Hybrid Vehicle MOT Requirements: New 2025 Rules Explained

Hybrid vehicles combine electric and combustion power, creating unique MOT testing requirements. From November 2025, new regulations specifically address hybrid technology, requiring testing of both electric systems (batteries, charging, regenerative braking) and traditional combustion components (emissions, exhaust, fuel system).

This comprehensive guide explains everything about hybrid MOT testing: when hybrids need MOT, the three types of hybrid vehicles (PHEV, HEV, MHEV), what's tested on each, November 2025 rule changes, dual testing requirements, common hybrid-specific failures, and complete preparation guidance.

Do Hybrid Cars Need MOT?

Yes. All hybrid vehicles require MOT testing on the same schedule as conventional cars:

MOT Schedule for Hybrids

First MOT: 3 years after date of first registration Subsequent tests: Annually

Applies to all hybrid types:

• Plug-in Hybrids (PHEVs)
• Full Hybrids (HEVs)
• Mild Hybrids (MHEVs)

Example:

• Toyota Prius first registered: 20 April 2022
• First MOT due: 19 April 2025
• Second MOT due: 19 April 2026
• Continues annually

No exemptions: Hybrid vehicles must meet requirements for both electric and combustion systems.

When is my MOT due? →

Types of Hybrid Vehicles and MOT Differences

Understanding your hybrid type determines what's tested:

Plug-In Hybrid (PHEV)

Characteristics:

• Large battery (8-20 kWh typically)
• Can drive on electric only (20-50 miles)
• Charged from external source
• Petrol or diesel engine
• Complex dual power system

Examples:

• Mitsubishi Outlander PHEV
• BMW 330e
• Mercedes GLE 350de
• Volvo XC60 Recharge
• Range Rover Sport PHEV

MOT Testing:

• Full electric system checks
• Complete combustion engine testing
• Emissions test in combustion mode
• Charging port inspection (from Nov 2025)
• Battery system checks (from Nov 2025)
• Most comprehensive testing

Full Hybrid (HEV / Self-Charging Hybrid)

Characteristics:

• Medium battery (1-2 kWh)
• Cannot charge externally
• Short electric-only range (1-2 miles)
• Regenerative braking charges battery
• Petrol engine (rarely diesel)

Examples:

• Toyota Prius
• Toyota RAV4 Hybrid
• Honda CR-V Hybrid
• Lexus NX Hybrid
• Kia Niro Hybrid

MOT Testing:

• Electric motor and battery checks
• Full emissions testing (petrol engine)
• Regenerative braking system
• No charging port (none fitted)
• Hybrid system warning lights

Mild Hybrid (MHEV)

Characteristics:

• Small battery (48V typically)
• Cannot drive on electric only
• Assists combustion engine
• Start-stop function
• Regenerative energy recovery

Examples:

• Suzuki Vitara Hybrid
• Ford Puma MHEV
• Audi A8 MHEV
• Mercedes E-Class (some models)
• Many modern cars now MHEV

MOT Testing:

• Tested largely as conventional vehicle
• Emissions test (engine always runs)
• Battery and electrical system
• Less complex than PHEV/HEV
• Warning lights must extinguish

What's Tested on Hybrid Vehicles (Current Requirements)

Hybrids undergo all standard MOT checks plus hybrid-specific items:

Standard MOT Checks (All Hybrids)

Lighting and Electrical:

• All external lights functioning
• Dashboard warning lights
• Indicators and hazard lights
• Brake lights (including from regen braking)

Braking System:

• Brake efficiency (50%+ required)
• Brake balance
• Traditional brake operation
• Handbrake function
• Brake fluid level

Tyres and Wheels:

• Tread depth (1.6mm minimum)
• Tyre condition
• Wheel bearings
• Correct tyre pressures (hybrid-specific often)

Steering and Suspension:

• Steering operation
• Suspension condition
• Shock absorbers
• Springs and bushes

Body and Structure:

