How much does a BMW 6 Series 620d engine replacement cost in the UK?

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.

Is the BMW 6 Series 620d engine reliable?

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.

What are the common problems with the BMW 6 Series 620d?

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).

Is it worth replacing a 620d engine, or should I scrap the car?

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.

How do I find my 6 Series's engine code?

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.

Can I repair a 620d engine issue, or does it need replacement?

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.

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

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

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.

Supply & Fit Available

12‑Month Warranty

Nationwide Delivery

20+ Specialists

Supply & Fit Available

12‑Month Warranty

Nationwide Delivery

20+ Specialists

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

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

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK‑Wide Network

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

Four generations. Four eras. 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

GenerationYearsEngine CodeReliabilityRecon CostEra Note

G32 (Gran Turismo) BMW 320d G32 (Gran Turismo)

2018–2023B47D20B (2.0L Twin‑Turbo Diesel I4)★★★★☆ [NEWLY ASSIGNED - see Data Note]£1,800–£3,200 [PLACEHOLDER - confirm vs cost sheet]190 PS, 400 Nm - B47 twin‑turbo, timing chain reliability significantly improved over N47

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 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 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–£3,000£2,800–£4,20012–24 monthsMost owners - best cost/warranty balance

Rebuilt Engine£2,500–£3,500£3,500–£4,80012–24 monthsLong‑term ownership; maximum reliability

Main Dealer New£4,500–£6,000£6,000–£7,50024–36 monthsInsurance 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).

→ Compare 6 Series 620d engine prices from UK specialists

Common Problems With BMW 320d 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).

🔴 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).

🔴 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).

🟠 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).

🟡 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).

🟠 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.

Weighing Your Options?

Compare Specialist Quotes When You're Ready

20+ vetted BMW specialists, covering the B47D20B 620d engine, with a 12‑month warranty as standard.

See 6 Series 620d Engine Options

BMW 6 Series 620d - 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 6 Series 620d - 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 SenseB47 timing chain tensioner wear✅ Yes (if caught early)£800–£2,000 [PLACEHOLDER]Catch it early - cheaper than engine replacementB47 timing chain snapped❌ Usually No£1,800–£3,500+Full engine replacement - valve damage is almost certainEGR 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–£3,500+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.

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

→ Compare 6 Series 620d 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 6 Series 620d engine prices before you buy

20+ Vetted Specialists UK Network

12-Month Warranty as Standard

Nationwide Delivery & Collection

Transparent Pricing, No Hidden Fees

Thousands of 320d Owners Helped

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 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.

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

Years2018–2023

Power190 PS (140 kW) / 400 Nm

2025 Enquiries- (pattern data)

Avg. Recon Cost£1,800–£3,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

B47D20B (B47D20O1, 2.0L Twin‑Turbo Diesel I4)2018–2023190 PS (140 kW) / 400 Nm- (pattern data)£1,800–£3,000 [PLACEHOLDER]

Technical Specs

B47D20B - 2.0L Twin‑Turbo Diesel

Displacement1,995 cc

Cylinders4‑cylinder inline

Compression Ratio16.5:1

Fuel SystemCommon‑rail direct injection

AspirationTwin‑turbocharged (sequential)

ValvetrainDOHC, 16 valves

→ Compare 6 Series 620d engine prices for your BMW

Get quotes from trusted UK specialists in minutes.

Market Intelligence

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 East22%

London16%

North West (12%) - premium GT 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.

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.
Compare 620d Engine Replacement Companies
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.
UK Engine Replacement Services for the 6 Series Gran Turismo
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.

Find the best BMW 6 Series 620d engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.

Explore BMW 6 Series 620d Engine Quotes

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

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