Porsche Cayenne Owner's Manual page 224

Water crossing
f Pay attention to the ground clearance of the
car.
Please observe the chapter "GROUND CLEA-
RANCE" on Page 393.
224
Driving and Driving Safety
Danger!
Danger of drowning if water enters the
vehicle. Risk of damage to the engine and
accessories if water penetrates.
f Before driving through water, check the water
depth A, water speed and the condition of the
surface beneath it.
The water must not be deeper than 22 in.
(55.5 cm).
f Check the door sills and rubber seals before
starting to drive.
f Do not drive through deep or rapidly flowing
water.
Deep or rapidly flowing water, e.g. mountain
streams, can cause the car to deviate from the
desired path.
f Avoid a "bow wave" by driving at an appropri-
ate speed.
f Never open the doors when driving through
water.
Soiling can impair the braking action.
f Check and clean the brakes if they have been
soiled.
Danger of steering assistance failing during
a long trip in the water if the drive belt slips.
f If the steering assistance fails, more effort will
be required to steer.
Danger of damaging electrical systems
f Avoid driving through salt water.
Notes on operation
f Activate the Low Range program.
f Switch the air conditioner off.
f Switch the headlights off.