Ford F-150 2018 Owner's Manual page 203

Filter Service and Maintenance
Over time, a slight amount of ash builds
up in the diesel particulate filter, which is
not removed during the regeneration
process. The filter may need to be removed
for ash cleaning at approximately
120,000 mi (190,000 km) or it may need
to be replaced with a new or
remanufactured part. Actual mileage
varies depending on engine and vehicle
operating conditions. The filter may need
to be replaced with a new or
remanufactured part at approximately
250,000 mi (400,000 km). Actual
mileage varies depending on engine and
vehicle operating conditions.
If filter service is required, the
engine control system warning
lamp illuminates in the
information display.
If there are any issues with the
diesel particulate filter system,
the engine control system
warning lamp and a service
engine soon warning lamp
illuminate to inform you that
your vehicle requires service. Have your
vehicle checked as soon as possible.
Resonator and Tailpipe Assembly
Maintenance
Aftermarket devices or modifications to
the exhaust system may reduce the
effectiveness of the exhaust system as
well as cause damage to the exhaust
system or engine. This may also degrade
vehicle performance and could lead to
engine damage that may not be covered
by the vehicle Warranty.
F-150 (TFC) Canada/United States of America, enUSA, Edition date: 201705, First Printing
Engine Emission Control
200