Catalyst: pre-2018 MOT
This is pre-2018 MOT wording. The defect categories changed on 20 May 2018.
Partly now called Catalyst emissions. The rest has no direct match.
10 pre-2018 fail items.
| Old wording | Inspection manual | Now |
|---|---|---|
| Catalyst emissions carbon monoxide content at idle excessive | During the idle test, the level of carbon monoxide (CO) exceeds the vehicle specific or default limit continuously for the last 5 seconds of the 30 second countdown. | No direct match |
| Catalyst emissions carbon monoxide content after 2nd fast idle excessive | During the 2nd fast idle test the Carbon monoxide (CO) exceeds the vehicle specific or default limits continuously for the last 5 seconds of the 30 second countdown: | Catalyst emissions carbon monoxide content after 2nd fast idle exceeds default limits (major) |
| Catalyst emissions hydrocarbon content after 2nd fast idle excessive | During the 2nd fast idle test the Hydrocarbons (HC) exceeds the vehicle specific or default limits continuously for the last 5 seconds of the 30 second countdown | Catalyst emissions hydrocarbon content after 2nd fast idle exceeds default limits (major) |
| Catalyst emissions Lambda reading after 2nd fast idle outside specified limits | During the 2nd fast idle test the Lambda (l) exceeds the vehicle specific limits continuously for the last 5 seconds of the 30 second countdown | Catalyst emissions Lambda reading after 2nd fast idle outside specified limits (major) |
| Catalyst engine idle speed too high | The engine idle speed is clearly above the vehicle specific limit. | Catalyst emissions emissions - engine idle speed too high (major) |
| Catalyst emits dense blue smoke at idle | emits dense blue or clearly visible black smoke for a continuous period of 5 seconds at idle | Catalyst emissions emits dense blue smoke at idle (major) |
| Catalyst emits visible black smoke at idle | emits dense blue or clearly visible black smoke for a continuous period of 5 seconds at idle | Catalyst emissions emits visible black smoke at idle (major) |
| Catalyst emits clearly visible black smoke during acceleration | emits excessive dense blue or clearly visible black smoke during acceleration which would obscure the view of other road users | Catalyst emissions emits clearly visible black smoke during acceleration (major) |
| Catalyst emits excessive dense blue smoke during acceleration | emits excessive dense blue or clearly visible black smoke during acceleration which would obscure the view of other road users | Catalyst emissions emits excessive dense blue smoke during acceleration (major) |
| Catalyst tailpipe not capable of allowing the emission probe to be inserted | the emissions cannot be measured because a tailpipe accessory is fitted which prevents insertion of the analyser probe | Catalyst emissions emissions likely to be affected by an exhaust leak (major) |
Current names are the closest match by wording and part. The DVSA publishes no official old-to-new table.
Other pre-2018 parts in Exhaust, Fuel and Emissions
Dabers ANPR shows the full MOT history, defects included, for the car in any photo. How it works
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