If your vehicle fails its MOT test, you’ll receive an MOT Refusal Certificate (VT30), detailing the reason for failure and the relevant MOT failure codes. This information is also logged in the DVSA MOT database.
At Ashroad Service Centre, we know how stressful an MOT fail can be, but it’s often avoidable. Understanding the failure codes helps you identify what went wrong and how to fix it quickly.
Read on to learn what these codes mean and discover the most common reasons for MOT failures.
What Is an MOT Test?
An MOT (Ministry of Transport) test is a mandatory annual inspection for vehicles over three years old. It checks key safety, emissions, and roadworthiness components to ensure your car meets legal standards.
If your car fails, you may qualify for a FREE MOT retest at Ashroad Service Centre. Ask our team for details.
Not sure when your MOT is due? Enter your vehicle registration below to check your MOT status in seconds!
Understanding Your MOT Failure Certificate
Your MOT failure sheet lists the specific code related to the section of the test where the vehicle failed.
For example, code 6.1.b.2 breaks down as follows:
- Section 6: Body, Structure, and General Items
- Sub-section 1 (b): Subject of inspection
- Reason 2: The exact cause of the failure
Below you’ll find the main MOT test sections that generate failure codes, along with what each covers.
Lamps, Reflectors, and Electrical Equipment
Your lighting and electrical systems are vital for visibility and signalling. This includes lamps, reflectors, indicators, horns, and battery wiring. If your engine warning light is illuminated during the MOT, the vehicle will fail, as it can indicate safety and emissions issues.
Items Checked:
- 1.1 Front and Rear Position Lamps and Registration Plate Lamps
- 1.2 Stop Lamps
- 1.3 Rear Fog Lamps
- 1.4 Direction Indicators and Hazard Warning Lamps
- 1.5 Rear Reflectors
- 1.6 Audible Warning (Horn)
- 1.7 Headlamps
- 1.8 Headlamp Aim
- 1.9 Electrical Wiring and Battery
Test all lights before your MOT to avoid minor but costly failures.
Steering and Suspension
Your steering and suspension ensure control, comfort, and safety. Testers inspect for wear, damage, and corrosion. Suspension systems are checked using lifts and movement tests for integrity.
Items Checked:
- 2.1 Steering Control
- 2.2 Steering System
- 2.3 Power Steering
- 2.4 Suspension – General (including springs, arms, linkages, and subframes)
- 2.5 Front Suspension, Wheel Bearings and Drive Shafts
- 2.6 Rear Suspension and Wheel Bearings
- 2.7 Shock Absorbers
Brakes
Your braking system must perform effectively and evenly. MOT testers measure braking efficiency, balance, and condition using roller brake testers.
Items Checked:
- 3.1 Parking Brake Control
- 3.2 Hand-Operated Brake Valves
- 3.3 Service Brake Control (Hydraulic, Air or Vacuum)
- 3.4 ABS and Stability Control Systems
- 3.5 Mechanical Brake Components
- 3.6 Brake Pipes, Hoses, Valves, and Servos
- 3.7 Brake Performance Tests
- 3.8 Brake Efficiency Calculations
If your brake pads are under 1.5mm, your vehicle will fail its MOT. We recommend replacing them at 3mm for safety.
Tyres and Road Wheels
Tyres must be safe, correctly fitted, and have at least 1.6mm of tread depth. Road wheels are inspected for cracks, distortion, and secure fittings.
Items Checked:
- 4.1 Tyres – Type, Structure, Load Rating, and Tread Depth
- 4.2 Road Wheels – Fixing, Condition, and Compatibility
We stock a full range of premium and budget tyres.
Seat Belts and Supplementary Restraint Systems (SRS)
Seat belts and airbags are checked for fitment, security, and operation. Defective seat belts or malfunctioning SRS warning lights will lead to failure.
Items Checked:
- 5.1 Seat Belt Requirements
- 5.2 Seat Belt Condition
- 5.3 Seat Belt Installation (where applicable)
- 5.4 Supplementary Restraint Systems
Check that all belts click, retract smoothly, and lock correctly.
Body, Structure & General Items
Your vehicle’s structure must be sound and free from significant corrosion or damage. MOT testers also check seats, doors, and registration plates.
Items Checked:
- 6.1 Vehicle Structure and Mountings
- 6.2 Seats and Doors
- 6.3 Registration Plates and VIN
- 6.4 Load Security and Spare Wheel
- 6.5 Speed Limiter (where fitted)
- 6.6 Towbars
- 6.7 Speedometer and Driving Controls
We offer corrosion inspections and welding repairs to help you pass your MOT first time.
Exhaust, Fuel, & Emissions
Testers ensure that your exhaust and fuel systems are secure, leak-free, and meet emissions standards.
Items Checked:
- 7.1 Exhaust System
- 7.2 Fuel System
- 7.3 Exhaust Emissions – Petrol (BET and CAT Tests)
- 7.4 Exhaust Emissions – Diesel (Smoke Test)
A failed emissions test often means your catalytic converter, DPF, or sensors need attention. We can diagnose and repair all emission issues.
Driver’s View of the Road
Visibility is crucial for safe driving. MOT testers sit in the driver’s seat to check windscreen clarity, mirrors, and wipers.
Items Checked:
- 8.1 View to Rear
- 8.2 Wipers and Washers
- 8.3 Windscreen (Damage and Obstruction)
- 8.4 Bonnet Security
Make sure your windscreen is clear of chips or cracks, especially in the driver’s field of vision.
Avoid MOT Failure with Ashroad Service Centre
Prevent small issues from turning into MOT failures. Book a Pre-MOT Inspection or Free Vehicle Safety Check with Ashroad Service Centre and drive with peace of mind.
- DVSA-approved MOT Testing Station
- Free Retests (Terms Apply)
- Honest Advice, No Hidden Costs
- Expert Repairs for All Makes and Models
Call us today or book online, we’ll make sure your vehicle passes with confidence.