• Corrosion checks
• Structural integrity
• Seatbelts
• Mirrors and windscreen

Full MOT checklist →

Hybrid-Specific Current Checks

1. Hybrid System Warning Lights

Must extinguish after startup:

• Hybrid system malfunction light
• EV system warning
• Battery warning (high-voltage)
• Charging system warning (PHEV)
• Ready indicator should illuminate

Any permanent warning = automatic fail

2. Emissions Testing (Combustion Mode)

Petrol Hybrids:

• CO (Carbon Monoxide) levels
• HC (Hydrocarbon) levels
• Lambda value (air/fuel ratio)
• Same limits as conventional petrol cars

Diesel Hybrids (rare, mostly PHEVs):

• Smoke opacity test
• DPF present and functioning
• AdBlue system (if Euro 6)

Testing procedure:

• Engine must be running
• Cannot test in electric-only mode
• May need to deplete battery first
• Engine must reach operating temperature

3. Regenerative Braking

Functionality:

• System operates correctly
• Brake lights illuminate during regen braking
• Smooth transition to traditional brakes
• No unusual noises or juddering

4. High-Voltage System (Basic Check)

Currently limited inspection:

• No exposed orange cables
• Battery warning lights off
• No obvious damage to battery area
• High-voltage labels present

Note: More thorough checks from November 2025 (see below).

What's NOT Tested (Yet)

Until November 2025, these aren't formally checked:

• Battery state of health
• Charging port condition (PHEV)
• Electrical insulation integrity
• Battery cooling system
• Detailed high-voltage cable inspection

November 2025: New Hybrid-Specific MOT Requirements

From November 2025, MOT testing introduces comprehensive hybrid and electric system checks:

High-Voltage Battery Inspection

Visual Checks:

• Battery pack casing integrity
• No dents, damage, or deformation
• Seals and gaskets intact
• Mounting bolts secure
• Under-body protection present

Warning Indicators:

• Battery health warnings
• High-voltage system alerts
• Thermal management warnings
• Any permanent warning = fail

Coolant System (liquid-cooled batteries):

• Battery coolant level adequate
• No leaks visible
• Cooling lines intact
• Thermal management functioning

Failure Criteria:

• Damaged battery casing
• Coolant leaks
• Insecure mounting
• Warning lights illuminated
• Missing under-body protection

Electrical System Checks

High-Voltage Cables:

• Orange cables (HV standard) intact
• No exposed wiring
• Insulation not damaged
• Cable routing secure
• Protection covers present

Connectors:

• Secure and sealed
• No corrosion
• No signs of overheating
• Locking mechanisms function

Earth Bonding:

• Proper earth connections
• Bonding straps intact
• No corrosion on connections

Charging Port Inspection (PHEV Only)

Physical Condition:

• Port door operates smoothly
• No damage to port housing
• Locking mechanism functions
• Weather seals intact
• Pins/contacts clean, not burnt

Safety Features:

• Emergency release works
• Port cover seals properly
• No exposed live components
• Cable release functions

Failure Points:

• Damaged or corroded pins
• Non-functioning door
• Broken locking mechanism
• Exposed electrical contacts

Regenerative Braking System

Functionality Test:

• Regen system operates
• Smooth engagement
• Brake light activation
• No error codes
• Consistent behavior

Integration Check:

• Transitions to traditional brakes
• No juddering or harshness
• Proper brake feel
• Warning lights off

Hybrid Power Control Unit

Visual Inspection:

• Secure mounting
• No coolant leaks
• Cooling adequate
• No visible damage
• Cables secure

Operational Check:

• System functions correctly
• No warning lights
• Proper mode switching
• Ready light illuminates

Dual Testing: Electric + Combustion

Hybrids face unique challenge of dual system testing:

Electric Mode Testing

What's Checked:

• Battery system functioning
• Electric motor operation
• Power electronics
• High-voltage system integrity
• Regenerative braking
• EV mode capability (PHEV/HEV)

Testing Approach:

• Visual inspections
• Warning light checks
• System functionality
• Safety verification

