2014 Seat Leon SC check engine

Air conditioning
WARNING
Reduced visibility through the windows in-
creases the risk of serious accidents.
● Always ensure that all windows are free of
ice and snow, and that they are not fogged,
so as to maintain good visibility of everything
outside.
● The maximum heat output required to de-
frost windows as quickly as possible is only
available when the engine has reached its
normal running temperature. Only drive when
you have good visibility.
● Always ensure that you use the heating
system, fresh air system, air conditioner and
the heated rear window to maintain good visi-
bility to the outside.
● Never leave the air recirculation on for a
long period of time. If the cooling system is
switched off and air recirculation mode
switched on, the windows can mist over very
quickly, considerably limiting visibility.
● Switch air recirculation mode off when it is
not required. WARNING
Stuffy or used air will increase fatigue and re-
duce driver concentration possibly resulting
in a serious accident.
● Never leave the fresh air fan turned off or
use the air recirculation for long periods of
time; the air in the vehicle interior will not be
refreshed. CAUTION
● Switch the air conditioner off if you think it
may be broken. This will avoid additional
damage. Have the air conditioner checked by
a specialised workshop.
● Repairs to the air conditioner require spe-
cialist knowledge and special tools. SEAT rec-
ommends visiting a SEAT Official Service. Note
● When the cooling system is turned off, air
coming from the outside will not be dried. To
prevent fogging of the windows, SEAT recom-
mends leaving the cooling system (compres-
sor) turned on. To do this, press the button  . The button lamp should light up.
● The maximum heat output required to de-
frost windows as quickly as possible is only
available when the engine has reached its
normal running temperature.
● Keep the air intake slots in front of the
windscreen free of snow, ice and leaves to en-
sure heating and cooling are not impaired,
and to prevent the windows from misting
over. Adjust using the Easy Connect
system*
3 Applies to vehicles with a Touch/Colour Media
S
y
stem.
In the Easy Connect system it is also possible
to perform various adjustments to the Clima-
tronic.
Open the air conditioner menu ● Pre

ss the Setup button.
● OR: press the MENU button in Easy Con-
nect. With the rotating switch select the air
conditioner menu and open it.
On the touch screen you can see and change
the current settings, for example, the temper-
ature set for the driver and passenger sides,
the air distribution and the fan speed. With
button  the driver and passenger side
temperatures are synchronised ›››
Book-
let Media System Touch/Colour, chapter Air
conditioning .
T o sw

itch a function on or off, or to select a
submenu, you must press the corresponding
function button.
For more information about functions
››› page 81
.
»
125
Technical specifications
Advice
Operation
Safety
The essentials

Air conditioning
● The air conditioner compressor has been
temporarily switched off because the engine
coolant temperature is too high.
● Another fault in the vehicle. Have the air
conditioner checked by a specialised work-
shop. Special Characteristics
If the humidity and temperature outside the
vehicle are high,
condensation
can drip off
the ev
aporator in the cooling system and
form a pool underneath the vehicle. This is
normal and does not indicate a leak! Note
After starting the engine, any residual humid-
ity in the air conditioner could mist over the
windscreen. Switch on the defrost function as
soon as possible to clear the windscreen of
condensation. Air vents
Fig. 140
On the dash panel: air vents Air vents
To ensure proper heating, cooling and venti-
lation in the vehicle interior, air vents
››› Fig. 140 1 should remain open.
● Turn the corresponding thumbwheel (de-
tail) in the required direction to open and
close the air vents. When the thumbwheel is in the

position, the corresponding air vent
i

s closed.
● Change the air direction using the ventila-
tion grille lever.
There are other additional, non-adjustable air
vents in the dash panel 2 , in the footwell
and in the rear area of the interior. Note
Food, medicine and other heat or cold sensi-
tive objects should never be placed in front of
the air outlets as they may be damaged or
made unsuitable for use by the air coming
from the air vents. 127
Technical specifications
Advice
Operation
Safety
The essentials

