Most Replaced Engines UK · 2026 · Document ID: EM-MR-2026-01

Most Replaced Engines UK 2026
Top 15 Ranking

#1 BMW N47D20C: 1,450 requests · #2 Mercedes OM651: 1,250 requests
#3 Land Rover 204DTD: 1,150 requests
Based on 24,650 real UK engine replacement quote requests. Replacement costs, failure modes, and vehicle value analysis.

#1 Most Replaced
BMW N47D20C
1,450 requests · Timing chain failure
#2 Most Replaced
Mercedes OM651
1,250 requests · Timing chain tensioner
#3 Most Replaced
Land Rover 204DTD
1,150 requests · Timing chain tensioner
24,650 quote requests analysed
Top 15 ranking
Jan-Dec 2025 data
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Index Overview · Document ID: EM-MR-2026-01

About the Most Replaced Engines UK 2026

This document presents the definitive ranking of which engines actually get replaced in the UK - based on 24,650 real engine replacement quote requests processed through EnginesMarket.co.uk between January and December 2025 [EM-VERIFIED].

This is not a reliability ranking. High replacement frequency may reflect large vehicle parc, age profile, or audience bias - not engineering quality. However, for used car buyers, this data shows exactly which engines are most frequently requiring replacement and what to budget for.

This is an index, not a quote tool. For personalised pricing, use the Engines Market comparison service.

[EM-VERIFIED]Exact count or percentage from our CRM
[EM-QUOTE]Derived from supplier quotes & interviews
[THIRD-PARTY]External data from named industry sources
[SCTD]Supplier Confirmed Transaction Data

Review cycle: annually · next full review: January 2027.

Dataset Methodology

How the data was collected and analysed

This ranking is based on quote request volume, not failure rate. High volume may reflect large vehicle parc size, specific age profile, or audience bias.

Parameter Specification
Total quote requests24,650 [EM-VERIFIED]
Time period1 Jan 2025 - 31 Dec 2025
Data sourcesCustomer enquiries, supplier notes, post-sale surveys, TSBs, forums
Data classificationDQD (Direct Quote Dataset), SCTD (Supplier Confirmed Transaction Data)
Ranking basisTotal unique quote requests per engine code

Methodology note: This ranking is based on quote request volume, not failure rate. High volume may reflect: large vehicle parc size, specific age profile (vehicles entering high-risk mileage bands), or audience bias (platform user demographics).

Top 15 Ranking

Most Replaced Engines UK - Top 15

Ranking based on 24,650 real quote requests. [EM-VERIFIED]

Rank Engine Code Requests Primary Models Primary Failure
1 BMW N47D20C 1,450 3 Series, 1 Series, 5 Series, X1, X3 Timing chain stretch
2 Mercedes OM651 1,250 C-Class, E-Class, GLA, Sprinter Timing chain tensioner, injector seals
3 Land Rover 204DTD 1,150 Discovery Sport, Evoque, Freelander 2 Timing chain tensioner (pre-2019)
4 VW/Audi EA189 2.0 TDI 1,050 A4, A3, Q3, Golf, Passat DPF/EGR, injector coking
5 Land Rover 306DT TDV6/SDV6 980 Range Rover Sport, Discovery 5, L405 Crankshaft bearing failure
6 BMW B47D20A 930 3 Series, 5 Series, X models EGR cooler failure
7 Mercedes OM642 880 E-Class, ML/GLE, GL/GLS Oil cooler seal leak
8 BMW N57D30 830 330d/335d, 530d, X3, X5 Timing chain stretch, turbo wear
9 Ford DV6 1.6 TDCi 780 Focus, Fiesta, Transit Connect Injector failure, DPF clogging
10 Renault K9K 1.5 dCi 730 Clio, Megane, Scenic, Kadjar Injector failure, turbo failure
11 Land Rover/Jaguar 276DT TDV6 700 Discovery 3, RR Sport, XF, XJ Oil pump housing failure
12 Land Rover 368DT TDV8 650 Range Rover, RR Sport Timing chain tensioner
13 Land Rover 508PS SDV8 620 L405, L494 Oil dilution (DPF regen)
14 Jaguar AJ200D / 204DTD 590 XE, XF, F-Pace, E-Pace Same as LR 204DTD
15 Jaguar AJ126 3.0 V6 SC 560 XF, XJ, F-Type, F-Pace Water pump, coolant leaks

[EM-VERIFIED] based on 24,650 unique quote requests in 2025. This is a ranking of replacement frequency, not reliability.

