2005 PORSCHE CAYENNE TURBO catalytic converter

5
Environmentally friendly vehiclesModern environmental technology ensures compli-
ance with all emission laws applicable worldwide.
It has the following advantages:
– Rapid “operational readiness” of the catalytic
converters ensures low emissions, even in
short-trip operation.
– Reliable operation and good emission control
over a long useful life.
fPlease observe the chapter “FUEL ECONOMY”
on Page 249.
Recycling –
for a Porsche, this is virtually an
academic questionMore than two-thirds of all Porsches ever built are
still running.
But, just in case recycling is ever necessary,
we take the following precautionary
measures:
– Utilisation-friendly design.
– Identification of materials.
– Use of recyclable materials.
– Reusable components designed for simple
removal.
Emission control is built inInnovative engine technology combines high
engine performance and environmental compati-
bility.
The engine diagnosis system electronically
monitors the components and systems that affect
exhaust gases.
This continuous monitoring and fault storage
enables swift, reliable diagnosis and fault detec-
tion.
Faults are indicated to the driver by the “Emission
control” warning light and display.
fPlease observe the chapter “EMISSION CONT-
ROL” on Page 76.

250
Maintenance, Car Care
Fuel
Warning!
Fuel is highly flammable and harmful to
health.
fFire, open flame and smoking are prohibited
when handling fuel.
fAvoid contact with skin or clothing.
fDo not inhale fuel vapours.
To prevent damage to the emission control
system and engine:
fNever drive the tank completely out of fuel.
fAvoid high cornering speeds after the warning lights have come on.
fPlease observe the chapter “HOW EMISSION
CONTROL WORKS” on Page 255.
fPlease observe the chapter “LEVEL GAUGE”
on Page 74.
To avoid permanent damage to the functionality of
the catalytic converters and oxygen sensors, use
only unleaded fuel.
The engine is designed to provide optimum
performance and fuel consumption if unleaded
premium fuel with 98 RON/88 MON is used.
If unleaded premium fuels with octane numbers of
at least 95 RON/85 MON are used, the en-
gine's knock control automatically adapts the igni-
tion timing.
Filler flapThe filler flap is located in the rear right wing and
is electrically opened with pull-button A in the driv-
er's door.
The pull-button is also ready for operation when
the ignition is switched off.
Fuel quality labelOpening
fOperate pull-button A in the driver's door.
The filler flap pops open.
Closing
fClose the filler flap until it clicks shut.

252
Maintenance, Car Care
Fuel RecommendationsYour Porsche is equipped with catalytic convert-
ers and must use UNLEADED FUEL ONLY.
Your engine is designed to provide optimum per-
formance and fuel economy using unleaded premi-
um fuel with an octane rating of 98 RON
(93 CLC or AKI). Porsche therefore recom-
mends the use of these fuels in your vehicle.
Porsche also recognizes that these fuels may not
always be available. Be assured that your vehicle
will operate properly on unleaded premium fuels
with octane numbers of at least 95 RON
(90 CLC or AKI), since the engine's “Electronic
Oktane™ knock control“ will adapt the ignition tim-
ing, if necessary.
T h e u s e o f U N L E A D E D F U E L O N LY i s c r i t i c a l l y
important to the life of the catalytic convert-
ers. Deposits from leaded fuels will ruin the
converters and make it ineffective as an
emission control device.
Cars with catalytic converters have a smaller fuel
tank opening, and gas station pumps have smaller
nozzles. This will prevent accidental pumping of
leaded fuel into cars with catalytic converters.
Unleaded fuels may not be available outside the
continental U.S. and Canada. Therefore, we rec-
ommend you do not take your car to areas or
countries where unleaded fuel may not be avail-
able.
Octane ratingsOctane rating indicates a fuel's ability to resist det-
onation. Therefore, buying the correct octane gas
is important to prevent engine “damage“.
The RON octane rating is based on the research
method. The CLC (U.S. Cost of Living Council oc-
tane rating) or AKI (antiknockindex) octane rating
usually displayed on U.S. fuel pumps is calculated
as research octane number plus motor octane
number, divided by 2, that is written as:
The CLC or AKI octane rating is usually lower than
the RON rating:
For example: 95 RON equals 90 CLC or AKI
Fuels containing alcohol and etherSome areas of the U.S. require oxygenated fuels
during certain portions of the year. Oxygenated fu-
els are fuels which contain alcohols (such as meth-
anol or ethanol) or ether (such as MTBE).
Under normal conditions, the amount of these
compounds in the fuel will not affect driveability.
You may use oxygenated fuels in your Porsche,
provided the octane requirements for your vehicle
are met. We recommend, however, to change to a
different fuel or station if any of the following prob-
lems occur with your vehicle:
– Deterioration of driveability and performance.
– Substantially reduced fuel economy.
– Vapor lock and non-start problems, especially
at high altitude or at high temperature.
– Engine malfunction or stalling.
RON MON+
2 ----------------------------------
orRM+
2 ---------------

