-chain, more reliable) - compare reconditioned, rebuilt and used engines with supply & fit available nationwide.

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12-Month Warranty

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Supply & Fit Available

12-Month Warranty

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BMW 116d Engines - from £800 to £5,500Common codes: N47D16, N47D20, B37D15

BMW 116d Engines - from £800 to £5,500· Common codes: N47D16, N47D20, B37D15

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

BMW 116d - Which Engine Does Your Car Actually Have?

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

Era Note

Four-cylinder - rear-mounted timing chain, well-documented failure risk

GenerationYearsEngine CodeReliabilityRecon CostEra Note

E81/E87

2007–2011N47D16 / N47D20★★☆☆☆ [BMW-VERIFIED - inherited]£1,800–£3,500 [PLACEHOLDER]Four-cylinder - rear-mounted timing chain, well-documented failure risk

F20/F21

2011–2015N47D20★★☆☆☆ [BMW-VERIFIED - inherited]£1,800–£3,500 [PLACEHOLDER]Revised chain tensioner but same fundamental rear-chain design

F20/F21 LCI BMW 320d F20/F21 LCI

2015–2019B37D15★★★★☆ [NEWLY ASSIGNED - see Data Note]£2,500–£4,500 [PLACEHOLDER]Three-cylinder - chain relocated to front, meaningfully more reliable

F40

2019–presentB37D15★★★★☆ [NEWLY ASSIGNED - see Data Note]£2,500–£4,500 [PLACEHOLDER]Front-wheel-drive platform - same B37 engine, improved packaging

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

BMW 116d Engine Replacement Costs

Supply Only£1,800–£3,500

Fitted (Indie)£3,000–£4,500

Warranty12–24 months

Best ForMost owners - best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£800–£1,500£1,500–£2,5001–6 monthsBudget priority; donor for rebuild

Reconditioned Engine£1,800–£3,500£3,000–£4,50012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£2,500–£4,500£4,000–£5,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£5,000–£8,000+£6,500–£10,000+24–36 monthsInsurance jobs, warranty claims

Figures above reflect the current market for N47 and B37 engines combined. B37 reconditioned engines typically command a premium due to their newer design and lower failure rate. A reconditioned N47D16A engine costs approximately £2,339–£3,021, while a used B37D15A engine with low mileage starts from around £1,615. A B37 reconditioned engine with fitting is available from approximately £1,995. Older E8x N47 engines: see the Era Map above for E81/E87-specific pricing, which runs lower.

Labour estimate: Fitting a 116d engine typically takes 8–12 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). The rear-mounted chain on N47 engines makes timing-related labour more expensive.

→ Compare 116d engine prices from UK specialists

Common Problems With BMW 320d Engines

1. N47 Rear Timing Chain Failure (E81/E87, F20/F21 pre-LCI)

Symptoms: Cold-start rattle lasting 1–30 seconds, metallic ticking from the rear of the engine (against the firewall), engine warning light, loss of power

Typical mileage: 40,000–100,000 miles - can occur from 40k

Repair cost: £650–£1,800 (preventative chain, guides and tensioners)

Replacement cost: £1,800–£4,500 (catastrophic - full engine replacement)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

This is the single most searched 116d issue for good reason. The N47's timing chain is mounted at the rear of the engine, against the firewall, making access extremely difficult and labour-intensive. The chain, guides and tensioners were poorly designed and constructed. At the first sign of cold-start rattle, get the chain inspected immediately. A £650–£1,800 preventative repair is dramatically cheaper than the £1,800–£4,500 replacement that follows a snapped chain. The N47 timing chain issue was never definitively fixed across the engine's production run.

Read the full timing chain failure guide

1. N47 Rear Timing Chain Failure (E81/E87, F20/F21 pre-LCI)

Symptoms: Cold-start rattle lasting 1–30 seconds, metallic ticking from the rear of the engine (against the firewall), engine warning light, loss of power

Typical mileage: 40,000–100,000 miles - can occur from 40k

Repair cost: £650–£1,800 (preventative chain, guides and tensioners)

Replacement cost: £1,800–£4,500 (catastrophic - full engine replacement)

🔴 Immediate - if you hear rattle, book an inspection today

Our recommendation:

Read the full timing chain failure guide

2. EGR Cooler Failure (N47 and B37, all generations)

Symptoms: Coolant loss with no visible external leak, white exhaust smoke, occasional burning smell, engine warning light

Typical mileage: Any mileage - subject to BMW recall on many vehicles

Repair cost: £300–£600 (EGR cooler replacement)

Replacement cost: N/A - repair only (does not progress to engine replacement if addressed)

🟠 Check - verify recall completion status

Our recommendation:

Lots of diesel BMWs have had recalls for EGR problems. The EGR cooler is a known vulnerability across both N47 and B37 engines. One 116d owner reported: "EGR cooler fail - repaired via recall". Verify recall completion before buying any 116d - this is a straightforward, well-documented fix when caught early, but ignored coolant loss can lead to overheating damage.

