In fact the diesel smoke test was implemented before DPF’s were even applied to cars. It is worth remembering that DPF’s were not designed to help cars pass the MOT smoke test, they are a result of recent European legislation and the continued pressure on car manufacturers to clean up their emissions. So why does a car not fail the smoke test if the DPF is removed? Removing the DPF will not cause the opacity level to rise high enough to fail, in fact, it is very difficult to get a diesel vehicle to fail an MOT smoke test, the fail mark is very high. How will removing a DPF affect the smoke test?Ī DPF is designed to filter out soot from diesel exhaust gasses, therefore a DPF will reduce the opacity of the smoke. During the diesel smoke test the opacity of the smoke is tested, the exhaust gasses are NOT measured or recorded. Carbon Monoxide (CO), Hydrocarbons (HC) and Lambda (~).ĭiesel vehicles are NOT subject to an emission test, instead they are subject to a simple Metered Smoke Test.
Petrol vehicles are subject to an emissions test, during this test the exhaust gasses and lambda readings are measured and recorded. These are the sort of questions we are asked on a daily basis and therefore we have compiled some information on this page relating to current and expected MOT regulations to try and shed some light on this often miss informed subject. Will my car fail MOT if I remove the DPF?
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