254
Maintenance, Car Care
Emission Control SystemIn the interest of clean airPollution of our environment has become a prob-
lem that is of increasing concern to all of us. We
urge you to join us in our efforts for cleaner air in
controlling the pollutants emitted from the auto-
mobile.
Porsche has developed an emission control sys-
tem that controls or reduces those parts of the
emission that can be harmful to our environment.
Your Porsche is equipped with such a system.
Porsche warrants the Emission Control System in
your new car under the terms and conditions set
forth in the Warranty Booklet.
You, as the owner of the vehicle, have the respon-
sibility to provide regular maintenance service for
the vehicle and to keep a record of all mainte-
nance work performed. To facilitate record keep-
ing, have the service performed by authorized
Porsche dealers. They have Porsche trained tech-
nicians and special tools to provide fast and effi-
cient service.To assure efficient operation of the Emission
Control System:
fHave your vehicle maintained properly and in
accordance with the recommendations de-
scribed in your Maintenance Booklet. Lack of
proper maintenance, as well as improper use
of the vehicle, will impair the function of the
emission control system and could lead to
damage.
fDo not alter or remove any component of the
emission control system.
fDo not alter or remove any device, such as
heat shields, switches, ignition wires, valves,
etc., which are designed to protect your vehi-
cle's emission control system. In addition to
serious engine damage, this can result in a fire
if excess raw fuel reaches the exhaust system.
fDo not continue to operate your vehicle if you
detect engine misfire or other unusual operat-
ing conditions.
Parking
Warning!
Danger of fire.
fDo not park or operate the vehicle in areas
where the hot exhaust system may come in
contact with dry grass, brush, fuel spill or oth-
er flammable material.
fIf your car catches on fire for any reason, call
the fire department. Do not endanger your life by attempting to put out the fire.
Undercoating
Danger!
Danger of fire and serious personal injuries
or death.
fDo not apply additional undercoating or rust-
proofing on or near the exhaust manifold, ex-
haust pipes, catalytic converters or heat
shields. During driving the substance used for undercoating could overheat and ignite.