Combustion Mode Testing

What's Checked:

• Emissions (petrol or diesel standards)
• Exhaust system integrity
• Engine operation
• Fuel system
• Engine management

Testing Procedure:

1. Engine must be running
2. Operating temperature reached
3. Battery may need depleting (PHEV)
4. Standard emissions test
5. Exhaust visual inspection

The Challenge for PHEVs

Battery Depletion Issue:

• Some PHEVs start in EV mode
• Engine may not run initially
• Emissions test requires engine running
• May need to drive until battery depletes
• Or use "hold" mode if available

Solution:

• Arrive with depleted battery, OR
• Use battery hold/charge mode
• Inform tester of PHEV characteristics
• May take longer than conventional MOT

Common Hybrid MOT Failures

Based on industry data and feedback:

1. Hybrid System Warning Lights (25% of Hybrid Failures)

Common Warnings:

• Hybrid system malfunction
• High-voltage battery warning
• Check hybrid system message
• EV system not available
• Charging system fault (PHEV)

Causes:

• 12V battery issues (very common)
• Software glitches
• Sensor faults
• Genuine system problems
• Battery cooling system

Costs to Fix:

• 12V battery replacement: £150-250
• Software update: £0-100
• Sensor replacement: £100-400
• Hybrid system diagnosis: £80-150
• Major hybrid system repair: £500-2,000+

Prevention:

• Keep 12V battery healthy
• Regular software updates
• Don't ignore warning lights
• Service on schedule

2. Brake Corrosion (20% of Hybrid Failures)

Why Hybrids Affected:

• Regenerative braking reduces traditional brake use
• Discs and pads corrode from lack of use
• Toyota Prius particularly affected
• Urban driving worsens problem

Symptoms:

• Squealing when braking
• Vibration through pedal
• Visible rust on discs
• Longer stopping distances

Costs:

• Disc cleaning: £40-80
• Front brake pads + discs: £200-400
• Rear brake pads + discs: £180-350

Prevention:

• Use traditional brakes regularly
• Reduce regen strength occasionally
• Regular harder braking clears rust
• Annual brake service

3. Tyre Wear (18% of Hybrid Failures)

Why Hybrids Fail:

• Heavier than equivalent petrol cars
• Instant torque (especially PHEV)
• Low rolling resistance tyres wear faster
• Often premium tyres required

Costs:

• Budget tyres: £80-120 each
• Premium tyres: £120-180 each
• Hybrid-specific: £100-160 each

Prevention:

• Check tread monthly
• Rotate tyres every 6,000 miles
• Maintain correct pressures
• Use recommended tyre types

4. Emissions Failures (15% of Petrol Hybrids)

Common Issues:

• Catalytic converter (rarely used = can fail)
• Lambda sensor faults
• Fuel system issues (old fuel from infrequent use)
• Engine management problems

Diesel Hybrid Issues (rare):

• DPF blockage (infrequent use prevents regeneration)
• AdBlue system (diesel PHEVs)
• EGR valve problems

Costs:

• Lambda sensor: £80-200
• Catalytic converter: £300-1,200
• DPF regeneration: £100-200
• DPF replacement: £500-2,000

5. 12V Battery Failures (12% of Hybrid Failures)

Critical System:

• 12V battery powers computer systems
• Hybrid system won't start without it
• Drains faster than conventional cars
• Shorter lifespan (3-5 years vs 5-7)

Symptoms:

• Hybrid system won't ready
• Warning lights
• Can't start vehicle
• Intermittent faults

Cost: £150-250 replacement

Prevention:

• Replace every 4-5 years
• Test voltage annually
• Keep charged (use battery conditioner if stored)

6. Charging Port Damage (10% of PHEV Failures from Nov 2025)

Causes:

• Vandalism
• User damage
• Weather exposure
• Cable impact

Costs:

• Port door: £100-200
• Full port assembly: £300-800

How to Prepare Your Hybrid for MOT

4 Weeks Before MOT

Check MOT History:

• Review previous advisories
• Note hybrid-specific issues
• Plan repairs if needed

Check your MOT history →

Assess Hybrid System:

• Any warning lights?
• System functioning normally?
• Charging working (PHEV)?
• Brakes feel normal?

