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Vauxhall B20DTH Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The Vauxhall B20DTH is a 2.0-litre turbo diesel, the higher-output BiTurbo variant fitted to Insignia, Astra, and Zafira models from 2015. Reconditioned units from £2,800 with a full 12-month warranty.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£1,500
Reconditioned from
£2,800
Rebuilt from
£4,000
GB
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Quotes only from vetted UK engine specialists.
Key Specs
Vauxhall B20DTH - Specifications at a Glance
Engine Code
B20DTH (also known as LFS)
Fuel
Diesel
Configuration
2.0L inline-4, BiTurbo
Power Output(s)
170 hp (125 kW) @ 3500-4000 rpm; 400 Nm torque @ 1750-2500 rpm
Years Produced
2014-present
UK Models Fitted
5 Vauxhall models - full list in Compatibility below
2025 UK Replacement Requests
[Data pending - please supply]
Replaced
A20DTH (2.0 CDTi predecessor)
Replaced By
D20DTH (later Euro 6d variant)
Most Common Failure
Timing belt / cam belt failure, cooling system cracks
Reconditioned Price Range
£2,800-£4,000 supply-only
Vetted UK specialists for B20DTH replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Vauxhall Models Use the B20DTH-
**TAG:** Fitted To
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Vauxhall Insignia A | Insignia A (2014-2017) | 2.0 CDTi 170hp | 2015-2017 | |
| Vauxhall Insignia B Grand Sport | Insignia B | 2.0 CDTi 170hp | 2017-onwards | |
| Vauxhall Insignia B Sports Tourer | Insignia B estate | 2.0 CDTi 170hp | 2017-onwards | |
| Vauxhall Zafira C | Zafira C Tourer | 2.0 CDTi 170hp | 2014-2017 | |
| Vauxhall Cascada | Cascada | 2.0 CDTi 170hp | 2015-2019 | |
| Vauxhall Astra K | Astra K | 2.0 CDTi 170hp | 2015-onwards | |
| Vauxhall Opel Antara | Antara | 2.0 CDTi 170hp | 2016-2017 |
02
Vauxhall Insignia B Grand Sport
03
Vauxhall Insignia B Sports Tourer
Generation/Chassis
Insignia B estate
Badge(s)
2.0 CDTi 170hp
Years
2017-onwards
04
Vauxhall Zafira C
05
Vauxhall Cascada
06
Vauxhall Astra K
07
Vauxhall Opel Antara
CROSS-BRAND
B20DTH is documented across 7 BMW applications spanning Vauxhall Insignia A, Vauxhall Insignia B Grand Sport, Vauxhall Insignia B Sports Tourer, Vauxhall Zafira C, Vauxhall Cascada, Vauxhall Astra K, Opel Antara. Registration lookup confirms the exact suffix before quotes are sent.
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Not sure which engine your car has- Enter your registration above - we'll confirm your exact B20DTH fitment before any quotes are sent.
Prices
Vauxhall B20DTH Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £1,500-£2,500 | £2,100-£3,200 | 3-6 months |
Reconditioned | £2,800-£4,000 | £3,400-£4,800 | 12-24 months |
Rebuilt | £4,000-£5,500 | £4,600-£6,300 | 12-24 months |
What genuinely moves the price for this engine is whether the timing belt has been changed, the condition of the fuel pump, and if the cooling system is intact. Cam belt failure often writes off the engine - a replacement with a full history and new belt kit can save money in the long run . See our full reconditioned engine cost guide.
Labour Guide
Fitting a B20DTH typically takes 8-12 hours at £65-£90/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Vauxhall B20DTH Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the B20DTH, based on real-world data and verified failure patterns.
Verified issue focus: Timing belt / cam belt failure, cooling system cracks.
