2021-2026 Seat Leon 4 Door Practical tips -> Engine compartment User Manual
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Practical tips -> Engine compartment for Your Seat Leon 4 Door Fourth Generation (2021-2026)

Practical tips  
particulate filter needs cleaning (regenera-  
tion).  
Consider the legal speed limits as well as  
the particulate filter is not affected. Also  
avoid making short trips all the time.  
the recommended gears.  
End the regeneration journey once the con-  
Regeneration of the petrol particulate fil-  
ter (only for 2.0l TSI engines)  
trol warning lamp has gone out.  
If the warning lamp stays on after 30 minutes  
of running in regeneration mode, have a spe-  
cialised workshop repair the fault  
Engine compartment  
Requirements for the regeneration journey:  
the engine is at operating temperature.  
Working in the engine compart-  
ment  
Drive at a speed of at least 80 km/h  
›››  
WARNING  
Completely remove your foot from the ac-  
Always adjust your speed to suit the weath-  
er conditions, roads, braking distance and  
traffic if the particulate filter is in its regen-  
eration phase. Route recommendations  
should never make you disregard each  
country's specific traffic regulations.  
celerator pedal for a few seconds to let the  
vehicle roll with the gear engaged.  
Always be aware of the danger of injury and  
scalding as well as the risk of accident or fire  
when working in the engine compartment  
(e.g. when checking and refilling fluids).  
Consider the legal speed limits as well as  
the recommended gears.  
Always observe the warnings listed below  
and follow all general safety precautions.  
Repeat this procedure (accelerate and let  
roll) until the control lamp turns off.  
CAUTION  
The vehicle's engine compartment is a po-  
This procedure involves an autonomous par-  
ticulate filter cleaning process and may take  
some time.  
tentially hazardous area  
.
›››  
When the exhaust system detects that  
the particulate filter is close to saturation,  
the self-cleaning function of this system  
recommends optimal driving for this func-  
tion.  
WARNING  
If the warning lamp does not turn off, go im-  
mediately to a specialised workshop to repair  
the fault.  
When work is done in the engine compart-  
ment, injuries, burns, accidents and even  
fires can occur.  
Due to the high temperatures caused by  
the regeneration of the particulate filter, it  
is possible that the radiator fan will acti-  
vate after stopping the engine, even it its  
operating temperature has not been  
reached.  
Turn off the engine, disconnect the igni-  
Regeneration of the petrol (except the TSI  
2.0l engine) and diesel particulate filter  
tion e and apply the electronic parking  
brake. If the vehicle has a manual gearbox,  
place the lever in neutral; if it has an auto-  
matic gearbox, activate the parking lock  
(button P). Wait for the engine to cool  
down.  
Requirements for the regeneration journey:  
the engine is at operating temperature.  
Noise, smells and high idle speeds can  
Drive at a speed of between 50-120 km/h  
(31-75 mph). This increases the temperature  
and burns the soot in the filter  
occur during regeneration.  
Never open the bonnet if you see steam  
Always use the correct engine oil and the  
.
›››  
or drips of coolant being released from the  
correct fuel to make sure the useful life of  
326  
Checking and refilling levels  
engine compartment. Wait until no steam  
or coolant can be seen before opening the  
bonnet.  
accident!. A hydraulic jack is insufficient for  
securing the vehicle and there is a risk of  
injury.  
For the sake of the environment  
Inspect the ground underneath your vehi-  
cle regularly so that any leaks are detec-  
ted at an early stage. If you find spots of oil  
or other fluids in the area where it was  
parked, have your vehicle inspected at the  
workshop.  
Keep children away from the engine  
If any work has to be performed when the  
compartment.  
engine is started or with the engine running,  
there is an additional, potentially fatal,  
safety risk from the rotating parts, such as  
the drive belts, alternator, radiator fan, etc.,  
and from the high-voltage ignition system.  
You should also observe the following:  
Never spill liquids used for vehicle opera-  
tion on the engine compartment, as these  
may catch fire (e.g. the antifreeze in cool-  
ant).  
