Hello My skoda start keeping rpm in neutral around 900 to 950, yesterday i went for ride on motorway and engine light came on then few minutes after dpf light came on. Drove for 2 hours no issuses turbo works fine also power is fine, traffic was cray so was not able keep driving in high rpm. Will only driving in high RPM help to clear out or not? Should i use dpf additive? also it is 182k miles... Today i started the car in the morning and rpm was at normal.also dpf light is gone but engine light is still on. Then after short drive went to neutral and rpm back to 900-950 should i be worried? thanks