1. Timing Belt / Cam Belt Failure - Premature Belt Wear
1. Timing Belt / Cam Belt Failure - Premature Belt Wear
Typical onset:
70,000-85,000 miles
What happens:
The B20DTH uses a timing belt with a recommended replacement interval of 100,000 miles or 6 years. However, owner reports indicate belts can fail or jump teeth earlier, with plastic idler pulleys cracking and reducing tension. This is an interference engine - if the belt fails, valves and pistons can collide .
Repair vs replace:
If caught early (belt slip without full failure), replacement of the belt, tensioners, and broken rockers may be sufficient. Full belt failure typically writes off the engine, requiring a full replacement .
Read more about this issue
2. Cooling System Cracks - Expansion Tank Failure
2. Cooling System Cracks - Expansion Tank Failure
Typical onset:
From 60,000 miles
What happens:
The coolant expansion tank is prone to cracking, causing slow coolant loss that can be difficult to trace. Owners report the tank cracking at the bottom, as well as deteriorating coolant hoses .
Repair vs replace:
Replacement of the expansion tank and affected hoses resolves this. However, ignoring a slow coolant leak can lead to overheating and engine damage.
Read more about this issue
3. Fuel Pump Issues - High-Pressure Diesel Pump Wear
3. Fuel Pump Issues - High-Pressure Diesel Pump Wear
Typical onset:
80,000-100,000 miles
What happens:
The Bosch high-pressure fuel pump (0445010759) can wear over time, particularly if fuel contamination occurs. This is a common failure point across Vauxhall's 2.0 CDTi range .
Repair vs replace:
Replacement of the fuel pump is required. Early diagnosis via fuel pressure testing can prevent injector damage, which would increase repair costs significantly.
Read more about this issue
The B20DTH has been largely superseded by the D20DTH Euro 6d variant. Later production units (post-2018) have seen improved belt materials and cooling system components, reducing early failure rates .
Compare rebuilt B20DTH prices with the failure already addressed
Engine Variants
B20DTH Sub-Codes Explained - Which One Is in Your Car-
The B20DTH is also known by its GM code LFS . It is the BiTurbo 170 hp variant of Vauxhall's 2.0-litre diesel family, sitting above the 165 hp D20DTH and below the 206 hp D20DTR BiTurbo. - Fitted to: Insignia A (2015-2017), Zafira C (2014-2017), Cascada (2015-2017) - Key technical difference: 2.0-litre inline-4, 170 hp (125 kW), 400 Nm torque. Compression ratio 16.5:1 . Uses Bosch EDC17 ECU. - Sub-code-specific failure note: Shares the family failure pattern above - timing belt tensioner and cooling system are the primary documented weaknesses. - Interchange note: Not a straight swap with D20DTR (206 hp) - the engine management, fuel system, and turbocharger vary. - Fitted to: Insignia B Grand Sport, Insignia B Sports Tourer (2017-onwards) - Key technical difference: The non-BiTurbo variant, often fitted alongside B20DTH in the Insignia B range. Lower output but similar architecture. - Sub-code-specific failure note: Shares the family timing belt and cooling system concerns. - Interchange note: A suitable replacement but requires ECU calibration changes to match the vehicle's systems.
The engine code is stamped on the engine block and listed on the vehicle's V5C log book. If you're unsure, enter your registration above and we'll confirm your exact B20DTH fitment.
Easily Confused
D20DTH
The B20DTH is also known by its GM code LFS . It is the BiTurbo 170 hp variant of Vauxhall's 2.0-litre diesel family, sitting above the 165 hp D20DTH and below the 206 hp D20DTR BiTurbo.
Alternative / Next-Gen Code
D20DTR
The B20DTH is also known by its GM code LFS . It is the BiTurbo 170 hp variant of Vauxhall's 2.0-litre diesel family, sitting above the 165 hp D20DTH and below the 206 hp D20DTR BiTurbo.
Related JLR Variants
EDC17
- Key technical difference: 2.0-litre inline-4, 170 hp (125 kW), 400 Nm torque. Compression ratio 16.5:1 . Uses Bosch EDC17 ECU.
