Exhaust system

Test Description

The exhaust system will fail the MOT if:

• Part of the system missing or excessively deteriorated
• A mounting is missing or damaged so it does not support the system
• There is a major leak
• The system is excessively noisy.

Emissions

These are checked using specialised equipment, the details of the check depending on the year that the vehicle was first used on the road. Excessive smoking (checked visually) is a reason for failure.

Diesel smoke emissions are checked by using a smoke meter

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