2025-2026 Audi A5 4 Door Checking and Filling -> Engine compartment User Manual
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Checking and Filling -> Engine compartment for Your Audi A5 4 Door Third Generation (2025-2026)

Checking and Filling  
Manually releasing the fuel filler door  
Malfunction Indicator Lamp (MIL)  
See an authorized Audi dealer or authorized  
Audi Service Facility if you cannot open the fuel  
filler door.  
Afterward, drive to an authorized Audi dealer or  
authorized Audi Service Facility to have the  
malfunction corrected.  
If the  
indicator light blinks or turns on, there  
is a malfunction related to emissions which can,  
for example, cause poor emissions quality and  
damage to the catalytic converter. Drive slowly to  
an authorized Audi dealer or authorized Audi  
Service Facility to have the malfunction correct-  
ed.  
Emissions control  
system  
The indicator light can also turn on if the fuel fill-  
1)  
er cap is not closed correctly ðpage 235  
.
General information  
Engine compartment  
WARNING  
General information  
The temperature of the exhaust system is  
high, both when driving and after stopping  
the engine.  
Special care is required if you are working in the  
engine compartment  
For work in the engine compartment, such as  
checking and filling fluids, there is a risk of in-  
jury, scalding, accidents, and burns. For this  
reason, follow all the warnings and general  
safety precautions provided in the following in-  
formation. The vehicle's engine compartment is  
Never touch the exhaust tail pipes once they  
have become hot. This could result in burns.  
Do not park your vehicle over flammable  
materials such as grass or leaves because  
the high temperature of the emissions sys-  
tem could start a fire.  
a dangerous area. ð  
.
Do not apply underbody protectant in the  
exhaust system area, because this increases  
the risk of fire.  
Explanation of warning symbols:  
Observe all warnings - there is a risk for  
injury!  
Catalytic converter  
Hot engine components!  
Rotating parts!  
Observe the safety precautions ðpage 237, Gen-  
eral information.  
The radiator fan can turn on at any time!  
.
The vehicle may only be driven with unleaded  
gasoline, or the catalytic converter will be de-  
stroyed.  
High voltage! Turn off the engine before  
coming into contact with any ignition  
system components!  
Never drive until the tank is completely empty.  
The irregular supply of fuel that results from that  
can cause engine misfires. Uncombusted fuel  
could enter the exhaust system, which could  
cause overheating and damage to the catalytic  
converter.  
The catalytic converter can be damaged  
if the oil level is too high!  
Hot coolant - there is a risk of scalding!  
Always follow the instructions in the  
Owner’s Manual.  
1)  
Depending on the engine and country  
237  
Checking and Filling  
To protect your face, hands, and arms from  
hot steam or coolant, cover the cap with a  
thick cloth when opening.  
WARNING  
The engine/motor compartment in any motor  
vehicle is a potentially dangerous area and  
can cause serious personal injury.  
Do not remove the engine cover under any  
circumstances. This increases the risk of  
burns.  
Always use extreme caution when doing any  
work in the engine compartment. Always  
follow commonly accepted safety practices  
and use common sense. Never risk personal  
injury.  
Due to the risk of electric shock, never touch  
the ignition cable or other components in  
the electronic high-voltage ignition system  
when the engine is running or is starting.  
If a position is selected while the vehicle is  
stationary and the engine is running, do not  
press the accelerator pedal inadvertently.  
Pressing the accelerator pedal will cause the  
vehicle to move, and this could result in an  
accident.  
Never perform any work in the engine com-  
partment unless you know exactly how to  
carry out the job and have the correct tech-  
nical information and the correct tools.  
If you are uncertain about what to do, have  
the work performed by an authorized Audi  
dealer, an authorized Audi Service Facility,  
or another qualified workshop. Serious per-  
sonal injury may result from work that is not  
performed correctly.  
If inspections or repairs must be performed  
while the engine is running, moving compo-  
nents (such as the ribbed belt, generator,  
and radiator fan) pose an additional risk.  
Set the parking brake first and select the  
“P” (Park) position.  
WARNING  
Turn off the engine.  