Confirm the exact B20DTH fitment
The engine code is stamped on the engine block and listed on the vehicle's V5C log book. If you're unsure, enter your registration above and we'll confirm your exact B20DTH fitment.
Buying Guide
Buying a Replacement B20DTH - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used B20DTH can be a cost-effective option for lower-value Insignia or Astra hosts. However, buyers must verify whether the timing belt has been replaced - a 70,000+ mile unit without belt change carries significant risk. Fuel pump condition is also critical . See our used engine guide.
Reconditioned:
A proper reconditioned B20DTH addresses the two major failure modes - the timing belt and cooling system. It should include a new belt kit, water pump, and a full inspection of the fuel system. This is the right call for most owners: the reliability of a new unit at half the price of a new car. See our reconditioned engine guide.
Rebuilt:
A full rebuild is only justified for B20DTHs in high-value vehicles (low-mileage Insignia Bs, or rare Cascada convertibles). Rebuilds can include upgraded belt components and improved cooling system parts, but the cost often approaches the value of the vehicle . See our rebuilt engine guide.
Supply & Fit Line:
We connect you with vetted specialists who can fit the B20DTH across the UK, offering warranties on both parts and labour. See our supply and fit service.
Vehicle Value Note:
The B20DTH is fitted to vehicles typically valued between £4,000 and £14,000. A reconditioned engine at £2,800-£4,000 represents 20-40% of the vehicle's value, making replacement a financially sound decision on most examples. Lower-value Insignia A examples (£3,000-£5,000) are approaching the scrap threshold .
Compare B20DTH Engine Prices Now
Related Engines
Related Engines
Explore engines that are closely related to the Vauxhall B20DTH, including its predecessor, successor, and key family variants.
Predecessor
A20DTH (2.0 CDTi predecessor)
A20DTH (2.0 CDTi predecessor)
Successor
D20DTH (later Euro 6d variant)
D20DTH (later Euro 6d variant)
Sibling
D20DTH
The B20DTH is also known by its GM code LFS . It is the BiTurbo 170 hp variant of Vauxhall's 2.0-litre diesel family, sitting above the 165 hp D20DTH and below the 206 hp D20DTR BiTurbo.
Sibling
D20DTR
The B20DTH is also known by its GM code LFS . It is the BiTurbo 170 hp variant of Vauxhall's 2.0-litre diesel family, sitting above the 165 hp D20DTH and below the 206 hp D20DTR BiTurbo.
FAQ
B20DTHFrequently Asked Questions
Question 1How much does a reconditioned B20DTH engine cost-
A reconditioned B20DTH engine typically costs £2,800-£4,000 supply-only.
Compare B20DTH quotesQuestion 2How much does a used B20DTH engine cost-
Used B20DTH engines usually start from £1,500-£2,500 depending on mileage and provenance.
Compare B20DTH quotesQuestion 3What should I check before buying a B20DTH replacement-
The B20DTH is fitted to vehicles typically valued between £4,000 and £14,000. A reconditioned engine at £2,800-£4,000 represents 20-40% of the vehicle's value, making replacement a financially sound decision on most examples. Lower-value Insignia A examples (£3,000-£5,000) are approaching the scrap threshold .
Compare B20DTH quotesQuestion 4Can I swap another engine code in place of B20DTH-
Always verify the exact code before ordering. Common related codes include D20DTH, D20DTR, EDC17, but calibration, ancillaries, and emissions hardware can differ.
Compare B20DTH quotesCompare B20DTH Engine Prices Today
The B20DTH is fitted to vehicles typically valued between £4,000 and £14,000. A reconditioned engine at £2,800-£4,000 represents 20-40% of the vehicle's value, making replacement a financially sound decision on most examples. Lower-value Insignia A examples (£3,000-£5,000) are approaching the scrap threshold .
Vetted UK Specialists
Vetted UK specialists for B20DTH replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
Expert Support
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
Compare B20DTH Engine Prices