MOT defects: Non catalyst emissions

Noise, emissions and leaks

9 defects: 9 major. 2 can be given as an advisory instead.

Certificate wording	Severity	As an advisory	Inspection manual
Non catalyst emissions emissions likely to be affected by an exhaust leak	major	None	An induction or exhaust leak that could affect emissions levels
Non catalyst emissions emissions likely to be affected by an induction leak	major	None	An induction or exhaust leak that could affect emissions levels
Non catalyst emissions emissions carbon monoxide content excessive	major	None	Emissions levels exceed default limits
Non catalyst emissions emissions hydrocarbon content excessive	major	None	Emissions levels exceed default limits
Non catalyst emissions emissions - engine idle speed too high	major	None	The engine is idling at a speed clearly above its normal idling speed
Non catalyst emissions emits dense blue smoke at idle	major	None	emits dense blue or clearly visible black smoke for a continuous period of 5 seconds at idle
Non catalyst emissions emits visible black smoke at idle	major	None	emits dense blue or clearly visible black smoke for a continuous period of 5 seconds at idle
Non catalyst emissions emits clearly visible black smoke during acceleration	major	emits black smoke during acceleration	emits excessive dense blue or clearly visible black smoke during acceleration which would obscure the view of other road users
Non catalyst emissions emits excessive dense blue smoke during acceleration	major	emits blue smoke during acceleration	emits excessive dense blue or clearly visible black smoke during acceleration which would obscure the view of other road users

Pre-2018 names for this part

Non catalyst (8)

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