Service fluids leaks are harmful to the en-  
vironment. For this reason you should make  
regular checks on the ground underneath  
your vehicle. If you find spots of oil or other  
fluids, have your vehicle inspected in a  
specialised workshop.  
Avoid causing short-circuits in the elec-  
Never touch the electrical wiring of the  
ignition system.  
trical system, particularly at the points  
where the jump leads are attached  
page 53. The battery could explode.  
Ensure that jewellery, loose clothing  
and long hair do not get trapped in ro-  
tating engine parts. Danger of death.  
Before starting any work remove jewel-  
lery, tie back and cover hair, and wear  
tight-fitting clothes.  
›››  
If working inside the engine compart-  
ment, remember that, even when the igni-  
tion is switched off, the radiator fan may  
start up automatically, and therefore there  
is a risk of injury.  
Note  
In right-hand drive vehicles some brake flu-  
id reservoirs are on the other side of the en-  
gine compartment Fig. 227.  
›››  
Never accelerate with a gear engaged  
without taking the necessary precau-  
tions. The vehicle could move, even if  
the handbrake is applied. Danger of  
death.  
Never cover the engine with additional in-  
sulating materials such as a blanket. Risk of  
fire!  
Do not unscrew the cap on the coolant  
expansion tank when the engine is hot. The  
cooling system is under pressure.  
Observe the following additional warn-  
ings if work on the fuel system or the elec-  
trical system is necessary:  
Protect face, hands and arms by cover-  
ing the cap with a large, thick rag to protect  
against escaping coolant and steam.  
Always disconnect the 12-volt vehicle  
battery from the on-board network.  
Always make sure you have not left any  
Do not smoke.  
objects, such as cleaning cloths or tools, in  
the engine compartment.  
Never work near naked flames.  
If you have to work underneath the vehi-  
Always keep an approved fire extin-  
guisher immediately available.  
cle, you must use suitable stands addition-  
ally to support the vehicle, there is a risk of  
327  
Practical tips  
Opening the bonnet  
If the bonnet does not close, do not press  
downwards. Open it again and let it fall as  
mentioned above.  
Opening and closing the bonnet  
The bonnet is released from inside the vehi-  
cle.  
Before opening the bonnet, make sure that  
the windscreen wiper arms are in place  
against the windscreen.  
WARNING  
Make sure that the bonnet is properly  
closed. If it opens when driving, it can  
cause an accident.  
Open the door and pull the lever under the  
1
dashboard Fig. 225  
.
›››  
CAUTION  
To lift the bonnet, press towards the left on  
the lever located under the bonnet, in the  
To avoid damage to the bonnet and to the  
windscreen wiper arms, only open it when  
the windscreen wipers are in place against  
the windscreen.  
2
centre Fig. 226 . The arrester hooks are  
›››  
Fig. 225 Release lever in the driver's footwell  
area.  
released.  
The bonnet can be opened. Release the  
bonnet stay and secure it in the fixture de-  
signed for this in the bonnet.  
Closing the bonnet  
Slightly lift the bonnet.  
Release the bonnet stay and replace it in its  
support.  
At a height of approximately 20 cm let it fall  
so it locks.  
Fig. 226 Lever under the bonnet.  
328  
Checking and refilling levels  
Checking levels  
Fig. 227 Diagram for the location of the various el-  
ements.  
6
From time to time, the levels of the different  
fluids in the vehicle must be checked. Never  
fill with incorrect fluids, otherwise serious  
damage to the engine may be caused.  
Windscreen washer reservoir  
page 336  
›››  
Note  
The layout of parts may vary depending on  
the engine.  
1
Coolant expansion tank page 333  
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2
3
4
5
Engine oil level dipstick page 331  
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Engine oil filler cap page 332  
›››  
Brake fluid reservoir page 335  
›››  
Battery 1) page 337  
›››  
1)  
In plug-in hybrid vehicles (PHEV) the battery is  
in the luggage compartment page 339.  
›››  
329  

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