Driving
Exhaust gas filtration system Catalytic converter
Applies to vehicles with petrol engine:
the
vehicle must only be used with unleaded pet-
rol, otherwise the catalytic converter will be
irreparably damaged.
Never drive until the tank is empty; an irregu-
lar supply of fuel can cause faulty combus-
tion. In these cases, unburned fuel reaches
the exhaust system, which can overheat and
damage the catalytic converter.
Diesel particulate filter
Applies to vehicles with diesel engine: the
diesel engine particulate filter eliminates
most of the soot from the exhaust gas sys-
tem. Under normal driving conditions, the fil-
ter cleans itself. The diesel particulate filter is
cleaned automatically without need for indi-
cation by the warning lamp . This may be
noticed because the engine idle speed in-
creases and an odour may be detected.
If automatic filter purification cannot be car-
ried out (because only short trips are taken,
for example), soot will accumulate on the fil-
ter and the Diesel particulate filter warning
lamp will  switch on.
Facilitate the automatic filter cleaning proc-
ess by driving in the following manner: drive
for approximately 15 minutes at a minimum
speed of 60 km/h in 4th or 5th gear (auto- matic gearbox: gear S). Maintain the engine
speed at approximately 2,000 rpm. The rise
in temperature causes the soot on the filter
to burn. On completion of the cleaning the
warning lamp will switch off. If the warning
lamp does not switch off, go immediately to a
specialised workshop to rectify the problem.
WARNING
● Because of the high temperatures which
can occur in the exhaust gas control system
(catalytic converter or diesel particulate fil-
ter), do not park the vehicle where the ex-
haust can come into contact with flammable
materials under the car (e.g. on grass or at
the forest edge). Fire hazard!
● Do not apply wax underneath the vehicle
around the area of the exhaust system: Fire
hazard! Driving through flooded roads
To prevent damage to the vehicle when driv-
ing through water, for example, along a floo-
ded road, please observe the following:
● The water should never come above the
lower edge of the bodywork.
● Drive at pedestrian speed. WARNING
After driving through water, mud, sludge,
etc., the braking effect can be delayed slight-
ly due to moisture build-up on the discs and
brake pads. Applying the brakes carefully
several times will remove the moisture and
restore the full braking effect. CAUTION
● Driving through flooded areas may severely
damage vehicle components such as the en-
gine, transmission, running gear or electrical
system.
● Whenever driving through water, the Start-
Stop system* must be switched off
››› page 148. Note
● Check the depth of the water before enter-
ing the flooded zone.
● Do not stop in the water, drive in reverse, or
stop the engine in any situation.
● Note that vehicles travelling in the opposite
direction may splash water that could exceed
the maximum permitted water height for your
vehicle.
● Avoid driving through salt water (corro-
sion). 141Technical specifications
Advice
Operation
Safety
The essentials

Driver assistance systems
(2.5 miles), when fuel consumption will re-
turn to a normal level.
Check tyre pressure
Always make sure the tyres are inflated to the
correct pressures ››› page 208 to save fuel. If
the pr e
ssure is below half bar, fuel consump-
tion may increase by 5%. Due to the greater
rolling resistance, under-inflation
also increa-
ses tyre wear and impairs handling.
Do not use winter tyres all year round as they
increase fuel consumption by up to 10%.
Avoid carrying unnecessary loads
Given that every kilo of extra weight will in-
cr

ease the fuel consumption, it is advisable
to always check the luggage compartment to
make sure that no unnecessary loads are be-
ing transported.
Since the luggage rack increases the aerody-
namic drag of the vehicle, you should remove
it when not needed. This will save, at a speed
of 100-120 km/h (60-75 mph), 12% of fuel.
Save electrical energy
The engine drives the alternator, thereby gen-
erating electricity. This implies that any in-
crease in power consumption also increases
fuel consumption! For this reason, switch off
any unneeded electrical devices. Devices that
use a lot of electricity includes the blower at a high setting, the rear window heating or
the seat heating*. Driver assistance systems
Braking and stability systems Electronic Stability Control (ESC) The ESC helps to improve safety. It reduces
the tendency to skid and improves the stabil-
ity and roadholding of the vehicle. The ESC
detects critical handling situations, such as
vehicle understeer or oversteer, or wheelspin
on the driving wheels. It stabilises the vehi-
cle by braking individual wheels or by reduc-
ing the engine torque. The warning lamp will
flash on the instrument panel when the ESC
is intervening
.
ESC includes the Anti-lock brake system
(ABS), the brake assist system, the traction
control system (ASR), electronic differential
lock (EDL), electronic self-locking*, selective
torque control* and tractor-trailer sway miti-
gation*. ESC also helps stabilise the vehicle
by changing the torque.
Anti-lock brake system (ABS)
ABS prevents the wheels from locking up un-
der braking until the vehicle has reached a
virtual standstill. You can continue to steer
the vehicle even when the brakes are on full.
Keep your foot on the brake pedal and do not
pump the brakes. You will feel the brake ped-
al pulsate while the ABS is working. »
143
Technical specifications
Advice
Operation
Safety
The essentials

Driver assistance systems
Distance margin selected, the ACC is in-
active.
Vehicle detected in front. The ACC is ac-
tive.
Adjustment of the temporary distance
from the vehicle in front with a program-
med speed.
Temporary distance adjustment from the
vehicle in front with a programmed
speed.
Warning and control lamps
››› in Control and warning lamps on
page 71 . The speed reduction by the ACC to
maintain the distance from the vehi-
cle in front is not sufficient.
Brake! apply the foot brake! Driver intervention prompt.