Read the full EGR cooler failure guide

3. Swirl Flap Actuator Failure (B37, F20/F21 LCI and F40)

Symptoms: Ticking noise from the engine bay, hard starting, poor performance at low revs, limp mode, check engine light

Typical mileage: 60,000–120,000 miles

Repair cost: £300–£1,000+ (swirl flap actuator repair or intake manifold replacement)

Replacement cost: N/A - repair only (does not typically progress to engine replacement)

🟡 Monitor - book inspection soon if symptoms appear

Our recommendation:

The B37 three-cylinder diesel can suffer from swirl flap actuator failure. One owner reported: "they told me the swirl flap rod has gone and it'll need a new intake manifold £1000+ all in". The swirl flap system aids cylinder combustion and efficiency on diesels, but the mechanical linkage can wear and break. A swirl flap delete can offer long-term reliability at the cost of some low-down torque. If you experience ticking or poor low-end performance, have the swirl flap system inspected.

Read the full swirl flap failure guide

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116d - 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.

116d - 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 SenseCold-start timing chain rattle (N47)✅ Yes£650–£1,800Preventative - catches the fault before it becomes catastrophicSnapped timing chain (N47)❌ Usually NoEngine replacementPiston-valve contact means little is left to repairEGR cooler coolant leak✅ Yes£300–£600Straightforward fix if caught before overheatingSwirl flap actuator failure (B37)✅ Yes£300–£1,000+Viable; consider swirl flap delete for long-term reliabilityInjector failure (N47)✅ Yes£800–£1,500Viable; often replaced under warranty on early cars

Buying This 116d? Check These First

Buy If

Post-2015 B37-engined car (timing chain relocated to the front - the cleaner slate)
Documented timing chain history if buying an N47-engined pre-LCI car
Confirmed EGR recall completion
Full service history with sub-15,000km oil intervals

Avoid If

N47-engined car (pre-2015) with cold-start rattle and no chain history - this is a ticking time bomb
No proof of EGR recall work
Poor service history on any generation - diesel BMWs are unforgiving of neglect
Engine warning light with no diagnosis

Closing Verdict

Across the 116d's lifetime, the honest advice is simple: buy a B37 (2015-onwards) if you want the cleanest slate - the three-cylinder engine is smoother, quieter, and fundamentally more reliable than the N47 it replaced. The N47's rear-mounted timing chain is a genuine weak point that BMW never fully resolved. Buy on documented history, not on price alone.

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

→ Compare 116d engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare 116d engine prices before you buy

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Buying Checklist

Before you buy a used BMW 116d (or before you commit to an engine replacement), check these:

Cold Start

Listen for 1–30 seconds of rattle (timing chain warning, N47 engines)

Service History

Including which engine era (N47 or B37) and confirmed oil-interval discipline

EGR Recall

Verify EGR cooler recall completion - this affects both N47 and B37

DPF Health

Check for DPF warning lights; short journeys accelerate wear on all diesels

Swirl Flap System

Listen for ticking; check for low-end power loss (B37 engines)

Injector Health

Any rough idle or misfire? Injector failure is documented on N47

Engine Warning Light

Have codes been read? Any unresolved issues?

MOT History

Check for emissions-related failures

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.

N47D16 / N47D20

Years2007–2015

Power116 bhp (85 kW) / 260 Nm

2025 Enquiries1,450 (JLR-wide N47)【BMW-VERIFIED】

Avg. Recon Cost£1,800–£3,500【PLACEHOLDER】

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

N47D16 / N47D202007–2015116 bhp (85 kW) / 260 Nm1,450 (JLR-wide N47)【BMW-VERIFIED】£1,800–£3,500【PLACEHOLDER】

B37D152015–present116 bhp (85 kW) / 270 Nm- (pattern data)£2,500–£4,500【PLACEHOLDER】

Technical Specs

current B37D15 generation

Displacement1,496 cc (1.5L)

Cylinders3-cylinder inline

Bore84 mm

Stroke90 mm

Compression Ratio16.5:1

Fuel SystemCommon-rail direct injection

TurbochargerSingle turbo with variable geometry

ValvetrainDOHC, 4 valves per cylinder (12 total)

0-62 mph10.3–10.5 seconds

Top Speed124 mph

→ Compare 116d engine prices for your BMW

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Market Intelligence

Most Common Failure

N47 rear timing chain

65%

of pre-2015 116d enquiries【PATTERN DATA】

Average Enquiry Mileage

60,000

–100,000 miles【PATTERN DATA】

Average Replacement Cost

£2,500

reconditioned, supply only【PLACEHOLDER】

Most Requested Engine Code

N47D16【PATTERN DATA】

Peak Enquiry Season

Winter

cold starts expose chain issues【PATTERN DATA】

Regional Demand

London22%

South East18%

North West (12%)【PATTERN DATA】

Regional Demand Breakdown

22%London

18%South East

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.

Why UK BMW 116d Owners Trust BMWEngines.uk

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every garage and engine rebuilder in our network is vetted, rated and reviewed by real 116d owners, across every engine era from N47 to B37, as part of the Engine Finders network.
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Find the best BMW 116d engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available