
Volkswagen has a particulate filter. Function of the particulate filter: The particulate filter can reduce soot produced by diesel engines by more than 90%, and the captured particulate emissions are subsequently burned off during vehicle operation. Application technology of the particulate filter: The particulate filter utilizes advanced electronic control systems, catalytic coatings, and fuel-additive catalysts. Principle of the particulate filter: The diesel particulate filter is coated with metals such as platinum, rhodium, and palladium. The black smoke containing carbon particles emitted by the diesel engine enters the exhaust particulate trap through a dedicated pipe. After passing through the densely arranged bag-type filters inside, the carbon particles are adsorbed onto the filter made of metal fiber felt. When the adsorption of particles reaches a certain level, the burner at the end automatically ignites and burns, turning the adsorbed carbon particles into harmless carbon dioxide that is then released.

Last time I took my Volkswagen Tayron for maintenance, the technician mentioned it's equipped with a particulate filter. This device specifically traps soot particles in the exhaust, and now most Volkswagen models meeting China VI standards have it installed. But I must remind you, if you frequently drive short distances, the emission warning light might illuminate on the dashboard—that indicates clogged particulates. When I encountered this last time, the technician advised me to drive in Sport mode for half an hour on the highway to burn off the carbon deposits using the high exhaust temperatures. Now the car's condition has improved significantly, and fuel consumption has returned to normal levels.

As someone who frequently deals with exhaust emission testing, I've noticed that Volkswagen models starting from the 2020 version are mostly equipped with GPF (Gasoline Particulate Filters). Popular models like the Tiguan L and Passat show significantly better exhaust emission test values. However, it's important to pay attention to fuel quality. A colleague's Sagitar had its GPF clogged prematurely due to poor-quality fuel, costing over 3,000 yuan in repairs. It's recommended to use gasoline with an octane rating of 95 or above and take a highway drive once a month to prevent clogging, otherwise, it could affect engine performance and damage the catalytic converter.

Remember helping my dad deal with his Touareg GPF warning: first the start-stop function failed, then fuel consumption soared to 15L. The repair manual states this device is like an air purifier, collecting PM2.5 particles. The mechanic removed the exhaust pipe and used a high-temperature torch to burn it for half an hour to clear it. Now I remind him not to always take short trips under 3 kilometers - Volkswagen's system requires speeds above 70km/h for self-cleaning, something city commuter cars need to pay special attention to.


