Questions on whether a 4-1-1 MOT will damage the effectiveness of the test with regards to emissions components are inevitable, especially when figures show that as many as one in five cars fail their first MOT, according to Klarius.
Many examples of replacement emissions system components come about due to physical damage, user error with fuel, knock-on problems from operating conditions, engine issues or incorrect servicing.
Klarius often introduces new replacement emissions products based on market demand, and there are some notable examples of issues arising with components before four years is up.
While manufacturer defects these days are uncommon, they are not unheard of.
Peugeot 207s manufactured in early 2008 featured an exhaust assembly that produced excessive noise, especially on 1.4 models.
The popular Nissan Juke compact SUV suffered from premature exhaust assembly fatigue within a similar timeframe.
In both instances, Klarius designed, tested and released to stock a VCA certified type-approved alternative.
Emissions components will also invariably degrade during vehicle use, which is dependent on miles covered, geographic location (by the sea) and the driving style of the user.
When an exhaust, CAT or DPF is showing signs of fatigue, choosing a quality replacement can solve the issue.
By extending the testing gap to four years, more of an onus is placed on motorists to ensure compliancy, which could result in vehicles of a reduced quality on our roads.
Public knowledge on emission components is not widespread, as issues with DPF and CAT removal illustrate.
From the experience of Klarius emissions technicians, relying on public knowledge over independent testing to ensure vehicle emissions quality and compliancy may not be the optimum approach.
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