2013 Seat Leon 5D check engine

248Checking and refilling levels
The engine management automatically adapts to the natural gas used ac-
cording to its quality. Therefore, different quality gases can be mixed in the
tank, without the need for comprehensive draining before applying a differ-
ent quality gas.
The instrument panel display shows information on the current natural gas
quality ⇒ page 73.
Natural gas and safety
If you can smell gas or suspect that there is a leak ⇒ 
:
● Stop the vehicle immediately.
● Switch the ignition off.
● Open the doors to appropriately ventilate the vehicle.
● Extinguish cigarettes immediately.
● Move away from the vehicle or switch off objects that may cause sparks
or a fire.
● If you continue to smell gas, do not continue driving!
● Seek specialist assistance. Have the fault repaired.
WARNING
Failure to act when you can smell gas in the vehicle or when refuelling
can cause serious injuries.
● Carry out the necessary operations.
● Leave the danger zone.
● If necessary, warn the emergency services.
WARNING
The vehicle is not prepared to use liquefied natural gas (LNG) and this
fuel must not be added under any circumstances. Liquefied natural gas
can cause the natural gas tank to explode resulting in serious injury.
Note
Have natural gas system checked regularly by a specialised workshop in ac-
cordance with the Maintenance Programme. 
Filling the tank Filling the tank
Fig. 151 Fuel tank flap
with tank cap attached
The flap that covers the tank cap is unlocked and locked automati-
cally by the central locking.
Opening the fuel tank cap
– Open the fuel tank flap, by pressing on the left side.
– Unscrew the fuel tank cap anti-clockwise. 

249
Checking and refilling levels
– Place the cap in the housing on the hinge of the open flap
⇒ Fig. 151.
Closing the fuel tank cap
– Screw on the tank cap clockwise until it you hear it click into po-
sition.
– Close the tank flap. Make sure you hear it click into place.
If the automatic filler nozzle is operated correctly, 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 given on a sticker on the inside of
the fuel tank flap. Further notes on fuel can be found at ⇒ page 246.
The capacity of the fuel tank is listed in the vehicle technical specifications
⇒ page 323.
WARNING
Fuel is highly flammable and can cause serious 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.
WARNING (Continued)
● For safety reasons we do not recommend carrying a spare fuel canis-
ter 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 canis-
ter, 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, caus-
ing 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 canis-
ter.
– If the spare fuel canister is made of metal, 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 explosive. Risk of fatal accident!
CAUTION
● If any fuel is spilt onto the vehicle, it should be removed immediately. It
could otherwise damage the paintwork.
● Never run the tank completely dry. An irregular fuel supply could cause
misfiring. As a result, unburnt fuel could enter the exhaust system and dam-
age the catalytic converter.
● When filling the fuel tank after having run it completely dry on a vehicle
with a diesel engine , the ignition must be switched on for at least 30 sec-
onds before starting the engine. When you then start the engine it may take
longer than normal (up to one minute) for the engine to start firing. This is
because air needs to be bled from the fuel system while starting. 
Safety FirstOperating instructionsPractical TipsTechnical specifications

250Checking and refilling levels
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 device 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 canister, the protective device will
not open. One way to resolve this is to pour the fuel in very slowly. 
Refuelling natural gas
Fig. 152 Tank flap open:
gas filler mouth 1, filler
mouth retainer 2
Before refuelling, the engine and the ignition, mobile telephone and heat-
ing must be switched off separately
⇒ .
Read the instructions on how to use the natural gas pump carefully.
The vehicle is not prepared for refuelling with liquefied natural gas (LNG)
⇒ 
. Before refuelling with natural gas, make sure to add the appropriate
type of fuel ⇒ page 246.
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 
situ-
ated on the driver door ⇒ page 87.
● Press on the rear area of the flap and open it.
Refuelling
Thing to note: if the ambient temperature is very high, the natural gas pump
protection against overheating may disconnect this automatically.
● Remove the plug from the gas filler mouth ⇒ Fig. 152 1
.
● Connect the pump filling nozzle to the gas filler mouth.
● The fuel tank will be full when the pump compressor 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 necessary, 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)
according to the country

