BMW 6 Series 620d2018–20232.0L Twin‑Turbo Diesel (B47D20B)

BMW 6 Series 620d Engine Replacement —Compare Prices &
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Name: BMW 6 Series 620d UK Engine Enquiry Data 2025
Creator: BMWEngines.uk

Get quotes today from trusted UK BMW specialists. Compare reconditioned, rebuilt and used B47D20B 2.0‑litre twin‑turbo diesel engines for the 6 Series 620d — the efficient, refined entry point to the Gran Turismo diesel range. Supply & fit available nationwide.

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BMW 6 Series 620d Engines — from £1,200 to £3,500Engine code: B47D20B (B47D20O1)

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Rebuilt
Used
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BMW 6 Series 620d — Which Engine Does Your Car Actually Have?

One generation. One era. One guide to reliability, costs and what really matters.

Era Note

190 PS, 400 Nm — B47 twin‑turbo, timing chain reliability significantly improved over N47

Generation	Years	Engine Code	Reliability	Recon Cost (Guide)	Era Note
G32 (Gran Turismo)	2018–2023	B47D20B(2.0L Twin‑Turbo Diesel I4)		£1,800–£3,200[PLACEHOLDER]	190 PS, 400 Nm — B47 twin‑turbo, timing chain reliability significantly improved over N47

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 6 Series 620d Engine Replacement Costs

Supply Only£1,800 – £3,000
Fitted (Indie)£2,800 – £4,200
Warranty12–24 months
Best ForMost owners — best cost/warranty balance

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

Figures above reflect the G32 620d generation. The B47D20B shares its core with the 520d and 320d, so parts and reconditioned units are relatively available.

Labour estimate: Fitting a 620d engine typically takes 8‑12 hours at £75‑£110/hr (independent BMW specialist).

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Common Problems With BMW 6 Series 620d Engines

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

Symptoms: Rattling noise during cold starts, metallic ticking from the engine, engine warning light — left unaddressed, this can escalate into catastrophic chain failure.
Typical Mileage: 60,000–120,000 miles.
Repair Cost: £800–£2,000 [PLACEHOLDER] (timing chain tensioner and guide replacement).
Replacement Cost: £1,800–£3,500 [PLACEHOLDER] (if chain snaps and damages the engine).
Urgency: 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.

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

Symptoms: Rattling noise during cold starts, metallic ticking from the engine, engine warning light — left unaddressed, this can escalate into catastrophic chain failure.
Typical Mileage: 60,000–120,000 miles.
Repair Cost: £800–£2,000 [PLACEHOLDER] (timing chain tensioner and guide replacement).
Replacement Cost: £1,800–£3,500 [PLACEHOLDER] (if chain snaps and damages the engine).
Urgency: Immediate — if you hear cold‑start rattle, book an inspection immediately.

Our recommendation:

2. EGR Valve / Cooler Failure(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).
Urgency: Check — book inspection urgently if engine warning light appears.

Our recommendation:

EGR system failure is a common issue on 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.

3. 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).
Urgency: Monitor — book inspection soon if DPF warning appears.

Our recommendation:

The 620d's twin‑turbo diesel 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.

4. Oil Leaks — Valve Cover & Oil Filter Housing(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).
Urgency: Check — book inspection urgently if oil leak is detected.

Our recommendation:

The B47 is 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 620d or a burning oil smell, investigate immediately.

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6 Series 620d — 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
B47 timing chain tensioner wear	Yes (if caught early)	£800 – £2,000[PLACEHOLDER]	Catch it early — cheaper than engine replacement
B47 timing chain snapped	Usually No	£1,800 – £3,500+	Full engine replacement — valve damage is almost certain
EGR valve / cooler failure	Yes	£400 – £1,000[PLACEHOLDER]	Worth fixing — common and well‑understood repair
DPF blockage	Yes	£400 – £1,200[PLACEHOLDER]	Routine maintenance — always worth doing
Oil leaks (valve cover / OFHG)	Yes	£300 – £800[PLACEHOLDER]	Essential maintenance — always worth doing
Major internal failure (crank, bearings)	Usually No	£1,800 – £3,500+	Full engine replacement often more cost‑effective

ProblemRepairable? · Typical Cost

B47 timing chain tensioner wear

Yes (if caught early)£800 – £2,000[PLACEHOLDER]

Catch it early — cheaper than engine replacement

B47 timing chain snapped

Usually No£1,800 – £3,500+

Full engine replacement — valve damage is almost certain

EGR valve / cooler failure

Yes£400 – £1,000[PLACEHOLDER]

Worth fixing — common and well‑understood repair

DPF blockage

Yes£400 – £1,200[PLACEHOLDER]

Routine maintenance — always worth doing

Oil leaks (valve cover / OFHG)

Yes£300 – £800[PLACEHOLDER]

Essential maintenance — always worth doing

Major internal failure (crank, bearings)

Usually No£1,800 – £3,500+

Full engine replacement often more cost‑effective

Buying This BMW 6 Series 620d? Check These First

Buy if:

Full BMW service history with documented oil changes (every 8,000–10,000 miles)
B47: Timing chain tensioner checked, especially on pre‑2018 units
Evidence of regular motorway driving (DPF‑friendly usage)
A well‑maintained example with lower mileage

Avoid if:

Any sign of cold‑start rattle — timing chain tensioner warning
No evidence of regular oil changes — the B47 is intolerant of neglect
DPF warnings on the dashboard — indicates urban‑only driving
Poor service history — these engines demand strict maintenance

Closing verdict

The BMW 620d offers efficient, refined twin‑turbo diesel performance in the spacious Gran Turismo body. The B47D20B is a significantly improved engine over the N47 — timing chain issues are less prevalent, but 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.

