I have just opened a topic withvthe same question for a 96 Paseo. There's a link to a diagram there that can be helpful (ir you may look for the same Starlet diagram in that website). I have also passed it to my mechanic and I am waiting for his response. Anyway, it looks like some panels have to be removed to accesds the filter, if there is any. Will let you know if I made any progress.