Check 12V Battery:

• Over 3 years old?
• Voltage test (should be 12.4V+)
• Consider replacement if weak

3 Weeks Before MOT

Use Traditional Brakes:

• Reduce regenerative braking setting
• Use brake pedal more frequently
• Clears surface corrosion
• Do this for 2-3 weeks before MOT

Software Updates:

• Check manufacturer app
• Update if available
• May resolve warning lights
• Some require dealer visit

Inspect Charging Port (PHEV):

• Check for damage
• Clean pins if dusty
• Test locking mechanism
• Ensure door opens smoothly

2 Weeks Before MOT

For Petrol Hybrids - Engine Run:

• Take longer journey (30+ minutes)
• Ensure engine runs at temperature
• Helps catalytic converter
• Clears fuel system

For Diesel Hybrids - DPF Regeneration:

• Extended motorway drive
• 20+ minutes at 50mph+
• Ensures DPF regenerated
• Clears accumulated soot

Check Tyres:

• Tread depth (20p test)
• Look for uneven wear
• Check all four tyres
• Ensure correct pressures

1 Week Before MOT

Complete Standard Checks:

• All lights working
• Windscreen no damage
• Wipers and washers
• Mirrors secure
• Seat belts functioning

Hybrid-Specific Checks:

• No warning lights
• Hybrid system "Ready" illuminates
• EV mode works (PHEV/HEV)
• Regenerative braking operates
• Charging port clean (PHEV)

Check High-Voltage Labels:

• Orange warning labels visible
• Battery area labels present
• Under-bonnet labels intact

Day Before MOT

Charge Battery (PHEV):

• For convenience, OR
• Deplete to force engine use
• Depends on test centre preference

Engine Warm-Up:

• Drive 15-20 minutes
• Ensure engine at temperature
• Critical for emissions test

Final Inspection:

• Walk around check
• No warning lights
• Clean and tidy vehicle

Hybrid MOT Costs

Test Fees

Standard MOT: £54.85 maximum (same as all cars) Actual cost: £30-55 depending on garage No hybrid premium: Test fee identical to conventional cars

Common Hybrid Repair Costs

12V Battery: £150-250 Brake pads and discs: £200-400 per axle Tyres: £100-180 each (hybrid-specific) Hybrid system diagnosis: £80-150 Software updates: £0-100 (some free) Charging port repair: £100-800 High-voltage battery repair: £1,000-5,000 (rare, usually warranty)

Total Budget for Hybrid MOT

Well-maintained hybrid: £55-150 Moderate issues: £200-450 Major problems: £500-1,200

Compared to conventional:

• Similar overall costs
• Different failure types
• 12V battery more critical
• Brake corrosion more common
• Emissions often better (petrol hybrids)

Manufacturer-Specific Considerations

Toyota/Lexus Hybrids

Known Issues:

• Brake corrosion (Prius especially)
• 12V battery lifespan short
• Generally reliable hybrid systems
• Extensive dealer network

MOT Tips:

• Service at Toyota for battery health checks
• Use brakes normally pre-MOT
• Replace 12V battery every 4 years

BMW/Mercedes PHEVs

Known Issues:

• Complex systems
• Expensive parts
• Software updates crucial
• Dealer service recommended

MOT Tips:

• Keep software updated
• Check charging port condition
• Premium garage may have more PHEV experience

Mitsubishi Outlander PHEV

Known Issues:

• Under-body protection damage
• Charging port wear
• 12V battery issues

MOT Tips:

• Check under-body annually
• Clean charging port regularly
• Inspection at Mitsubishi dealer helpful

Volvo Recharge Models

Known Issues:

• Software bugs (updates resolve)
• 12V battery drain
• Generally reliable

MOT Tips:

