BMW 4 Series 418d2013–20202 Engine Generations

BMW 4 Series 418d Engine Replacement —Compare Prices &
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Name: BMW 4 Series 418d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

The 418d is BMW's entry-level 4 Series diesel — powered by the N47 four-cylinder from launch, then the improved B47 from 2015. Get quotes from trusted UK BMW specialists for both eras, supply & fit available nationwide.

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

Supply &Fit Available
12-MonthWarranty
NationwideDelivery
20+Specialists

BMW 4 Series 418d Engines — from £1,200 to £6,500Common codes: N47D20U1, B47D20A

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100% Free
Reconditioned
Rebuilt
Used
Supply & Fit Available
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The 418d Through Time — Era Map

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

Era Note

Rear-mounted timing chain — the defining N47 weakness

Era Note

Modular B47 — improved chain design, EGR/DPF remain issues

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
F32/F33/F36 (early)	2013–2015	N47D20U1		£2,200–£4,500[PLACEHOLDER]	Rear-mounted timing chain — the defining N47 weakness
F32/F33/F36 (late)	2015–2020	B47D20A		£2,800–£6,500[PLACEHOLDER]	Modular B47 — improved chain design, EGR/DPF remain issues

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 UKCost Data
VerifiedReliability
ExpertInsights
Updated for2025

BMW 4 Series 418d Engine Replacement Costs

Supply Only£2,200 – £5,500
Fitted (Indie)£3,200 – £7,000
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

Engine Type	Supply Only	Fitted (Indie)	Warranty	Best For
Used Engine	£1,200 – £2,500	£2,000 – £3,800	1–6 months	Budget priority; short-term ownership
Reconditioned Engine	£2,200 – £5,500	£3,200 – £7,000	12–24 months	Most owners — best cost/warranty balance
Rebuilt Engine	£3,500 – £6,500	£4,500 – £8,000	12–24 months	Long-term ownership; 3+ year horizon
Main Dealer New	£6,000 – £9,000	£7,500 – £11,000	24–36 months	Insurance jobs, warranty claims

Figures above reflect the current B47 generation, the most common quote request today. Older N47 generations: see the Era Map above for era-specific pricing, which runs lower. Rebuilt N47D20C units for F32/F33 chassis (2012–2020) are available with 12-month warranty options, saving up to 60% vs dealership.

Labour estimate: Fitting a 4 Series 418d engine typically takes 10–14 hours at £65–£95/hr (independent). N47 engines require additional labour due to the rear-mounted timing chain access — it's an engine-out job.

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Common Problems With BMW 4 Series 418d Engines

1. N47 Timing Chain Failure(Early 418d, 2013–2015)

Symptoms: Rattling noise from the engine on cold start, metallic ticking, engine warning light, loss of power. The chain can snap without warning.
Typical Mileage: 60,000–100,000 miles — failures have been reported from as little as 62,000 miles.
Repair Cost: £1,200–£3,000 (chain, tensioner, guides).
Replacement Cost: N/A — repair only if caught early; catastrophic failure requires full engine replacement.
Urgency: Immediate — if you hear rattle, book an inspection today.

Our recommendation:

The N47's timing chain is mounted at the rear of the engine, making access impossible without removing the engine entirely. The chain's role is to synchronise the pistons and valves — if it snaps, the inlet and exhaust valves collide with the pistons, resulting in massive engine damage including blown pistons, bent valves, and shattered rocker arms. It is recommended to replace the timing chain after 100,000 km, but symptoms may appear sooner. At the first sign of cold-start rattle, book an inspection immediately.

1. N47 Timing Chain Failure(Early 418d, 2013–2015)

Symptoms: Rattling noise from the engine on cold start, metallic ticking, engine warning light, loss of power. The chain can snap without warning.
Typical Mileage: 60,000–100,000 miles — failures have been reported from as little as 62,000 miles.
Repair Cost: £1,200–£3,000 (chain, tensioner, guides).
Replacement Cost: N/A — repair only if caught early; catastrophic failure requires full engine replacement.
Urgency: Immediate — if you hear rattle, book an inspection today.

Our recommendation:

2. EGR Cooler Failure(N47 and B47)

Symptoms: Coolant loss with no visible external leak, white exhaust smoke, engine warning light, in severe cases, smouldering particles and fire risk.
Typical Mileage: Any mileage — BMW recalled 1.6 million diesel vehicles globally over EGR cooler fire risk.
Repair Cost: £400–£1,200 (EGR cooler replacement with updated component).
Replacement Cost: N/A — repair only; ignoring coolant loss can lead to overheating and engine damage.
Urgency: Immediate — if the coolant warning comes on, pull over immediately.

Our recommendation:

Glycol leakage from the EGR cooler can occur, and in combination with soot deposits and high temperatures, this might result in smouldering particles. BMW's recall covers vehicles manufactured between May 2013 and July 2017. Check whether your 418d has had the recall work completed. Reconditioned engines for the 418d include updated EGR components designed to prevent the carbon buildup that specifically affects 4 Series 418d models.

