MOT & Wing Mirrors: Crack or Clear View?

When you're behind the wheel, your awareness of the road isn't limited to what's directly in front of you. A significant portion of your crucial situational awareness comes from your wing mirrors. These seemingly simple components are, in fact, incredibly sophisticated safety devices, providing vital rear and side visibility that helps you navigate traffic, change lanes, and park safely. Given their critical role, it's no surprise that wing mirrors are a key focus during the annual MOT test, scrutinised for their condition and functionality to ensure your vehicle meets stringent road safety standards.

Understanding the exact requirements for wing mirrors during an MOT can be a perplexing task for many motorists. A common concern revolves around damage – specifically, whether a crack, chip, or even a missing piece of glass could lead to an immediate MOT failure. This comprehensive guide aims to demystify these regulations, providing you with all the essential information to ensure your mirrors are not only compliant but also fully functional for your peace of mind on UK roads.

The Indispensable Role of Wing Mirrors on the Road

Beyond simply allowing you to see behind your vehicle, wing mirrors are fundamental to proactive and defensive driving. They enable drivers to:

• Monitor Blind Spots: Even with modern blind-spot monitoring systems, a quick glance at your wing mirror is often the most reliable way to check areas not visible through the rear-view mirror.
• Execute Safe Lane Changes: Before merging or changing lanes, a clear view of adjacent traffic is paramount. Mirrors provide this crucial information, helping prevent collisions.
• Manoeuvre and Park: Reversing into a tight spot or navigating narrow streets relies heavily on accurate mirror feedback to avoid obstacles and other vehicles.
• Maintain Situational Awareness: Constantly monitoring traffic flow around your vehicle, understanding the position of other road users, and anticipating potential hazards are all aided by well-adjusted, clear mirrors.

Without properly functioning wing mirrors, a driver's field of vision is severely compromised, significantly increasing the risk of accidents. This is precisely why the Driver and Vehicle Standards Agency (DVSA) places such emphasis on their condition during the MOT.

MOT Standards for Wing Mirrors: What Inspectors Are Looking For

During the MOT test, inspectors don't just give your mirrors a cursory glance. They meticulously check several aspects to ensure they meet the required safety standards. The primary goal is to ascertain that the mirrors provide an adequate view to the rear and side, are securely fitted, and do not pose any immediate danger.

Can a Cracked Wing Mirror Cause an MOT Failure?

This is arguably the most common question, and the answer, unfortunately, isn't always a straightforward 'yes' or 'no'. A cracked wing mirror can indeed lead to an MOT failure, but it heavily depends on the severity and location of the crack. The key factors considered include:

• Extent of Damage: A minor chip or a small hairline crack that doesn't significantly impair the driver's view or cause distortion might be an advisory rather than an outright fail. However, if the crack is large, obscures a significant portion of the reflective surface, or distorts the image, it's highly likely to result in a failure.
• Location of the Crack: Cracks that are within the 'critical field of vision' – the area essential for seeing traffic behind and to the side – are far more likely to cause a failure than those at the very edge of the mirror.
• Safety Hazard: If the crack results in sharp edges that could injure someone, or if the mirror glass is loose and likely to fall out, this immediately constitutes a safety hazard and will lead to an MOT fail.
• Image Distortion: Any crack that causes a significant distortion of the reflected image, making it difficult to accurately judge distances or speeds of following vehicles, will be deemed a failure.

Ultimately, the inspector's discretion plays a role, but their decision will always be based on whether the mirror provides a clear, uncompromised view and poses no safety risk.

Beyond Cracks: Other Mirror-Related MOT Failures

While cracks are a primary concern, several other issues with wing mirrors can also lead to an MOT failure:

• Missing Mirrors: All mandatory mirrors must be present. For cars first used on or after 1st August 1978, two mirrors are required: one on the offside (driver's side) and one interior mirror. If the interior mirror does not provide an adequate view (e.g., due to a camper conversion or large load), then an additional nearside (passenger side) mirror is required. Most modern cars have three mirrors as standard (offside, nearside, and interior), and all must be in good working order.
• Insecure or Loose Mirrors: If the mirror assembly is loose, vibrates excessively, or is likely to detach, it will fail the MOT. This affects both stability and the ability to maintain a clear view.
• Improper Adjustment: Mirrors must be adjustable and hold their position. If the manual adjustment mechanism is seized or the electric adjustment motor is faulty, preventing the driver from setting the mirror correctly, it's a fail.
• Obscured View: If the mirror surface is excessively dirty, scratched, or has stickers/obstructions that significantly obscure the view, it could fail.
• Broken or Malfunctioning Integrated Components: Many modern wing mirrors incorporate turn signal indicators, puddle lights, or even cameras for parking assistance or blind-spot monitoring. While the failure of a puddle light might not cause an MOT fail, a non-functioning integrated indicator lamp certainly will, as it's a mandatory light. Similarly, if a camera is essential for the vehicle's legal operation (e.g., as a primary rear-view device), its malfunction would be a fail.
• Incorrect Mirror Type: Mirrors must be of an approved type and size for the vehicle. Aftermarket mirrors that are too small, convex to an extreme degree, or unsuitable for the vehicle could be grounds for failure.

