J
Jimmy
★★★★★
“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
ENGINEMARKET
Toyota ENGINE MARKETPLACE
Toyota Mirai Engine ReplacementCompare Prices & Save
Get quotes today from trusted UK Toyota Mirai engine specialists. Compare prices on reconditioned, rebuilt and used fuel cell systems - supply & fit available nationwide.
Mirai Fuel Cell Stack Replacement - from £4,000 to £15,000
-> Rebuilt units from £4,000 · Common components: FC Stack, MEA Assembly, Stack Controller
Mirai Hydrogen Tank Replacement - from £2,000 to £4,000
-> Rebuilt units from £2,000 · Common components: Type IV Tank, Pressure Regulator, Recirculation Pump
Mirai DC/DC Converter & Power System - from £800 to £4,000
-> Rebuilt units from £800 · Common components: DC/DC Converter, Power Converter, Hydrogen Injector
🔒 Secure enquiry - no spam, no pressure. Genuine quotes only from vetted UK Toyota Mirai specialists.
● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|
● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|● Instant Quotes · No Obligation · 100% Free · Reconditioned · Rebuilt · Used · Supply & Fit Available · UK-Wide Network|
How It Works
3 Simple Stepsto Finding the Best Toyota Mirai Replacement Engine
Get Instant Quotes from Toyota Engine Specialists Across the UK - 100% free, no obligation. Most replacements completed within 3-5 days.
Most replacements completed within 3-5 days.
12-Month Warranty
Supply & Fit Available
Nationwide Delivery
Trusted UK Suppliers
Live UK Engine Market Data
What Are UK Drivers Paying for Toyota Mirai Engine Replacement?
The table below shows typical UK rebuilt fuel cell system costs across Toyota Mirai variants - compare failure causes, component codes, hydrogen system specs, and price ranges to benchmark what UK drivers are paying.
Average Market Prices
- Toyota Mirai (Gen 2) Power Converter Unit2021-2024£1,200-£4,000Inverter failurePCU-INV-02Hydrogen FCEV
- Toyota Mirai (Gen 1) First Generation FC Stack2015-2020£4,000-£12,000FC stack degradationJPD10-FCHydrogen FCEV
- Toyota Mirai (Gen 2) Second Generation FC Stack2021-2024£6,000-£15,000DC/DC overvoltageJPD20-FCHydrogen FCEV
- Toyota Mirai (Gen 1) Hydrogen Tank System2015-2020£2,000-£4,000Tank seal leakH2-TANK-700Hydrogen 5.6kg
- Toyota Mirai (Gen 2) Hydrogen Tank System2021-2024£2,500-£4,500Pressure regulator faultH2-TANK-700BHydrogen 5.6kg
- Toyota Mirai (Gen 1) DC/DC Boost Converter2015-2020£800-£2,500Converter overvoltageDCDC-BOOST-01Hydrogen FCEV
Last updated: 31 May, 08:53
Customer Reviews
Trusted by Toyota Mirai OwnersAcross the UK
★★★★★
4.8 out of 5
Rated 4.8 out of 5 by 1,081 verified customers who sourced reconditioned and used Toyota Mirai engines through EngineMarket.
P
Pete
★★★★★
“Got three quotes within an hour and chose the best deal easily. The whole process was quick, clear and stress-free.”
S
Sophie
★★★★★
“I wasn't sure what I needed, but they helped me identify the right engine and connected me with a trusted garage.”
Google
★★★★★
“
Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
- Jimmy, London
Highly Rated Experience - Leave a Review
Leave a review → - Your feedback helps other Toyota Mirai owners find trusted engine specialists.
Models We Cover
Toyota Mirai Engine ReplacementAll Variants Covered
From the entry-level Design to the top-spec Design Premium Pack, compare rebuilt, reconditioned and used fuel cell system prices through our network of UK Toyota Mirai FCEV specialists - typical price range for a rebuilt FC stack with 12‑month warranty, supply & fit available nationwide.
