MOT Changes Coming in 2025: What You Need to Know
New regulations and testing procedures being introduced for UK vehicle MOT tests. Here's everything drivers need to know about the upcoming changes.
New Emissions Testing Standards
From May 2025, MOT testing will introduce stricter emissions checks for diesel vehicles. The new standards aim to identify vehicles with removed or tampered diesel particulate filters (DPFs) more effectively.
Enhanced DPF checks
Testers will perform visual inspections and emissions readings to verify DPF presence and function. Missing or gutted filters will result in automatic failure. Previously, some modified vehicles passed despite illegal DPF removal.
Lower smoke opacity limits
Acceptable smoke density levels reduced by 20% for diesel vehicles registered after 2014. This catches vehicles with worn injectors or turbo issues earlier. Owners may need preventive maintenance to pass.
AdBlue system verification
Vehicles fitted with AdBlue systems will have fluid levels checked and warning light function verified. Empty AdBlue or bypass modifications will result in major failure. Keep topped up before testing.
Electric Vehicle Testing Updates
As EVs become more common, MOT testing evolves to address their unique requirements. New procedures cover battery condition, charging systems, and high-voltage safety.
Battery health indicators
Testers will check for dashboard warnings related to battery degradation or cell imbalance. While actual capacity won't be measured, warning lights indicating significant battery issues will cause advisories. This helps identify vehicles needing expensive battery replacements.
High voltage safety checks
Visual inspection of orange high-voltage cables for damage, chafing, or improper repair. Any exposed HV components or DIY repairs will fail immediately due to serious safety risks. Only qualified technicians should work on EV powertrains.
Charging port condition
Charging ports inspected for damage, corrosion, or loose connections. Damaged ports pose fire risks and will result in failure. Regular cleaning and inspection recommended to prevent issues.
ADAS System Testing
Advanced Driver Assistance Systems (ADAS) testing becomes mandatory for vehicles equipped with these safety features. Lane departure warnings, automatic emergency braking, and adaptive cruise control will be verified.
Camera and sensor checks
Visual inspection ensures cameras and sensors are clean, unobstructed, and properly mounted. Dashboard warnings about ADAS malfunctions will result in major failure. Windscreen replacements must include proper camera recalibration.
Warning light verification
ADAS warning lights must illuminate during startup and extinguish normally. Permanent warnings indicate system faults requiring diagnosis. Many modern vehicles rely on these systems for Euro NCAP safety ratings.
Post-repair calibration
After accidents or windscreen replacement, ADAS systems need professional recalibration. MOT will check for uncalibrated systems through warning lights or visual inspection. Costs £100-300 but essential for safety.
Tyre Tread Depth Changes
While the legal minimum remains 1.6mm, MOT advisories will now be issued at 3mm for increased safety awareness. This helps drivers plan replacements before reaching the legal limit.
3mm advisory threshold
Tyres with 3mm or less tread receive advisory notices. While not a failure, this warns owners that replacement is needed soon. Braking distances increase significantly below 3mm, especially in wet conditions.
Uneven wear patterns
More stringent checks for unusual wear indicating alignment or suspension issues. Edge wear, cupping, or bald patches across the tread will be noted. Addressing underlying problems prevents premature tyre replacement.
What Vehicle Owners Should Do
- Diesel owners: Have DPF and emissions system checked before May 2025
- EV owners: Inspect HV cables and charging ports for any damage
- ADAS-equipped vehicles: Ensure all cameras and sensors are clean and functional
- All drivers: Consider replacing tyres before they reach 3mm tread depth
- Check dashboard for any warning lights and address before MOT
- Keep service records showing emissions system maintenance
Penalties for Non-Compliance
Fines for driving without valid MOT increase from £1,000 to £2,500 from April 2025. DVSA enforcement includes automated ANPR cameras detecting expired MOT certificates. Police can now issue fixed penalties roadside.
Insurance companies may refuse claims if the vehicle lacked valid MOT at the time of accident, even if the fault wasn't MOT-related. This makes keeping current MOT certificates more important than ever.
Check Your MOT Status
Verify your current MOT expiry date and view full test history to identify potential issues before your next test.
Check MOT History