This function is used to perform a regeneration. The function cleans the particle filter from particles by burning them off. In certain driving conditions, the particle filter can not be cleaned automatically, e.g., in continuous city driving. Then it may be necessary to perform a regeneration to avoid clogging of the particle filter.
When the regeneration is performed, the throttle angle should be hold as constant as possible. Perform the test when the car is driven at a constant speed between 50 - 100 km/h (31 - 62 mph) in 3rd gear for 15 minutes.