Cadillac cts User Manual

The engine air cleaner/filter is in the engine
compartment on the driver’s side of the vehicle, near the
front. See “Engine Compartment Overview” in the
Index for more information on location.

The engine air cleaner/filter needs replacement
periodically. Use the information listed in this manual 
as a guide for filter replacement intervals. 
See “Maintenance Schedule” in the Index for more
information. In general, you should change the filter
whenever the indicator located on the cover turns 
black. See the previous photo for the exact location 
of the indicator.

The indicator may turn black earlier or later than the
suggested replacement intervals listed under
“Maintenance Schedule” in this manual. However, you
should replace the filter and reset the indicator once the
indicator turns black.

To check or replace the filter, do the following:

1. Remove the two screws located on the sides 

of the cover.

2. Lift the cover off.