A concept for an electrochemical reactor acting as a trap for the removal of soot particles from diesel exhaust gas has been developed and presented earlier .Only small scale flat plate samples tested with synthetic exhaust gas was presented. Since then, the sample size has been increased, and test on a diesel engine in a test bench has been carried out. Various concepts for the establishment of a sufficient filtering surface and for the electrical connections have been tested, and the construction of a muffler with an electrochemical reactor installed has been initiated. This is to be on a passenger car for on-road test.The preliminary bench test indicates a soot removal efficiency of 75-90% with no accumulation of soot at the reactor, at temperatures above 250°C.A separate project has been started to evaluate the possibilities of lean NOx removal on a similar reactor. Results from this will be reported separately.