Core Petrol Range
Specs
Years2015-2020
Rebuilt£4,000-£12,000
Variant Directory
All Toyota Mirai Variants - Fuel Cell Replacement Coverage
A full alphabetical listing of every Toyota Mirai trim covered by our network. All entries link to a dedicated variant page, where prices are further broken down by generation, component type, and condition. Click a live link to compare quotes.
Engine Codes
Toyota Mirai Engine CodesFull Technical Specifications & Replacement Guide
Every fuel cell and hydrogen system component fitted to the Toyota Mirai across both generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK FCEV specialists. Select any component to compare quotes.
Petrol Engines
Extracted from detailed petrol and performance engine families across Toyota Mirai variants.
Can't find your engine code?
Can't find your component code? Enter your registration number above - we'll instantly identify the exact fuel cell system, its technical specifications, and live replacement prices from UK Toyota Mirai FCEV specialists. Every rebuilt component comes with a minimum 12‑month unlimited mileage warranty.
Common Problems
Toyota Mirai Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
1. Fuel Cell Stack Degradation
Why Mirai FC Stacks Lose Power Over Time
Affected Models
Toyota Mirai Design, Design Plus, Design Premium Pack (2015-2024, JPD10-FC & JPD20-FC)
Typical Failure Mileage
40,000-70,000 miles
Root Cause
Membrane electrode assembly wear and catalyst layer degradation reduce proton exchange efficiency, triggering warning lights and power loss.
Repair Options & Estimated Costs (UK ranges)
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Diagnostic & Stack Conditioning - Software reset and performance calibration Minor | £300 - £800 | £150 - £400 | Dealer-level diagnostics, stack conditioning cycle, ECU reflash | Temporary mitigation; does not reverse physical degradation |
MEA Module Replacement - Replace membrane electrode assembly only Minor | £2,500 - £6,000 | £1,800 - £4,000 | Partial stack disassembly, MEA replacement, seal renewal, bench testing | Viable if stack housing is intact; 20,000-40,000 mile extension |
Full Replacement - Rebuilt FC Stack - Complete refurbished fuel cell stack unit Best Value | £4,000 - £15,000 | £3,200 - £12,000 | Supply & fit of rebuilt stack, upgraded MEA, full system calibration, 12-month warranty | Recommended for high-mileage vehicles; restores near-new performance |
Our Recommendation
Best next step for fuel cell stack degradation
On a Mirai valued under £15,000, a full rebuilt FC stack often represents better long-term value than partial repairs. For newer second-gen models under warranty, pursue dealer conditioning first.
Toyota Mirai Engine Problems
What It Costs to Fix & When Replacement Makes Sense
Affected Models
Toyota Mirai Design, Design Plus, Design Premium Pack (2015-2024, JPD10-FC & JPD20-FC)
Typical Failure Mileage
40,000-70,000 miles
Root Cause
Membrane electrode assembly wear and catalyst layer degradation reduce proton exchange efficiency, triggering warning lights and power loss.
Diagnostic & Stack Conditioning - Software reset and performance calibration
Dealer
£300 - £800
Specialist
£150 - £400
Dealer-level diagnostics, stack conditioning cycle, ECU reflash
Temporary mitigation; does not reverse physical degradation
MEA Module Replacement - Replace membrane electrode assembly only
Dealer
£2,500 - £6,000
Specialist
£1,800 - £4,000
Partial stack disassembly, MEA replacement, seal renewal, bench testing
Viable if stack housing is intact; 20,000-40,000 mile extension
Full Replacement - Rebuilt FC Stack - Complete refurbished fuel cell stack unit
Dealer
£4,000 - £15,000
Specialist
£3,200 - £12,000
Supply & fit of rebuilt stack, upgraded MEA, full system calibration, 12-month warranty
Recommended for high-mileage vehicles; restores near-new performance
Our Recommendation
Best next step for fuel cell stack degradation
On a Mirai valued under £15,000, a full rebuilt FC stack often represents better long-term value than partial repairs. For newer second-gen models under warranty, pursue dealer conditioning first.
Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of FCEV specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EngineMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Toyota Mirai and fuel cell system. Every component supplied through EngineMarket carries a minimum 12‑month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
12-Month Warranty
Upgraded Components
Nationwide UK Delivery
Save vs Main Dealer Price
Replacement Engine Options
Toyota Mirai Engine TypesOptions, Costs & What to Expect
Every fuel cell system component type is available through our UK FCEV specialist network with typical price ranges based on Mirai generation, component code and budget.
All fuel cell components include a minimum 12‑month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our FCEV specialist network and depend on exact component code, generation, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Toyota Mirai within hours.
Engine Sizes
Toyota Mirai Engines by SizeFind the Right Displacement for Your Variant
Toyota Mirai Hydrogen FCEV Power Systems
The 134kW fuel cell system powers all UK Toyota Mirai variants across both generations, delivering 182hp equivalent output with zero tailpipe emissions. First-generation JPD10 stacks (2015-2020) established Toyota's production FCEV technology, while second-generation JPD20 units (2021-present) feature refined thermal management and improved durability.
| Engine Code(s) | JPD10-FC, JPD20-FC, H2-TANK-700, DCDC-BOOST-01 |
| Compatible Models (UK) | Design, Design Plus, Design Premium Pack |
| Production Years | Gen 1: 2015-2020; Gen 2: 2021-2024 |
Common Failure Points
Watch for these known weak points
FC stack MEA degradation, DC/DC converter overvoltage, hydrogen tank seal leaks
Not sure which fuel cell system your Toyota Mirai needs? Enter your registration number above - we'll identify the exact generation, component codes and compatible replacement options instantly. All components supplied through EngineMarket include a minimum 12‑month unlimited mileage warranty from UK Toyota Mirai FCEV specialists.
Toyota Mirai Engines Fuel Type
Toyota Mirai Engines by Fuel Type
Toyota Mirai Hydrogen Fuel Cell (FCEV) Systems
Toyota Mirai Hydrogen Fuel Cell (FCEV) Systems
All UK Toyota Mirai variants use a 134kW hydrogen fuel cell electric powertrain with 700bar Type IV hydrogen storage; replacement demand focuses on FC stack degradation and power electronics failures.
Common Toyota Mirai FCEV Component Families
JPD10-FC - First-gen FC stack (2015-2020), MEA degradation risk at 50k miles
JPD20-FC - Second-gen refined FC stack (2021-present), improved thermal management
H2-TANK-700 - 700bar Type IV hydrogen storage, seal leakage common at high mileage
DCDC-BOOST-01 - DC/DC converter, known overvoltage failure on first-gen models
Found In
First Generation (2015-2020) - JPD10-FC, H2-TANK-700, DCDC-BOOST-01
Second Generation (2021-2024) - JPD20-FC, H2-TANK-700B, PCU-INV-02
Known For
Zero tailpipe emissions with water vapour only
FC stack warning light typically appears around 50,000 km / 3 years
DC/DC converter overvoltage causes sudden shutdowns on first-gen models
Hydrogen tank work requires FCEV-certified technicians and safety protocols
Typical FCEV Models
Toyota Mirai Design
Toyota Mirai Design Plus
Toyota Mirai Design Premium Pack
Important Notes
No petrol, diesel or hybrid variants of the Toyota Mirai exist in the UK market
FC stack and hydrogen tank replacement requires FCEV-certified specialists only
Genuine Toyota parts and warranty coverage are critical for high-cost FCEV repairs
Hydrogen refuelling infrastructure availability should be considered before major repairs
Not sure which fuel cell system your Toyota Mirai has? Enter your registration number above to instantly identify your generation, component codes and compatible replacement options - all backed by a minimum 12‑month unlimited mileage warranty from UK Toyota Mirai FCEV specialists.
Engine Years
Toyota Mirai Engines by YearWhat Was Fitted & When
This section covers all major fuel cell system changes across the Toyota Mirai's UK production timeline, organised so owners can quickly identify their generation and compare rebuilt component prices from FCEV specialists.
2015 - 2020 - First Generation Launch & Maturation
Major Platform Change
The original Mirai introduced Toyota's production FCEV technology to the UK market with the JPD10 fuel cell stack and 700bar hydrogen storage.
