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Common MOT failures explained

What common DVSA wording means in normal English.

Integral body structure corroded

Serious corrosion in a structural part of the body. If rigidity is significantly reduced it is more than cosmetic rust and normally needs proper metal repair.

Corrosion within 30cm of a body mounting

Corrosion close to a structural mounting point can weaken the way the body or chassis carries loads and is treated seriously at MOT.

Brake disc worn, pitted or scored

The disc surface has deteriorated. An advisory can become a failure as wear or damage progresses; pads and discs should be inspected together.

Brakes imbalanced across an axle

The left and right brakes on the same axle are producing meaningfully different braking effort. Causes can include calipers, cylinders, contamination or adjustment.

Brake fluid warning lamp illuminated

A brake-system warning needs investigation rather than simply clearing the lamp. Check fluid level and the underlying brake system.

Exhaust lambda reading outside limits

The measured exhaust oxygen/emissions result is outside the permitted range. Causes can include air leaks, sensors, fuelling faults or catalyst problems.

Anti-roll bar linkage ball joint worn

Play has developed in an anti-roll-bar drop link joint. It can cause knocking and reduce suspension control.

Tyre cracking or perishing

Age, UV and deterioration can crack the rubber even when tread remains. The severity and location of damage determine whether replacement is required.

Fuel pipes corroded

Metal fuel lines have visible corrosion. Because deterioration can eventually cause a leak, the pipes need close inspection and repair where necessary.

Oil leak, but not excessive

Oil is escaping but was not severe enough at the test to meet the higher failure threshold. Find the source and monitor the fluid level.

Registration plate deteriorated

The plate is damaged or deteriorating but remains readable. Replace it before deterioration makes characters difficult to identify.

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