Replacement Cost by Engine

What it costs to replace each engine

Reconditioned supply and fitted costs for each of the top 15 most replaced engines. [EM-QUOTE]

Rank Engine Code Recon Supply Cost Recon Fitted Cost Used Supply Cost
1BMW N47D20C£3,200 - £5,500£3,850 - £6,410£1,800 - £3,200
2Mercedes OM651£2,800 - £4,800£3,320 - £5,580£1,500 - £2,800
3Land Rover 204DTD£3,500 - £5,800£4,150 - £6,710£2,000 - £3,500
4VW/Audi EA189 2.0 TDI£2,200 - £3,800£2,720 - £4,515£900 - £2,000
5Land Rover 306DT SDV6£6,500 - £9,500£7,475 - £10,800£3,500 - £5,500
6BMW B47D20A£2,800 - £4,500£3,320 - £5,280£1,500 - £2,800
7Mercedes OM642£3,200 - £5,500£3,850 - £6,410£1,800 - £3,200
8BMW N57D30£4,500 - £7,000£5,280 - £8,040£2,500 - £4,500
9Ford DV6 1.6 TDCi£1,200 - £2,200£1,590 - £2,720£400 - £900
10Renault K9K 1.5 dCi£1,500 - £2,800£1,890 - £3,385£500 - £1,200
11Land Rover/Jaguar 276DT£5,000 - £7,500£5,910 - £8,670£2,800 - £4,500
12Land Rover 368DT TDV8£5,500 - £8,000£6,410 - £9,170£3,000 - £5,000
13Land Rover 508PS SDV8£8,000 - £12,000£9,040 - £13,300£4,500 - £7,000
14Jaguar AJ200D / 204DTD£3,500 - £5,800£4,150 - £6,710£2,000 - £3,500
15Jaguar AJ126 3.0 V6 SC£4,500 - £7,500£5,280 - £8,540£2,500 - £4,500

[EM-QUOTE] derived from supplier quote data. Fitted costs assume indie labour at regional average.

Failure Mode Summary

Why each engine is replaced

Primary and secondary failure modes with typical mileage at replacement. [SCTD]

Engine Primary Failure Mode Secondary Failure Typical Mileage
BMW N47D20CTiming chain stretch (rear-mounted)Turbocharger wear60k-120k
Mercedes OM651Timing chain tensioner, injector seal (Black Death)DPF/EGR clogging80k-150k
Land Rover 204DTDTiming chain tensioner (pre-2019)Oil dilution, EGR cooler60k-120k
VW/Audi EA189 2.0 TDIDPF blockage, EGR valveInjector coking80k-150k
Land Rover 306DT SDV6Crankshaft bearing failure (catastrophic)Oil pump issues80k-140k
BMW B47D20AEGR cooler failure (recall)Timing chain (less frequent)60k-120k
Mercedes OM642Oil cooler seal leakSwirl flap motor70k-150k
BMW N57D30Timing chain stretchTurbocharger wear80k-150k
Ford DV6 1.6 TDCiInjector failureDPF clogging80k-150k
Renault K9K 1.5 dCiInjector failure (swarf)Turbocharger failure80k-150k
Land Rover/Jaguar 276DTOil pump housing failureCrankshaft failure80k-140k
Land Rover 368DT TDV8Timing chain tensionerCrankshaft fracture70k-130k
Land Rover 508PS SDV8Oil dilution (DPF regen)Oil cooler100k-180k
Jaguar AJ200D / 204DTDSame as LR 204DTD-60k-120k
Jaguar AJ126 3.0 V6 SCWater pump failureCoolant crossover pipes60k-120k

[SCTD] Supplier Confirmed Transaction Data. Failure modes triangulated with TSBs and public forums.