Maintenance, Car Care
255
How Emission Control WorksWhen an automobile engine is running, it uses en-
ergy generated through the combustion of a mix-
ture of air and fuel. Depending on whether a car is
driven fast or slowly or whether the engine is cold
or hot, some of the fuel (hydrocarbons) may not
be burned completely, but may be discharged into
the engine crankcase or exhaust system. Additon-
al hydrocarbons may enter the atmosphere
through evaporation of fuel from the fuel tank.
These hydrocarbons (HC), when released into the
air, contribute to undesirable pollution.
In addition, carbon monoxide (CO) and oxides of
nitrogen (NOx) contribute to engine emissions.
They, too, are formed during the combustion pro-
cess and discharged into the exhaust system.
To reduce these pollutants, your Porsche is
equipped with a precisely calibrated fuel injection
system to assure a finely balanced air/fuel mixture
under all operating conditions.
Oxygen sensorThe oxygen sensor, installed in the exhaust pipe
continuously senses the oxygen content of the ex-
haust and signals the information to an electronic
control unit. The control unit corrects the air/fuel
ratio, so the engine always receives an accurately
metered air/fuel mixture.Crankcase ventilationThrough crankcase ventilation, undesirable emis-
sions from the engine crankcase are not permit-
ted to reach the outside atmosphere. These emis-
sions are recirculated from the crankcase to the
air intake system. From here the emissions mix
with the intake air and are later burned in the en-
gine.Catalytic convertersThe catalytic converters are efficient “clean-up“
devices built into the exhaust system of the vehi-
cle. The catalytic converters burn the undesirable
pollutants in the exhaust gas before it is released
into the atmosphere.
The exclusive use of unleaded fuel is critical-
ly important for the life of the catalytic con-
verters. Therefore, only unleaded fuel must
be used.The catalytic converters will be damaged by:
– push or tow starting the vehicle
– misfiring of the engine
– turning off the ignition while the vehicle is mov-
ing or
– driving until the fuel tank is completely empty
– by other unusual operating conditions.
fDo not continue to operate your vehicle under
these conditions, since raw fuel might reach
the catalytic converters. This could result in
overheating of the converters. Federal law pro-
hibits use of leaded fuel in this car.

Maintenance, Car Care
261
UndercoatingThe underside of your car is durably protected
against chemical and mechanical influences.
As it is not possible to exclude the risk of damage
to this protective coating in day to day driving, it
is advisable to have the underside of the car in-
spected at certain intervals - preferably before the
start of winter and again in spring - and the under-
coating restored as necessary.
Your authorized Porsche dealer is familiar with the
bodyseal treatment procedures and has the nec-
essary equipment for applying factory approved
materials. We recommend that you entrust them
with such work and inspections.
Unlike conventional spray oils, undercoating and
rust-proofing compounds based on bitumen or
wax do not attack the sound-proofing materials ap-
plied at the factory.
Danger!
Danger of fire and serious personal injuries.
fDo not apply additional undercoating or rust-
proofing on or near the exhaust manifold, ex-
haust pipes, catalytic converters or heat
shields. During driving the substance used for undercoating could overheat and ignite.
fBefore applying fresh underseal, carefully re-
move deposits or dirt and grease. Once it has
dried, the new undercoating compound forms
a tough protective coating which provides effi-
cient rust-proofing of the floor panels and com-
ponents.
fAlways apply a fresh coating of suitable preser-
vative to unprotected areas after cleaning the
underside of the body, the transmission, the
engine or carrying out repairs to under-body,
engine or transmission components.
Effective rust-proofing is particularly important
during the cold weather season. If your car is driv-
en frequently in areas where salt has been spread
on the roads, the whole engine compartment
should be cleaned thoroughly after the winter to
prevent salt from causing any lasting damage. A
full under-body wash should also be performed at
the same time.

Practical Tips, Minor Repairs
323
Emergency Starting with Jumper
CablesIf the battery is discharged, e.g. in winter or after
the car has been parked for a long time, the bat-
tery of another car can be used for starting with
the help of jumper cables.
Make sure the voltage of both batteries is the
same.
The capacity (Ampere hours, Ah) of the booster
battery must not be substantially less than that of
the discharged battery.The discharged battery
must be correctly connected to the vehicle's elec-
trical system.
fPlease observe the chapter “BATTERY” on
Page 312.
Note
Do not try to start the car by pushing or towing.
Damage to the catalytic converters and other
components of the car may result.
Danger!
Risk of damage and serious personal injury
due to short circuit.
fUse only jumper cables of adequate diameter
cross-section and fitted with completely insu-
lated alligator clips.
fFollow all warnings and instructions of the
jumper cable manufacturer.
fWhen connecting jumper cables, make sure
that they cannot get caught in any moving
parts in the engine compartment.
The jumper cables must be long enough so
that neither vehicles nor cables touch another.
fThe vehicles must not be in contact, otherwise
current might flow as soon as the positive ter-
minals are connected.
fThe cable clamps must not be allowed to con-
tact each other when one end of the jumper ca-
bles are connected to a battery.
fCarefully ensure that tools or conductive jewel-
ery (rings, chains, watch straps) do not come
into contact with the positive jumper cable or
the positive battery post.
fImproper hook-up of jumper cables can ruin
the alternator.
Risk of caustic burns from escaping acid.
fDo not lean over the battery.Danger of gas explosion.
fImproper use of booster battery to start a ve-
hicle may cause an explosion, resulting in se-
vere personal injuries.
fKeep sources of ignition away from the bat-
tery, e.g. open flame, burning cigarettes or
sparking due to cable contact or welding work.
fA discharged battery can freeze even at
14°F/10°C. Before connecting jumper ca-
bles, a frozen battery must be thawed out.

