The pre-filter is to the left of the main filter as you face the engine. Opposite side of the housing.
What "mis-fire" code did you get and what scanner are you using?
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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