MOT Preparation: Common Failures and Pre-Test Checks

Lighting failures top the MOT rejection charts year after year, accounting for roughly one-third of all MOT failures nationwide. It's surprisingly easy to miss a blown bulb, particularly rear ones that only illuminate when you're reversing or indicating. Take a few minutes to check every single light on your vehicle, including headlights, brake lights, indicators, hazard lights, and number plate illumination. Don't forget that fog lights, if fitted, must also be in working order.

Tyre troubles come a close second in the failure stakes. The legal tread depth minimum of 1.6mm might sound generous, but worn tyres are dangerous and easily spotted by trained eyes. Check across the entire width of each tyre, paying particular attention to the edges where wear patterns often begin. MOT testers examine tyres for cuts exceeding 25mm, bulges, exposed cord, and incorrect tyre sizes. Mixing different tyre types on the same axle will also result in failure.

Brakes represent another common stumbling block, though thankfully one that's harder to miss during normal driving. If your car pulls to one side under braking, makes unusual noises, or the pedal feels spongy, book a garage inspection well before your MOT date. Testers will fail vehicles with significantly or obviously worn brake discs, alongside issues with brake pedal effectiveness, handbrake operation, and visible brake fluid leaks.

Windscreen damage catches many drivers unawares. That small chip you've been ignoring might seem insignificant, but if it's larger than a 10p coin and sits within the driver's direct line of vision, or if damage exceeding 40mm appears anywhere within the swept area, it constitutes an automatic failure. Similarly, ensure your wipers clear the screen effectively without leaving streaks or missing patches.

Fluid levels deserve attention too. Top up your windscreen washer reservoir with proper screenwash rather than fairy liquid, check your engine oil level, and ensure your brake fluid hasn't dropped below the minimum marker.

Exhaust emissions represent an increasingly stringent area of testing. Diesel vehicles face particular scrutiny regarding smoke opacity, whilst petrol engines undergo lambda sensor and catalytic converter efficiency tests. Warning lights on the dashboard, particularly those relating to engine management, ABS, or airbag systems, will result in immediate failure.

Suspension components receive thorough examination including shock absorbers, springs, bushes, and anti-roll bar connections. Many vehicles fail due to worn suspension bushes that drivers haven't noticed during normal operation.

Don't overlook the basics either. Your horn should work with a firm press of the centre of the steering wheel, seatbelts must click securely into place and retract smoothly, and mirrors should be crack-free and properly adjusted.

A little preparation goes a long way towards MOT success. Many local garages offer pre-MOT checks that can identify potential failures before the official test. A comprehensive pre-MOT inspection typically costs between £20-£40 but can save considerably more if it identifies issues that would otherwise cause test failure. Most garages will deduct the inspection fee from any subsequent repair work, making it a cost-effective investment.

Remember, your MOT certificate is valid for exactly 12 months from the test date, so booking early means you won't lose any remaining time on your current certificate. With these simple checks completed, you can approach your MOT appointment with confidence, knowing you've done everything possible to keep your car legally on Westbourne's roads for another year.