Many retrofitted diesel particulate filters fail German tests

With German cities on the verge of banning older diesel vehicles from central areas at the beginning of the year, many drivers are getting particulate filters installed on their cars. The German government offers subsidies of up to €330 for the installations. In order to qualify for the rebates, the filters must be able to remove at least thirty percent of particulates from the exhaust stream. Drivers of older, more polluting cars also have to pay higher road taxes.
Therein lies the rub. German testing organization TÜV Hessen has been testing aftermarket particulate filters and the results aren't good. Some of the filters made by Bosal, Tenneco and GAT removed only from zero to ten percent of soot. The filters are now being re-tested, but in the meantime installers are at a stand still. The manufacturers have already pulled some of the disputed units off the market. It's expected that the market for aftermarket particulate filters in Germany could hit 1.5 million units in the next two years.

[Source: Automotive News - Sub. req'd]

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