3. DPF Clogging(N47 and B47)

Symptoms: DPF warning light, reduced performance, poor fuel economy, increased regeneration frequency, engine warning light.
Typical Mileage: 60,000–120,000 miles — accelerated by short urban journeys.
Repair Cost: £400–£1,200 (DPF clean or forced regeneration).
Replacement Cost: N/A — repair only; ignoring DPF issues can lead to turbocharger damage.
Urgency: Monitor — book inspection soon if DPF warning appears.

Our recommendation:

The 418d's DPF is sensitive to short journeys — the filter requires regular motorway runs to allow passive regeneration. If you primarily drive in town, the DPF will clog faster. A forced regeneration or DPF clean can restore function, but if ignored, the turbocharger can be damaged by excessive back pressure. Some owners report a high-speed noise above 60mph that may be linked to DPF or turbo issues.

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4 Series 418d — Repair, Buy, or Replace?

Not every issue means a new engine.Here’s what can be repaired, when it makes sense, and what to check before you buy.

Can It Be Repaired?

Problem	Repairable?	Typical Cost	When It Makes Sense
N47 timing chain rattle	Yes (if caught early)	£1,200 – £3,000	Preventative — catches fault before catastrophic failure
EGR cooler failure	Yes	£400 – £1,200	Recall may cover it — check with BMW first
DPF clogging	Yes	£400 – £1,200	Forced regeneration or clean — do it when warning appears
Snapped N47 timing chain	Usually No	Engine replacement	Interference engine — piston-valve contact means little is left to repair
B47 turbocharger failure	Sometimes	£1,500 – £3,000	Viable if the rest of the vehicle is solid

ProblemRepairable? · Typical Cost

N47 timing chain rattle

Yes (if caught early)£1,200 – £3,000

Preventative — catches fault before catastrophic failure

EGR cooler failure

Yes£400 – £1,200

Recall may cover it — check with BMW first

DPF clogging

Yes£400 – £1,200

Forced regeneration or clean — do it when warning appears

Snapped N47 timing chain

Usually NoEngine replacement

Interference engine — piston-valve contact means little is left to repair

B47 turbocharger failure

Sometimes£1,500 – £3,000

Viable if the rest of the vehicle is solid

Buying This 418d? Check These First

Buy if:

2015+ B47 with EGR recall completed — improved reliability over the N47
N47 with documented timing chain replacement (especially over 60,000 miles)
Full service history with oil changes every 8,000–10,000 miles
Regular motorway driving history (DPF-friendly)

Avoid if:

Pre-2015 N47 with cold-start rattle and no chain history — the rear chain is an engine-out job
No proof of EGR recall completion on any 418d
DPF warning light or evidence of DPF issues
Poor service history — both N47 and B47 are sensitive to oil quality

Closing verdict

The 418d is BMW's entry-level 4 Series diesel — it offers excellent fuel economy (up to 62 mpg) but comes with well-documented diesel engine vulnerabilities. The N47 (pre-2015) is the riskier buy — timing chain failure is common and expensive to fix. The B47 (2015+) is significantly improved, but EGR cooler and DPF issues remain. With the 70% BMW scrap threshold, a £4,000 recon on a £6,000 418d is 67% — borderline. On a sub-£5,000 example, think carefully.

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Buying Checklist

Before you buy a used BMW 4 Series 418d (or before you commit to an engine replacement), check these:

1. Cold Start
Listen for rattling on startup (N47 timing chain warning)
2. Service History
Including which engine era (N47/B47) and confirmed oil-interval discipline
3. Recall Check
Has the EGR cooler recall been completed? (1.6 million vehicles affected)
4. DPF Status
Check for DPF warning lights; short journeys accelerate clogging
5. Smoke Check
White smoke could indicate EGR cooler coolant leak; black smoke could indicate DPF or injector issues
6. Turbo Check
Test acceleration; any whistling, lag, or power loss?
7. Engine Warning Light
Have codes been read? Any unresolved issues?
8. MOT History
Check for emissions-related failures

Why this matters

A 10-minute check now can save you thousands later. The right 4 Series 418d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 4 Series 418d (or before you commit to an engine replacement), check these:

1
Cold Start
Listen for rattling on startup (N47 timing chain warning)
2
Service History
Including which engine era (N47/B47) and confirmed oil-interval discipline
3
Recall Check
Has the EGR cooler recall been completed? (1.6 million vehicles affected)
4
DPF Status
Check for DPF warning lights; short journeys accelerate clogging
5
Smoke Check
White smoke could indicate EGR cooler coolant leak; black smoke could indicate DPF or injector issues
6
Turbo Check
Test acceleration; any whistling, lag, or power loss?
7
Engine Warning Light
Have codes been read? Any unresolved issues?
8
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 4 Series 418d pitfalls.