Key Changes
2015: UK launch of First Generation Mirai with JPD10-FC fuel cell stack
2017: Minor software updates to FC stack control logic
2019: Updated hydrogen tank seal specifications to reduce leakage risk
Known For
Pioneering UK FCEV with zero tailpipe emissions
FC stack MEA degradation warnings common around 50,000 km
DC/DC converter overvoltage causing sudden system shutdowns
High replacement costs relative to vehicle depreciation
Main Engines
JPD10-FC - 134kW hydrogen FCEV (Design / Design Plus / Design Premium Pack)
H2-TANK-700 - 700bar Type IV hydrogen storage (All trims)
DCDC-BOOST-01 - DC/DC boost converter (All trims)
Popular Models
Toyota Mirai Design
Toyota Mirai Design Plus
Toyota Mirai Design Premium Pack
Engine Codes Covered
JPD10-FCH2-TANK-700DCDC-BOOST-01PCU-INV-01
Common Replacement Enquiries
Toyota Mirai fuel cell stack replacement
Mirai DC/DC converter failure
Hydrogen tank leak repair
Get quotes for 2015-2020 Toyota Mirai fuel cell replacement
2015 - 2020 - First Generation Launch & Maturation
Major Platform Change
The original Mirai introduced Toyota's production FCEV technology to the UK market with the JPD10 fuel cell stack and 700bar hydrogen storage.
Key Changes
2015: UK launch of First Generation Mirai with JPD10-FC fuel cell stack
2017: Minor software updates to FC stack control logic
2019: Updated hydrogen tank seal specifications to reduce leakage risk
Known For
Pioneering UK FCEV with zero tailpipe emissions
FC stack MEA degradation warnings common around 50,000 km
DC/DC converter overvoltage causing sudden system shutdowns
High replacement costs relative to vehicle depreciation
Main Engines
JPD10-FC - 134kW hydrogen FCEV (Design / Design Plus / Design Premium Pack)
H2-TANK-700 - 700bar Type IV hydrogen storage (All trims)
DCDC-BOOST-01 - DC/DC boost converter (All trims)
Engine Codes Covered
JPD10-FCH2-TANK-700DCDC-BOOST-01PCU-INV-01
Popular Models
Toyota Mirai Design
Toyota Mirai Design Plus
Toyota Mirai Design Premium Pack
Common Replacement Enquiries
Toyota Mirai fuel cell stack replacement
Mirai DC/DC converter failure
Hydrogen tank leak repair
Get quotes for 2015-2020 Toyota Mirai fuel cell replacement
Year Finder
Not sure which year your Toyota Mirai was built?
Not sure which year your Toyota Mirai was built? Enter your registration number and we'll identify the exact generation, fuel cell system, and compatible replacement options instantly - all backed by a minimum 12‑month warranty from UK Toyota Mirai FCEV specialists.
FAQ
Toyota Mirai Engine ReplacementFrequently Asked Questions
Question 1
How much does it cost to replace a Toyota Mirai fuel cell stack?
Replacing a Toyota Mirai fuel cell stack typically costs £4,000-£15,000 depending on generation and whether you choose rebuilt, reconditioned or used components. First-generation JPD10 stacks are generally less expensive than second-generation JPD20 units.
Key points
- • First-gen JPD10 rebuilt stacks: £4,000-£12,000 supply only
- • Second-gen JPD20 rebuilt stacks: £6,000-£15,000 supply only
- • Supply & fit labour adds £800-£2,500 depending on specialist
- • Warranty coverage may reduce or eliminate owner costs
Question 2
Does the Toyota Mirai have a traditional engine?
No, the Toyota Mirai uses a hydrogen fuel cell electric powertrain, not a conventional internal combustion engine. It generates electricity from hydrogen and oxygen to power an electric motor, emitting only water vapour.
Key points
- • Fuel cell stack replaces traditional engine block
- • 134kW output equivalent to 182hp conventional engine
- • No engine oil, spark plugs or exhaust system required
- • Requires hydrogen refuelling infrastructure, not petrol/diesel
Question 3
Is it worth replacing the fuel cell on an older Toyota Mirai?