• Always updated to latest software
• Check for recalls

Hybrid vs Electric vs Petrol MOT Comparison

November 2025 Checklist for Hybrids

From November 2025, ensure these are checked pre-MOT:

Battery System:

• No visible damage to battery pack
• Under-body protection intact
• Battery coolant level adequate (if applicable)
• No coolant leaks visible
• Mounting secure

High-Voltage Cables:

• Orange cables intact
• No exposed wiring
• Protection covers present
• Insulation not damaged

Charging Port (PHEV):

• Port door operates
• Pins clean, not corroded
• Locking mechanism works
• Weather seal intact

Hybrid System:

• No warning lights
• Ready indicator illuminates
• EV mode functions (if applicable)
• Regenerative braking works
• Smooth mode transitions

High-Voltage Labels:

• Battery warning labels present
• Labels not faded or missing
• Under-bonnet labels visible

Frequently Asked Questions

Do plug-in hybrids need MOT?

Yes, all plug-in hybrids (PHEVs) need MOT after 3 years, then annually. PHEVs face the most comprehensive testing as they're checked in both electric and combustion modes, including emissions testing and charging system inspection.

Are hybrid MOT tests more expensive?

No, the test fee is identical (maximum £54.85). However, hybrid repairs can be different - brake corrosion is more common (£200-400), while emissions failures may be less frequent than conventional cars.

Will my hybrid battery be tested in MOT?

From November 2025, yes. The battery casing, mounting, cooling system, and warning lights will be checked. However, battery capacity and state of health are NOT formally tested - only visible damage and warnings cause failure.

Do I need to deplete PHEV battery before MOT?

It depends on the test centre. Some prefer battery depleted so engine runs for emissions test. Others can use battery hold mode. Contact garage beforehand to ask their preference for PHEVs.

Can hybrid cars fail on brake corrosion?

Yes, this is common. Hybrids use regenerative braking, reducing traditional brake use. This causes discs and pads to corrode. Prevention: use traditional brakes regularly for 2-3 weeks before MOT.

What if hybrid warning light is on?

Any illuminated hybrid system warning light causes automatic MOT failure. Common causes include 12V battery issues (£150-250 to replace), sensor faults, or software glitches. Get diagnostic scan (£80-150) before MOT.

Do mild hybrids need emissions testing?

Yes, all mild hybrids need full emissions testing as the engine runs constantly. They cannot drive on electric-only power, so are tested similarly to conventional vehicles but with additional hybrid system checks.

How long does hybrid MOT take?

Currently 40-60 minutes (longer if battery needs depleting for PHEV). From November 2025, expect 45-65 minutes due to additional battery and electrical system inspections.

Conclusion

Hybrid vehicles require comprehensive MOT testing covering both electric and combustion systems. From November 2025, new requirements specifically address hybrid technology:

Key Hybrid MOT Challenges:

• Dual system testing (electric + combustion)
• Brake corrosion from regenerative braking
• 12V battery critical for hybrid system
• Emissions still required (engine mode)
• New battery/charging checks (Nov 2025)

Preparation Essentials:

• Use traditional brakes regularly (2-3 weeks pre-MOT)
• Check 12V battery (replace if 3+ years old)
• Address warning lights immediately
• Keep software updated
• Inspect charging port (PHEV)
• Engine warm-up for emissions test

Hybrid Types Matter:

• PHEV: Most comprehensive testing (both systems)
• HEV: Full hybrid checks, no charging port
• MHEV: Tested mostly as conventional vehicle

Cost Comparison:

• Similar to conventional cars overall
• Different failure patterns
• Brake corrosion more likely
• High-voltage repairs expensive (but rare)

Check your hybrid's MOT history to see previous test results, advisories, and prepare for common hybrid-specific issues.

Check your hybrid vehicle's MOT history → - Free results showing all past tests, hybrid-specific advisories, and complete record.

Understanding hybrid-specific requirements and preparing accordingly ensures your plug-in hybrid, full hybrid, or mild hybrid passes MOT successfully under both current and new 2025 regulations.