New MOT test has a sting in the tailpipe for diesel drivers

A tougher and updated MoT test comes into force today – and drivers are being warned not to get caught out.

There are tighter emissions limits on diesel cars and new fail categories state when a vehicle should not be driven.

Changes to how defects are categorised – minor, major or dangerous – are designed to make it simpler for motorists to know if their vehicle is safe to drive.

Faults that are deemed dangerous or major will result in the MoT being failed. A minor issue should be repaired as soon as possible. There will be stricter limits for emissions from diesel cars with a diesel particulate filter (DPF), which captures soot. Vehicles will get a major fault if the MoT tester can see smoke coming from the exhaust or if the DPF has been tampered with.

The rules could lead to expensive bills – new DPFs often cost more than £1,000. There will also be new checks on under-inflated tyres and fluid leaks that could pose an environmental risk.

Motoring groups fear many drivers are unaware of the new test. Green Flag found 58 per cent of drivers surveyed did not know the changes come into effect today.