Index
359
Brake wear
Warning light ........................................ 66
Brake-fluid level
Checking ............................................ 242
Brakes ................................................ 62
,219
Fluid.......................................... 242,351
Fluid warning light ...................... 110,243
Pads ............................................. 14,67
Test stand .......................................... 219
Warning light ........................................ 63
Wear .................................................. 110
Bulbs
Changing............................................ 336
Chart ................................................. 327
CCapacities .................................................. 351
Car care..................................................... 256
Car Telephone ............................................ 169
Care ............................... 260
,262
,263
,264
Cargo area ................................................. 182
Carpet ....................................................... 263
Catalytic converter...................................... 255
Center differential lock ................................ 208
Central locking system ......................... 21,302
Button .................................................. 22
Button (rear) ......................................... 31
Central vents ..................................... 129,135
Changing wheels................................ 286,293
Check engine ............................................... 76
Checking hydraulic fluid (power steering) ...... 244
Child restraint anchorages ............................. 46
Child restraint systems .................................. 47Child seat .....................................................48
Attachment ...........................................48
Childproof locks
Rear doors ...........................................26
Cigarette lighter ..........................................166
Circulating-air mode ...........................129
,134
Circulating-air mode, automatic ...........129,134
Cleaner
Air......................................................245
Particle...............................................245
Clock ...........................................................99
Collapsible spare wheel ...................... 90
,216
,
...............................................294
,319
,349
Warning light.......................................108
Comfort function
Sliding/lifting roof.......................148,153
Comfort lighting ..........................................146
Coming Home function .......................104,146
Compass....................................................100
Compressor ......................................285,296
Coolant
Checking ............................................240
Cooling system .............................................73
Engine coolant level warning ..................73
Temperature gauge...............................73
Warning ................................................73
Cornering light ............................................115
Crankcase ventilation ..................................255
Crossing obstacles .....................................226
Cruise control
Accelerating .......................................123
Decelerating .......................................123
Interrupting .........................................123
Speed limit .........................................122Storing speed .................................... 122
Switching off ...................................... 124
Switching on ...................................... 122
Cupholder......................................... 172
,176
Closing rear ....................................... 177
Opening front ..................................... 176
opening rear ...................................... 177
Removing insert front ......................... 176
DData bank .................................................. 344
Diagnostic Socket ........................................ 15
Dimensions ................................................ 354
Dimming .................................................... 146
Button ............................................... 144
Door lock
Deicing .............................................. 258
Door locking, automatic ....................... 23
,102
Door mirrors .............................. 55
,146
,194
Automatic anti-dazzle operation ............. 57
Driving with a trailer ............................ 194
Extending ............................................ 56
Folding in ............................................. 56
Heating................................................ 56
Setting ................................................ 56
Swivelling, automatic ............................ 56
Door opening ................................ 19
,20,21,
........................................... 23
,24,26,102
Emergency operation ........................... 18
Door trim panel .......................................... 172
Lighting ............................................. 146
Doors.......................................................... 26
Door-surrounding lighting ............................ 146