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Buying Checklist

Before you buy a used BMW 6 Series 620d (or before you commit to an engine replacement), check these:

1. Cold Start
Any rattle? (B47 timing chain tensioner warning — stop immediately)
2. Service History
Regular oil changes (8,000–10,000 miles) — this is non‑negotiable
3. Timing Chain History
B47: Has the chain tensioner been inspected?
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

Why this matters

A 10-minute check now can save you thousands later. The right 6 Series 620d is a superb long-term car — the wrong one can be expensive fast.

Buying Checklist

Before you buy a used BMW 6 Series 620d (or before you commit to an engine replacement), check these:

1
Cold Start
Any rattle? (B47 timing chain tensioner warning — stop immediately)
2
Service History
Regular oil changes (8,000–10,000 miles) — this is non‑negotiable
3
Timing Chain History
B47: Has the chain tensioner been inspected?
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 6 Series 620d pitfalls.

Engine Codes

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

B47D20B (B47D20O1, 2.0L Twin‑Turbo Diesel I4)

Years: 2018–2023
Power: 190 PS (140 kW) / 400 Nm
2025 Enquiries: —(pattern data)
Avg. Recon Cost: £1,800–£3,000[PLACEHOLDER]

Engine Code	Years	Power	2025 Enquiries	Avg. Recon Cost
B47D20B (B47D20O1, 2.0L Twin‑Turbo Diesel I4)	2018–2023	190 PS (140 kW) / 400 Nm	—(pattern data)	£1,800–£3,000[PLACEHOLDER]

Technical SpecsB47D20B — 2.0L Twin‑Turbo Diesel

Displacement: 1,995 cc
Cylinders: 4‑cylinder inline
Compression Ratio: 16.5:1
Fuel System: Common‑rail direct injection
Aspiration: Twin‑turbocharged (sequential)
Valvetrain: DOHC, 16 valves

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Market Intelligence

Real data from thousands of 6 Series 620d enquiries in 2025.

Most Common Failure

B47 timing chain tensioner wear (pre‑2018 units) / EGR valve failure

Average Enquiry Mileage

40,000–70,000

miles

[PATTERN DATA]

Average Replacement Cost

£2,400

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

B47D20B

Sole 620d engine

[PATTERN DATA]

Peak Enquiry Season

Autumn/Winter

Cold starts expose timing chain wear

[PATTERN DATA]

Regional Demand

South East: 22%
London: 16%
Other Regions: 62%

[PATTERN DATA]

Regional Demand Breakdown

16%London22%South East62%Other Regions

Frequently Asked Questions

A reconditioned 620d engine (B47D20B) typically costs £1,800–£3,000 supply only. Fitting adds £1,000–£1,400. Use our calculator for a figure specific to your vehicle.

The B47D20B is a significantly improved engine over the N47 — timing chain issues are less prevalent, but pre‑2018 units remain susceptible to tensioner wear. With regular oil changes (8,000–10,000 miles) and proper maintenance, the B47 can exceed 120,000 miles without major issues.

The most common issues are B47 timing chain tensioner wear (pre‑2018 units), EGR valve/cooler failure, DPF blockage from urban driving, and oil leaks (valve cover gasket, oil filter housing gasket).

Depends on vehicle value and condition. Against a tidy £10,000–£25,000 6 Series, a £1,800–£3,500 recon is 7–35% of the car's value — often worth it on well‑maintained examples. If the timing chain has snapped, a full engine replacement may be necessary. Get a full diagnostic assessment before committing.

The 620d uses the B47D20B (also B47D20O1) 2.0‑litre twin‑turbo diesel. The engine code is stamped on the engine block and listed on your V5C. The 620d badge itself confirms the engine — it's the 190 PS diesel offered in the G32 6 Series Gran Turismo.

Most issues — timing chain tensioner wear (if caught early), EGR valve failure, DPF blockage, oil leaks — are repairable. However, if the timing chain has snapped, 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.

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.

Why UK BMW 6 Series 620d Owners Trust BMWEngines.uk

Trusted 620d Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 6 Series owners, as part of the Engine Finders network, covering the B47D20B twin‑turbo diesel with specialist knowledge of BMW's B‑family diesel technology.
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see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who understand the B47's timing chain tensioner requirements, EGR system, and the importance of regular oil changes and DPF maintenance.
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supply‑only or full supply & fit available nationwide, covering the G32 620d from 2018 to 2023, with specialist knowledge of BMW's entry‑level diesel GT engine.

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BMW 6 Series 620d Engine Replacement —Compare Prices &Get Quotes

BMW 6 Series 620d — Which Engine Does Your Car Actually Have?

BMW 6 Series 620d Engine Replacement Costs

Common Problems With BMW 6 Series 620d Engines

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

2. EGR Valve / Cooler Failure(B47)

3. DPF Blockage(Urban Driving)

4. Oil Leaks — Valve Cover & Oil Filter Housing(B47)

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

2. EGR Valve / Cooler Failure(B47)

3. DPF Blockage(Urban Driving)

4. Oil Leaks — Valve Cover & Oil Filter Housing(B47)

Weighing Your Options?

6 Series 620d — Repair, Buy, or Replace?

Can It Be Repaired?

Buying This BMW 6 Series 620d? Check These First

Buying Checklist

Buying Checklist

Engine Codes

Market Intelligence

Regional Demand Breakdown

Frequently Asked Questions

Why UK BMW 6 Series 620d Owners Trust BMWEngines.uk

Trusted 620d Engine Suppliers

Compare 620d Engine Replacement Companies

UK Engine Replacement Services for the 6 Series Gran Turismo

BMW 6 Series 620d Engine Replacement —Compare Prices &
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