Removal of diesel particulate filters - MOT failures

Meeting: 
MQT on 2017-01-18
Session date: 
January 18, 2017
Reference: 
2017/0071
Question By: 
Caroline Russell
Organisation: 
City Hall Greens
Asked Of: 
The Mayor
Category: 

Question

What proportion of car MOT failures for diesel particulate filter (DPF) removal are in the London region, and what steps are Transport for London (TfL) taking to coordinate action on this with Government agencies?

Answer

Answer for Removal of diesel particulate filters - MOT failures

Answer for Removal of diesel particulate filters - MOT failures

Answered By: 
The Mayor

MOT failures for diesel particulate filter (DPF) removal will be recorded as an overall failure of the emissions test, if the smoke limit is exceeded. As this can be for reasons other than the removal of the DPF, the proportion of failures in the London area attributed to DPF removal is not known.

Transport for London (TfL) has been working with the Department for Transport (DfT) and the Driver and Vehicle Standards Agency to support them in addressing the nationwide issue of DPF removal. For example, TfL has undertaken some equipment testing on behalf of DfT and on the Dial-a-Ride fleet to see if DPF removal can be more easily detected during an MOT test. While initial results were inconclusive, TfL continues to work with DfT to identify suitable solutions.