The ACC is not currently available.
a)
With the vehicle stationary, switch off the engine and
start it up again. Check the radar sensor visually for dirt,
ice or knocks. If it is still unavailable, refer to a special-
ised workshop to have the system inspected.
a)
The symbol on the instrument panels with colour display is in
colour. 
The ACC is active.
No vehicle is detected in front. The programmed speed
remains constant.2
3
4
5 
If the symbol is white: the ACC is ac-
tive.
A vehicle in front has been detected. The ACC adjusts
speed and distance from the vehicle in front. 
If the symbol is grey: the ACC is not
active.
The system is switched on, but is not adjusting.


The ACC is active.
Some warning and control lamps will light up
briefly when the ignition is switched on to
check certain functions. They will switch off
after a few seconds.
WARNING
Observe the safety warnings ››› in Control
and warning lamps on page 71. Note
When the ACC is connected, the indications
on the instrument panel screen may be con-
cealed by warnings from other functions,
such as an incoming call. Radar sensor
Fig. 151
On the front bumper: radar sensor. A radar sensor is installed on the front bump-
er to determine the traffic situation
››› Fig. 151 1 . This sensor can detect vehi-
cles in front up to a distance of approximately
120 m.
The radar sensor's visibility may be impaired
by dirt, mud or snow, or by environmental in-
fluences such as rain or mist. In this case the
adaptive cruise control (ACC) does not work.
The instrument panel displays the following
message: ACC: No sensor vision! If necessary
clean the radar sensor ››› .
When the radar sensor begins to operate
properly again, the ACC will automatically be
available again. The message on the instru-
ment panel screen will switch off and the ACC
will be reactivated again. »
153
Technical specifications
Advice
Operation
Safety
The essentials

Operation
You should always reduce speed immediately
if the trailer shows the slightest sign of snak-
ing . Never try to stop the “snaking” by in-
c r
easing speed.
Always brake in due course. If the trailer has
an overrun brake, apply the brakes gen
tly at
first and then, firmly. This will prevent the
jerking that can be caused by locking of trail-
er wheels. Select a low gear in due course
before going down a steep downhill. This en-
ables you to use the engine braking to slow
down the vehicle.
Reheating
At very high temperatures and during pro-
longed slopes, driving in a low gear and high
engine speed, always monitor the coolant
temperature gauge ››› page 71.
Electronic stability control*
The ESC* system helps to stabilise the trailer
in case of skidding or rocking. Retrofitting a towing bracket*
Fig. 172
Attachment points for towing brack-
et. If a towing bracket is to be fitted after the ve-
hicle is purchased, this must be completed
according to the instructions of the towing
bracket manufacturer.The attachment points for the towing bracket
A are on the lower part of the vehicle.
The distance between the centre of the ball
coupling and the ground should never be
lower than the indicated value, even with a
fully loaded vehicle and including the maxi-
mum drawbar load.
Elevation values for securing the towing
bracket:
B65 mm (minimum)
C350 mm to 420 mm (fully laden vehicle)
D1040 mm
E317 mm
FLEON/LEON SCLEON ST
319 mm596 mm Fitting a towing bracket
●
Driving with a trailer involves an extra effort
for the vehicle. Therefore, before fitting a
towing bracket, please contact a Technical
Service to check whether your cooling system
needs modification.
● The legal requirements in your country
must be observed (e.g. the fitting of a sepa-
rate control lamp).
● Certain vehicle components, e.g. the rear
bumper, must be removed and reinstalled.
The towing bracket securing bolts must be
180