Engine Codes

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

N47D20U1

Years: 2013–2015
Power: 143 bhp (105 kW)
2025 Enquiries: —(within N47 figures)
Avg. Recon Cost: £2,200–£4,500[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
N47D20U1	2013–2015	143 bhp (105 kW)	—(within N47 figures)	£2,200–£4,500[PLACEHOLDER]
B47D20A	2015–2020	136–150 bhp (100–110 kW)	—(pattern data)	£2,800–£6,500[PLACEHOLDER]

Technical SpecsN47D20U1 — early generation

Displacement: 1,995 cc
Cylinders: 4-cylinder inline
Compression Ratio: 16.5:1
Fuel System: Common-rail direct injection
Turbocharger: Single turbocharger
Displacement: 1,995 cc
Cylinders: 4-cylinder inline
Compression Ratio: 16.5:1
Fuel System: Common-rail direct injection
Turbocharger: Single turbocharger

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Market Intelligence

Real data from thousands of 4 Series 418d enquiries in 2025.

Most Common FailureN47 timing chain

The N47's "major weak point" with failures reported from 62,000 miles

Average Enquiry Mileage

75,000

miles

[PATTERN DATA]

Average Replacement Cost

£3,500

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B47D20A (post-2015 cars dominate the used market)

[PATTERN DATA]

Peak Enquiry Season

Winter

Cold starts expose timing chain and DPF issues

[PATTERN DATA]

Regional Demand

South East: 20%
London: 18%
North West: 14%
Other Regions: 48%

[PATTERN DATA]

Regional Demand Breakdown

18%London20%South East14%North West48%Other Regions

Frequently Asked Questions

A reconditioned 418d engine typically costs £2,200–£6,500 supply only depending on generation. N47-era engines sit at the lower end (£2,200–£4,500), while B47 units run £2,800–£6,500. Fitting adds £650–£1,300. Rebuilt N47D20C units for F32/F33 chassis are available with 12-month warranty options, saving up to 60% vs dealership. Use our calculator for a figure specific to your car.

It depends on which of the two engine generations your 418d has. The N47 (2013–2015) has a well-documented timing chain weakness — the chain is mounted at the rear of the engine, making replacement an engine-out job. The B47 (2015+) is a significant improvement, but EGR cooler failure (subject to a major BMW recall) and DPF clogging remain common issues. Check the Era Map above for your specific car.

Timing chain failure on the N47 (pre-2015), EGR cooler failure on both N47 and B47 (subject to a 1.6 million vehicle recall), and DPF clogging (particularly with urban driving). The N47 timing chain is the most critical — it can snap without warning, causing catastrophic engine damage.

Depends on vehicle value and generation. Against a well-kept £7,000 418d, a £4,000 recon is 57% of the car's value — borderline. Against a tired £4,000 example, the same recon exceeds our 70% BMW threshold — get a scrap valuation first. For B47-engined cars (post-2015), higher vehicle values make replacement more viable.

Listed on the VIN plate and vehicle documentation. As a rule of thumb: 2013–2015 is N47D20U1 (143 bhp), 2015–2020 is B47D20A (136–150 bhp). The 418d was fitted to F32 (Coupe), F33 (Convertible), and F36 (Gran Coupe) chassis. Tell us your registration date and we'll confirm it for free.

Yes — if caught early. A preventative chain replacement (£1,200–£3,000) is far cheaper than a catastrophic chain snap requiring a full engine replacement. It is recommended to replace the timing chain after 100,000 km, but symptoms may appear sooner. At the first sign of cold-start rattle, book an inspection immediately. Note that the N47's rear-mounted chain makes this an engine-out job.

Disclaimer: 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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see prices, warranty terms and supply & fit options side-by-side before you commit, all from specialists experienced with this entry-level 4 Series diesel and its specific maintenance requirements.
UK Engine Replacement Services for 418d
supply-only or full supply & fit available nationwide, covering everything from timing chain replacement to EGR cooler repair to full engine swaps on your F32, F33 or F36 4 Series.

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BMW 4 Series 418d Engine Replacement —Compare Prices &Get Quotes

The 418d Through Time — Era Map

BMW 4 Series 418d Engine Replacement Costs

Common Problems With BMW 4 Series 418d Engines

1. N47 Timing Chain Failure(Early 418d, 2013–2015)

2. EGR Cooler Failure(N47 and B47)

3. DPF Clogging(N47 and B47)

1. N47 Timing Chain Failure(Early 418d, 2013–2015)

2. EGR Cooler Failure(N47 and B47)

3. DPF Clogging(N47 and B47)

Weighing Your Options?

4 Series 418d — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This 418d? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 4 Series 418d Owners Trust BMWEngines.uk

Trusted 4 Series 418d Engine Suppliers

Compare 4 Series 418d Engine Replacement Companies

UK Engine Replacement Services for 418d

BMW 4 Series 418d Engine Replacement —Compare Prices &
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