Replacement Age & Mileage

When engines typically fail

Average mileage and vehicle age at replacement, with typical vehicle values. [EM-QUOTE]

Engine Average Mileage at Replacement Average Vehicle Age at Replacement Typical Vehicle Value
BMW N47D20C85k-100k10-12 years£3,000-£9,000
Mercedes OM65190k-110k9-11 years£5,000-£18,000
Land Rover 204DTD70k-90k6-8 years£12,000-£30,000
VW/Audi EA189 2.0 TDI95k-120k10-14 years£2,000-£8,000
Land Rover 306DT SDV680k-100k8-12 years£10,000-£40,000
BMW B47D20A75k-95k6-8 years£7,000-£20,000
Mercedes OM64285k-105k10-12 years£5,000-£22,000
BMW N57D3090k-110k10-12 years£8,000-£25,000
Ford DV6 1.6 TDCi95k-115k12-15 years£1,200-£5,000
Renault K9K 1.5 dCi90k-110k11-14 years£1,500-£6,000

Key observation: Premium brand engines (BMW, Land Rover, Mercedes) are typically replaced at 6-12 years old and 70k-110k miles. Volume brand engines (Ford, Renault) are replaced at 10-15 years old and 90k-115k miles.

Trend Analysis

Rising & Falling Replacement Frequency

Year-over-year changes in replacement frequency. [EM-VERIFIED]

📈 Rising Replacement Frequency

Engine 2024 Rank 2025 Rank Change Driver
Land Rover 204DTD (Ingenium D) #6 #3 ↑3 Pre-2019 timing chain failures reaching critical mass
BMW B47D20A #8 #6 ↑2 EGR cooler recall volume increasing
Land Rover 306DT SDV6 #7 #5 ↑2 Crankshaft failures on 80k+ mile examples accelerating

📉 Falling Replacement Frequency

Engine 2024 Rank 2025 Rank Change Driver
Ford DV6 1.6 TDCi #7 #9 ↓2 Older vehicles scrapped rather than replaced
Renault K9K 1.5 dCi #9 #10 ↓1 Lower-value hosts scrapped; owners moving to newer cars
Industry Context

Largest Warranty Claims

Real-world examples of high-value engine replacement claims. [THIRD-PARTY]

Claim Amount Vehicle Year Source
2025 top claim £22,954 2020 Audi 2025 [THIRD-PARTY: RAC Warranty Claims Data, 2025]
2024 top claim £26,233 2016 BMW 2024 [THIRD-PARTY: RAC Warranty Claims Data, 2024]

Context: All top 5 warranty claims in 2024 exceeded £19,000. This reinforces the financial impact of major engine failures, particularly on premium and high-performance vehicles. The Audi claim (£22,954) and BMW claim (£26,233) demonstrate that replacement costs for modern vehicles can exceed £20,000 - well above the average reconditioned engine cost of £2,100-£3,500. [THIRD-PARTY]

Vehicle Value Threshold

Replacement Viability

Is it worth replacing your engine, or should you scrap the car- [EM-QUOTE]

Engine Recon Fitted Cost Typical Vehicle Value Replacement-to-Value Flag
BMW N47D20C£3,850 - £6,410£3,000-£9,000⚠️ Watch
Mercedes OM651£3,320 - £5,580£5,000-£18,000✅ Safe
Land Rover 204DTD£4,150 - £6,710£12,000-£30,000✅ Safe
VW/Audi EA189 2.0 TDI£2,720 - £4,515£2,000-£8,000⚠️ Watch
Land Rover 306DT SDV6£7,475 - £10,800£10,000-£40,000✅ Safe
Ford DV6 1.6 TDCi£1,590 - £2,720£1,200-£5,000🔴 Scrap Threshold
Renault K9K 1.5 dCi£1,890 - £3,385£1,500-£6,000🔴 Scrap Threshold
✅ Safe
Replacement cost well within vehicle value
⚠️ Watch
Replacement cost may approach 50-80% of vehicle value
🔴 Scrap Threshold
Replacement cost risks exceeding vehicle value
Key Takeaways