Checking and refilling levels
especially if the battery is not fully charged
initially.
To restore the necessary energy balance, the
system will then temporarily shut off the elec-
trical devices that are using a lot of power, or
reduce the current they are consuming. Heat-
ing systems in particular use a large amount
of electrical power. If you notice, for instance,
that the seat heating* or the rear window
heater is not working, they may have been
temporarily switched off or regulated to a
lower heat output. These systems will be
available again as soon as sufficient electri-
cal power is available.
You may also notice that the engine runs at a
slightly faster idling speed when necessary.
This is quite normal, and no cause for con-
cern. The increased idling speed allows the
alternator to meet the greater power require-
ment and charge the battery at the same
time. Checking and refilling levels
Refuelling Filling the tank Read the additional information carefully
›››  page 31
If the automatic filler nozzle is operated cor-
rectly, it will switch itself off as soon as the
fuel tank is “full”. Do not try to put in more
fuel after the nozzle cuts out, as this will fill
the expansion chamber in the fuel tank.
The correct fuel grade for your vehicle is giv-
en on a sticker on the inside of the fuel tank
flap. Further notes on fuel can be found at
››› page 195 .
The c ap
acity of the fuel tank is listed in the
vehicle
technical specifications ›››
page 268. WARNING
Fuel is highly flammable and can cause seri-
ous burns and other injuries.
● Do not smoke when filling the fuel tank or a
canister. Naked flames are forbidden in the
vicinity due to the risk of explosion.
● Observe legislation governing the use,
storage and carrying of a spare fuel canister
in the vehicle.
● For safety reasons we do not recommend
carrying a spare fuel canister in the vehicle. In an accident the canister could be damaged
and could leak.
●
If, in exceptional circumstances, you have
to carry a spare fuel canister, please observe
the following points:
– Never fill fuel into the spare fuel canister
if it is inside or on top of the vehicle. An
electrostatic charge could build up during
filling, causing the fuel vapour to ignite.
Danger of explosion. Always place the
canister on the ground to fill it.
– Insert the filling nozzle as far as possible
into the spare fuel canister.
– If the spare fuel canister is made of met-
al, the filling nozzle must be in contact
with the canister during filling. This
helps prevent an electrostatic charge
building up.
– Never spill fuel in the vehicle or in the
luggage compartment. Fuel vapour is ex-
plosive. Risk of fatal accident! CAUTION
● If any fuel is spilt onto the vehicle, it
should be removed immediately. It could oth-
erwise damage the paintwork.
● Never run the tank completely dry. An irreg-
ular fuel supply could cause misfiring. As a
result, unburnt fuel could enter the exhaust
system and damage the catalytic converter.
● When filling the fuel tank after having run it
completely dry on a vehicle with a diesel en-
gine, the ignition must be switched on for at » 193
Technical specifications
Advice
Operation
Safety
The essentials

Advice
least 30 seconds before starting the engine.
When you then start the engine it may take
longer than normal (up to one minute) to
start firing. This is because air needs to be
bled from the fuel system while starting.
For the sake of the environment
Do not overfill the fuel tank, it may cause the
fuel to overflow if it becomes warm. Note
Diesel vehicles are fitted with a protective de-
vice that prevents the insertion of the wrong
fuel hose 1)
. It is only possible to refuel with
Diesel nozzles.
● If the pump nozzle is worn, damaged, or if
it is very small, it is possible that it will not
be able to open the protective device. Before
trying to insert the pump nozzle by turning it,
try a different pump or request specialist
help.
● If you fill the tank from a reserve fuel canis-
ter, the protective device will not open. One
way to resolve this is to pour the fuel in very
slowly. Refuelling with natural gas
Fig. 173
Tank flap open: gas filler mouth 1 ,
filler mouth retainer 2 Before refuelling, the engine and the igni-
tion, mobile telephone and heating must be
switched off separately
››› .
Read the instructions on how to use the natu-
ral gas pump carefully.
The vehicle is not prepared for refuelling with
liquefied natural gas (LNG) ››› . Before refu-
elling with natural gas, make sure you add
the appropriate type of fuel ››› page 195.
Opening the fuel tank cap
The natural gas filler mouth is behind the fuel
tank cap, next to the petrol filler mouth. ●
Unlock the vehicle with the key or with the
central locking button  situated on the driv-
er door ››› page 82 .
● Pr e
ss on the rear area of the flap and open
it.
Refuelling
Things to note: if the ambient temperature is
very high, the natural gas pump protection
against overheating disconnects this auto-
matically.
● Remove the plug from the gas filler mouth
››› Fig. 173 1 .
● Connect the pump filling nozzle to the gas
filler mouth.
● The fuel tank will be full when the pump
c ompr

essor automatically cuts the supply.
● If you wish to finish refuelling in advance,
press the button on the pump to stop the
flow.
Closing the fuel tank cap
● Check that the gas filler mouth retainer 2 is not trapped with the filler nozzle. If neces-
sary, place it in the filler mouth again.
●
Insert the plug in the filler mouth.
● Close the tank flap. Make sure you hear it
click into place. 1)
Depending on country
194