It's clear that the MOT test covers more than just the glass itself; the entire mirror assembly and its functionality are under scrutiny to ensure full compliance.

Addressing Cracked Wing Mirrors Before Your MOT

Given the strict MOT standards, it is always advisable to address any damage to your wing mirrors well in advance of your test date. Procrastination could lead to an MOT failure, incurring retest fees and the inconvenience of having to re-book.

Repair or Replace?

For minor chips or very small cracks that don't distort the view, it might be possible to get the mirror glass repaired by a specialist. However, for anything more significant, a full replacement of the mirror glass or even the entire mirror assembly is usually the safest and most reliable option.

• DIY Replacement: For older cars with simple, clip-on mirror glass, a DIY replacement might be feasible. Ensure you purchase the correct mirror glass for your specific make and model.
• Professional Replacement: Modern vehicles often feature complex wing mirror assemblies. These can include heating elements, electric adjustment motors, integrated LED indicators, blind-spot monitoring sensors, and even cameras. Replacing such an assembly correctly usually requires specialist tools and knowledge, making professional fitting highly recommended. Attempting a DIY repair on these complex units can lead to further damage or incorrect functionality.

Always source high-quality replacement parts, whether original equipment (OE) or reputable aftermarket alternatives, to ensure longevity and proper performance.

Crack Severity vs. MOT Outcome: A Quick Reference

To help you gauge the potential impact of a crack on your MOT, refer to this simplified guide:

Frequently Asked Questions About Wing Mirrors and MOT

How many mirrors does my car need to pass the MOT?

For cars first registered on or after 1st August 1978, you need two mirrors: an offside (driver's side) mirror and an interior mirror. If the interior mirror doesn't provide an adequate view to the rear (e.g., due to cargo or vehicle design), then a nearside (passenger's side) mirror is also required. Most modern cars come with offside, nearside, and interior mirrors as standard, and all three must be present and in good condition.

Can I use tape to fix a cracked mirror for the MOT?

No. Using tape or any adhesive to 'fix' a cracked mirror will not be acceptable for an MOT. The repair must be permanent, structurally sound, and provide a clear, undistorted view. Tape might secure the glass temporarily, but it won't resolve the crack itself and could obscure the view or be deemed a temporary repair, leading to a fail.

Do broken indicator lights in the mirror cause an MOT fail?

Yes, if your wing mirrors incorporate indicator lights, these are considered part of the vehicle's mandatory lighting system. If any integrated indicator lamp is not working, is cracked, or emits the wrong colour light, it will result in an MOT failure.

What if my wing mirror is just foggy or discoloured?

If the fogging or discolouration significantly obscures the driver's view to the rear or side, it could lead to an MOT failure. The mirror surface must provide a clear and accurate reflection. While minor fogging might pass, anything that impairs visibility will be flagged.

Is it illegal to drive with a cracked wing mirror before my MOT?

While a minor crack might not immediately stop you from driving, it is generally ill-advised. Regulation 18 of The Road Vehicles (Construction and Use) Regulations 1986 states that mirrors must "be maintained in such condition that the driver can at all times have a clear view to the rear and side of the vehicle." If the crack impairs your view or poses a safety risk (e.g., sharp edges), you could be stopped by the police and face a fine or points on your licence. It's always best to get it fixed promptly.

My wing mirror is electric and doesn't adjust. Will this fail the MOT?

Yes, if the mirror cannot be adjusted to provide the necessary view, whether manually or electrically, it will fail the MOT. The mechanism must be fully functional, allowing the driver to set the mirror to an appropriate position.

Conclusion: Prioritise Clarity and Compliance

In summary, while the MOT test has specific guidelines for wing mirrors, the overarching principle is always safety. A minor chip might escape a direct fail, but any damage that compromises your rear or side visibility, creates a safety hazard, or affects the mirror's stability and adjustment will almost certainly lead to an MOT failure. Don't wait until your MOT date to discover an issue. Regularly inspect your wing mirrors for damage, ensure they are clean and securely fitted, and address any problems promptly. Doing so not only significantly increases your chances of passing the MOT first time but, more importantly, ensures you maintain maximum awareness on the road, contributing to safer journeys for yourself and everyone else.

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