251
Checking and refilling levels
WARNING
Natural gas is a highly explosive, easily flammable substance. Incorrect
handling of the natural gas can cause accidents serious burns and other
injuries.
● Before refuelling with natural gas, engage the filler neck correctly. If
you smell gas, stop refuelling immediately.
WARNING
The vehicle is not prepared to use liquefied natural gas (LNG) and this
fuel must not be added under any circumstances. Liquefied natural gas
can cause the natural gas tank to explode resulting in serious injury.
Note
● The filling nozzles of all natural gas pumps might not be operated in the
same way. If you do not know, ask a qualified employee at the petrol station
to do the refuelling.
● Noises heard when refuelling are normal and do not indicate the pres-
ence of damage to the system.
● The vehicle natural gas system is prepared both for refuelling with a
small compressor (slow refuel) and a large compressor (fast refuel) in natu-
ral gas service stations. Bonnet
Working on components in the engine compartment
Extra caution is necessary when working on components in
the engine compartment. Always be aware of the danger of injury and scalding as well as the risk of
accident or even fire when working in the engine compartment (e.g. when
checking and refilling fluids). Always observe the warnings listed below
and follow all general safety precautions. The engine compartment of the
vehicle is a potentially hazardous area ⇒ 
.
WARNING
● Switch the ignition off.
● Remove the ignition key.
● Apply the handbrake.
● If the vehicle has a manual gearbox, place the lever in neutral; if it
has an automatic gearbox, place the selector lever in position P.
● Wait for the engine to cool down.
● Keep children away from the engine compartment.
● Never spill liquids used for vehicle operation on the engine compart-
ment, as these may catch fire (e.g. the antifreeze in coolant).
● Take care not to cause short circuits in the electrical system, especial-
ly when working on the battery.
● If working inside the engine compartment, remember that, even when
the ignition is switched off, the radiator fan may start up automatically,
and therefore there is a risk of injury.
● Do not unscrew the cap on the coolant expansion tank when the en-
gine is hot. The cooling system is under pressure. 
Safety FirstOperating instructionsPractical TipsTechnical specifications

252Checking and refilling levels
WARNING (Continued)
● Protect face, hands and arms by covering the cap with a large, thick
rag to protect against escaping coolant and steam.
● If it is necessary to work in the engine compartment while the engine
is running, the rotating components (for example, poly-V belt, alternator,
radiator fan) and the high voltage ignition system are an additional haz-
ard.
● Observe the following additional warnings if work on the fuel system
or the electrical system is necessary:
–Always disconnect the battery from the on-board network.
– Do not smoke.
– Never work near naked flames.
– Always keep an approved fire extinguisher immediately available.
CAUTION
When changing or topping up service fluids, make absolutely certain that
you fill the fluids into the correct reservoirs. Using the wrong fluids could
cause serious malfunctions and engine damage!
For the sake of the environment
Inspect the ground underneath your vehicle regularly so that any leaks are
detected at an early stage. If you find spots of oil or other fluids, have your
vehicle inspected at the workshop.
Note
On right-hand drive vehicles* some of the containers/reservoirs mentioned
below are located on the other side of the engine compartment. Opening the bonnet
The bonnet is released from inside the vehicle.
Fig. 153 Release lever in driver footwell and cam below the bonnet
Check that the windscreen wiper arms are not unfolded. Otherwise
the paint may be damaged.
The bonnet can only be unlocked when the driver door is open.
– Pull the lever under the dash panel in the direction of the arrow
1
⇒ Fig. 153.
– Lift the bonnet slightly ⇒ 
.
– Press the release catch under the bonnet upwards ⇒ Fig. 153
2
. This will release the arrester hook under the bonnet.
– Open the bonnet. Release the bonnet stay and secure it in fix-
ture designed for this in the bonnet. 

253
Checking and refilling levels
WARNING
Never open the bonnet if you see steam or drips of coolant being re-
leased from the engine compartment. Failure to comply could result in
burns. Wait until no steam or coolant can be seen before opening the
bonnet.

Closing the bonnet
– Slightly raise the bonnet.
– Release the bonnet stay before pressing it back into its support.
– Carefully close the bonnet.
– Press the bonnet down until it locks into place.
– Make sure that the bonnet catches onto its clasp. Do not press
down too hard ⇒ 
.
WARNING
● For safety reasons the bonnet must always be completely closed
when the vehicle is moving. Therefore, after closing the bonnet, always
check that the locking element is properly engaged. This is the case if
the bonnet is flush with the adjacent body panels.
● Should you notice that the bonnet is not safely secured when the ve-
hicle is moving, stop the vehicle immediately and close the bonnet. Fail-
ure to do so could result in an accident.
 Engine oil
General notes
The engine comes with a special, multi-grade oil that can be used all year
round.
Because the use of high-quality oil is essential for the correct operation of
the engine and its long useful life, when topping up or changing oil, use on-
ly those oils that comply with VW standards.
The specifications (VW standards) set out in the following page should ap-
pear on the container of the service oil; when the container displays the
specific standards for petrol and diesel engines together, it means that the
oil can be used for both types of engines.
We recommend that the oil change, indicated in the Maintenance Pro-
gramme, be performed by a Technical Service or a specialised workshop.
The correct oil specifications for your engine are listed in the ⇒ page 254,
Oil properties.
Service intervals
Service intervals can be flexible (LongLife service) or fixed (dependent on
time/distance travelled).
If the PR code that appears on the back of the “Maintenance Programme”
booklet is PR QI6, this means that your vehicle has the LongLife service pro-
grammed. If it lists the codes QI1, QI2, QI3, QI4 or QI7, the interval service
is dependent on time/distance travelled.
Flexible service intervals (LongLife service intervals*)
Special oils and processes have been developed which, depending on the
characteristics and individual driving profiles, enable the extension of the
oil change service (LongLife service intervals). 
Safety FirstOperating instructionsPractical TipsTechnical specifications