It depends on your Mirai's value, mileage and warranty status. On a first-gen Mirai valued under £15,000, a £5,000-£10,000 FC stack replacement may not be economical unless covered by warranty or extended coverage.
Key points
- • First-gen Mirai values: £8,000-£20,000 depending on condition
- • Second-gen Mirai values: £25,000-£45,000 typically
- • Check Toyota warranty and any extended FCEV coverage first
- • Consider selling as-is vs investing in major FCEV repairs
Question 4
How long does a Toyota Mirai fuel cell stack last?
Toyota designs Mirai fuel cell stacks for 150,000+ miles, but real-world degradation warnings often appear around 50,000 km (31,000 miles) or 3 years, especially on first-generation models.
Key points
- • Manufacturer target lifespan: 150,000+ miles
- • Common warning light trigger: ~50,000 km / 3 years
- • Second-generation JPD20 stacks show improved durability
- • Regular hydrogen system maintenance extends component life
Question 5
What causes Toyota Mirai DC/DC converter failure?
DC/DC converter overvoltage failures on first-generation Mirai are typically caused by capacitor degradation and thermal stress, triggering sudden system shutdowns as a safety precaution.
Key points
- • Capacitor wear reduces voltage regulation capability
- • Thermal cycling accelerates component degradation
- • Software updates can mitigate but not prevent hardware failure
- • Rebuilt converters with upgraded capacitors offer longer life
Question 6
Is the Toyota Mirai hydrogen tank safe after replacement?
Yes, when replaced by an FCEV-certified specialist using genuine or certified rebuilt Type IV tanks with full pressure certification and documentation, hydrogen tank safety is maintained to original standards.
Key points
- • Type IV tanks use carbon-fibre composite with polymer liner
- • Replacement requires certified technician and pressure testing
- • Full documentation provided for warranty and MOT compliance
- • Never attempt DIY hydrogen system repairs
Question 7
Does Toyota warranty cover Mirai fuel cell stack replacement?
Toyota's standard warranty covers the fuel cell stack for 3 years/60,000 miles in the UK; extended FCEV component coverage may apply - check your specific vehicle's warranty documentation.
Key points
- • Standard warranty: 3 years / 60,000 miles on FC stack
- • Some models may have extended FCEV component coverage
- • Warranty claims require Toyota dealer or approved FCEV specialist
- • Keep full service history to support warranty claims
Question 8
Can any garage replace a Toyota Mirai hydrogen system?
No, hydrogen system work on the Mirai requires FCEV-certified technicians with specialised training, equipment and safety protocols. Only use Toyota dealers or approved FCEV specialists.
Key points
- • Hydrogen handling requires specific safety certification
- • FC stack calibration needs Toyota-level diagnostic tools
- • Improper installation can void warranty and create safety risks
- • EngineMarket connects you only with vetted FCEV specialists
Question 9
How long does it take to replace a Mirai fuel cell stack?
A complete Toyota Mirai fuel cell stack replacement typically takes 1-3 working days depending on specialist workload, parts availability and whether additional hydrogen system components require attention.
Key points
- • Standard replacement time: 1-3 working days
- • Parts availability can affect turnaround, especially for Gen 2
- • Post-installation calibration and testing adds several hours
- • Supply & fit quotes include estimated completion time
Question 10
What are the symptoms of Toyota Mirai fuel cell failure?
Common symptoms include the "Check Fuel Cell System" warning light, reduced power output, decreased driving range, unusual noises from the FC stack area, or sudden system shutdowns while driving.
Diagnose your Toyota Mirai fuel cell warning symptomsWhy Choose Us
Why UK Toyota Mirai Owners Trust EngineMarket
Find the best Toyota Mirai engine replacement near you
Compare engine prices for Toyota Mirai in the UK and get competitive quotes from garages near you.
100% FreeNo ObligationFast & secure processUK-based support
Trusted supplier network
Warranty-backed rebuilt & used options
Every quote checked for fitment, quality and lead time.