Originally posted by bkpr
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Similar to a DPF = Diesel Particulate Filter
Both meant to capture small particles in the exhaust gases and then burn them rather than blow them out into the atmosphere. PPFs are now mandatory for cars in Europe, I'm not sure what will happen for Oz and US market VWs.
You'd hope the PPF would be better engineered than some DPFs ( which simply didn't work for cars always driven on short trips ), but you can never be sure with VW

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