What this data tells you

BMW N47D20C is the most replaced UK engine (1,450 requests)
Timing chain failure affects BMW 4-cylinder diesels across multiple models.
Land Rover engines occupy 4 of top 10 spots
204DTD, SDV6, 276DT, and 368DT - premium SUV owners face significant replacement risk.
VW EA189 is #4 (1,050 requests)
Despite Dieselgate, these engines are still failing; the used market is keeping them going.
Recon fitted costs range from £1,590 to £13,300
Replacement cost varies by nearly 10x across the top 15 engines.
Ford DV6 and Renault K9K are 🔴 Scrap Threshold engines
Replacement often exceeds vehicle value for these models.
70.45% of requests are for reconditioned engines
Warranty and documented quality are valued over upfront savings.
Dataset Limitations

Understanding the data

  • Replacement frequency ≠ unreliability: High volume may reflect large vehicle parc, not engineering quality.
  • Self-reporting bias: Requests come from platform users, not a random sample.
  • Age skew: Older vehicles (8+ years) are overrepresented.
  • Commercial vehicles: Light commercial vehicles have different failure patterns and are not fully captured.
Frequently Asked Questions

Common questions about the most replaced engines

What is the most replaced engine in the UK- +
The BMW N47D20C is the most replaced engine in the UK, with 1,450 quote requests in 2025 [EM-VERIFIED]. This 2.0-litre diesel engine is found in BMW 3 Series, 1 Series, 5 Series, X1, and X3 models. The primary failure is timing chain stretch, particularly on the rear-mounted chain.
Is the most replaced engine the most unreliable- +
No. High replacement frequency may reflect large vehicle parc (many on the road), age profile, or audience bias - not engineering quality. For example, the VW EA189 2.0 TDI is #4 with 1,050 requests, partly because millions were sold in the UK.
How much does it cost to replace a BMW N47 engine- +
A reconditioned BMW N47D20C costs £3,200-£5,500 supply-only, or £3,850-£6,410 fitted [EM-QUOTE]. Used options start from £1,800-£3,200 supply-only. Fitting costs depend on your region and garage.
Why are Land Rover engines so prominent in the top 15- +
Land Rover engines occupy 4 of the top 10 spots (204DTD, 306DT SDV6, 276DT, 368DT). This is due to a combination of known engineering issues (timing chain tensioners, crankshaft bearings, oil pump housings), high vehicle values that justify replacement, and a large premium SUV parc in the UK.
Is it worth replacing a Ford DV6 1.6 TDCi engine- +
The Ford DV6 1.6 TDCi is flagged as a 🔴 Scrap Threshold engine. With fitted costs of £1,590-£2,720 and typical vehicle values of £1,200-£5,000, replacement often exceeds the car's value. Consider scrapping unless the car is in excellent condition.
Why does reconditioned cost more than used- +
Reconditioned engines are disassembled, cleaned, and have worn parts replaced (pistons, rings, bearings, seals). They are tested to standard and come with a 6-12 month warranty. Used engines are direct from donor vehicles with unknown history.
What should I consider when deciding repair vs. scrap- +
If the fitted replacement cost exceeds approximately 60% of the vehicle's current market value, consider scrapping. However, rare, collectable, or sentimental vehicles may justify spending above this threshold. Check our engine replacement cost guide for more guidance.
How can I get a personalised replacement quote- +
Use the Get Your Personalised Price form at the top and bottom of this page. Enter your vehicle registration, and we'll connect you with 100+ UK specialist suppliers for real, no-obligation quotes.
Further Reading

Explore more insights and guides

↗UK Engine Price Index 2026 ↗UK Engine Replacement Statistics 2026 ↗Most Common Engine Failures UK ↗Most Reliable Diesel Engines ↗Most Reliable Petrol Engines ↗Engine Replacement Cost Guide ↗Full Methodology ↗All Insights & Research →Get Your Personalised Price