254Checking and refilling levels
Because this oil is essential for extending the service intervals, it must only
be used observing the following indications:
● Avoid mixing it with oil for fixed service intervals.
● Only in exceptional circumstances, if the engine oil level is too low
⇒  page 255 and LongLife oil is not available, it is permitted to top up
(once) with oil for fixed service intervals ⇒  page 254 (up to a maximum of
0.5 litres).
Fixed service intervals*
If your vehicle does not have the “LongLife service interval” or it has been
disabled (by request), you may use oils for fixed service intervals, which al-
so appear in ⇒  page 254, Oil properties. In this case, your vehicle must be
serviced after a fixed interval of 1 year/15 000 km (10 000 miles)(whatever
comes first) ⇒ Booklet Maintenance Programme.
● In exceptional circumstances, if the engine oil level is too low
⇒  page 255 and you cannot obtain the oil specified for your vehicle, you
can put in a small quantity of oil conforming to the specification ACEA A2 or
ACEA A3 (petrol engines) or ACEA B3 or ACEA B4 (diesel engines) (up to 0.5
l).
Vehicles with diesel particulate filter*
The “Maintenance Programme” states whether your vehicle is fitted with a
diesel particulate filter.
Only VW 507 00 engine oil, with reduced ash formation, may be used in die-
sel engines equipped with particulate filter. Using other types of oil will
cause a higher soot concentration and reduce the life of the DPF. Therefore:
● Avoid mixing this oil with other engine oils.
● Only in exceptional circumstances, if the engine oil level is too low
⇒  page 255 and you cannot obtain the oil specified for your vehicle, you
can use a small quantity of oil (once) conforming to the VW 506 00,
VW 506 01, VW 505 00, VW 505 01 or ACEA B3/ACEA B4 specification. (up
to 0.5 l). Oil properties
Engine typeSpecificationPetrol without flexible service in-
tervalVW 502 00/VW 504 00
Petrol with flexible service inter-
val (LongLife)VW 504 00
Diesel. Engines without Particu-
late filter (DPF)VW 505 01/VW 506 01/VW 507 00
Diesel. Particulate Filter Engines
(DPF).
With or without flexible service in-
terval (with and without Long-
life)
a)VW 507 00
a)
Only use recommended oils, otherwise you may damage the engine.
Engine oil additives
No type of additive should be mixed with the engine oil. The deterioration
caused by these additives is not covered by the warranty.
Note
Before a long trip, we recommend finding an engine oil that conforms to the
corresponding VW specifications and recommend keeping it in the vehicle.
This way, the correct engine oil will always be available for a top-up if nee-
ded. 

255
Checking and refilling levels
Checking engine oil level
The engine oil dipstick indicates the level of the oil.
Fig. 154 Engine oil dip-
stick
Checking oil level
– Park the vehicle in a horizontal position.
– Briefly run the engine at idle speed until the operating tempera-
ture is reached and then stop.
– Wait two minutes.
– Pull out the dipstick. Wipe the dipstick with a clean cloth and
insert it again, pushing it in as far as it will go.
– Then pull it out once more and check the oil level ⇒ Fig. 154.
Top up with engine oil if necessary.
Oil level in area A
Do not add oil
⇒ .
– Oil level in area
B
You can add oil, but keep the level in this zone.
Oil level in area C
Oil
must be added. Afterwards, the oil level should be in the lined area
B.
Depending on how you drive and the conditions in which the vehicle is
used, oil consumption can be up to 0.5 l/1000 km. Oil consumption is likely
to be higher for the first 5000 km. For this reason the engine oil level must
be checked at regular intervals, preferably when filling the tank and before
a journey.
WARNING
Any work carried out in the engine compartment or on the engine must
be carried out cautiously.
● When working in the engine compartment, always observe the safety
warnings ⇒ page 251.
CAUTION
If the oil level is above the area A do not start the engine. This could result
in damage to the engine and catalytic converter. Contact a Technical Serv-
ice. 
–
–
Safety FirstOperating instructionsPractical TipsTechnical specifications