155 S450 Operation & Maintenance Manual
ENGINE AIR CLEANER (CONT’D)
Replacing Filters (Cont’d)
Inner Filter
Replace the inner filter only under the following
conditions:
• Replace the inner filter every second time the outer
filter is replaced.
• After the outer filter has been replaced, start the
engine and operate at full rpm. If service code
[M0117] (Air Filter Plugged) is still displayed in the
data display, replace the inner filter.
Stop the engine, open the rear door, and remove the rear
grille. (See REAR GRILLE on Page 150.)
Remove the cover [Figure 206] and the outer filter
[Figure 207].
Figure 208
Remove the inner filter (Item 1) [Figure 208].
NOTE: Make sure the filter housing is free of dirt and
debris. Verify that sealing surfaces are clean.
DO NOT use compressed air.
Install new inner filter. Push in until the filter contacts the
base of the housing.
Install the outer filter [Figure 207].
Figure 209
Install the cover (Item 2) and secure three latches (Item
1) [Figure 209]. (One latch is not visible in the photo.)
Install the rear grille and close the rear door.
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