Always make sure that no parts of the  
body, jewelry, ties, loose clothing, and  
long hair can be caught in moving engine  
components. Before any work, always re-  
move any jewelry and/or ties, tie back long  
hair, and make sure all clothing fits close  
to the body to reduce the risk of anything  
becoming caught in engine components.  
Pay attention to the following warnings list-  
ed when work on the fuel system or on the  
electrical equipment is required.  
Turn off the ignition.  
Set the parking brake.  
Select the “P” (Park) position.  
Allow the engine to cool.  
Keep children away from the engine com-  
partment.  
Never spill fluids on a hot engine. These flu-  
ids (such as the freeze protection contained  
in the coolant) can catch fire.  
Avoid short circuits in the electrical system.  
Never reach into the radiator fan. The fan is  
temperature-controlled and can turn on  
suddenly, even when the ignition is turned  
off.  
Do not smoke.  
Never work near open flames.  
Always have a working fire extinguisher  
nearby.  
Never open the hood when there is steam or  
coolant escaping from the engine compart-  
ment, because there is a risk that you could  
be burned. Wait until no steam or coolant is  
escaping.  
All work on the battery or electrical system  
in your vehicle can result in injuries, chemi-  
cal burns, accidents, or burns. Because of  
this, all work must be performed only by an  
authorized Audi dealer or authorized Audi  
Service Facility.  
The cap on the coolant expansion tank must  
never be opened when the coolant is hot.  
The cooling system is under pressure. There  
is a risk of burns  
Limit your exposure to exhaust and chemi-  
cals to as short a time as possible.  
238  
Checking and Filling  
WARNING  
California Proposition 65 Warning:  
Engine exhaust, some of its constituents,  
and certain vehicle components contain or  
emit chemicals known to the State of Cali-  
fornia to cause cancer and birth defects and  
reproductive harm. In addition, certain flu-  
ids contained in vehicles and certain prod-  
ucts of component wear contain or emit  
chemicals known to the State of California  
to cause cancer and birth defects or other  
reproductive harm.  
Fig. 159 Unlocked hood: lever  
Observe the safety precautions ðpage 237, Gen-  
eral information.  
Battery posts, terminals and related acces-  
sories contain lead and lead compounds,  
chemicals known to the State of California  
to cause cancer and reproductive harms.  
Wash hands after handling.  
Make sure the wiper arms are not raised up from  
the windshield. Otherwise the paint could be  
damaged.  
Opening the hood  
1)  
With the door open, pull the lever below  
Note  
the instrument panel in the direction of the ar-  
When filling fluids, be sure not to add any flu-  
ids to the wrong reservoirs. Otherwise severe  
malfunctions and engine damage will occur.  
row ðfig. 158.  
Raise the hood slightly ð  
Press the lever ðfig. 159 in the direction of the  
arrow. This releases the hooks.  
Open the hood.  
.
For the sake of the environment  
You should regularly check the ground under  
your vehicle in order to detect leaks quickly. If  
there are visible spots from oil or other fluids,  
bring your vehicle to an authorized Audi deal-  
er or authorized Audi Service Facility to be  
checked.  
Closing the hood  
Push the hood down until you override the  
force of the struts.  
Let the hood fall lightly into the latch. Do not  
press it in. ð  
.
Messages  
Opening and closing the hood  
The following messages may appear, depending  
on the vehicle equipment:  
The hood is released from inside the vehicle.  
Warning! Hood is not locked. Stop vehicle  
and check the lock  
The hood latch is not locked correctly. Stop im-  
mediately and close the hood.  
WARNING  
Never open the hood when there is steam or  
coolant escaping from the engine compart-  
ment, because there is a risk that you could  
Fig. 158 Footwell: release lever  
1)  
The symbol is not available in all countries.  
239  
Checking and Filling  
be burned. Wait until no steam or coolant is  
escaping.  
hood is latched if the front corners cannot  
be lifted.  
For safety reasons, the hood must always be  
latched securely while driving. Because of  
this, always check the hood after closing it  
to make sure it is latched correctly. The  
If you notice that the hood is not latched  
while you are driving, stop immediately and  
close it, because driving when the hood is  
not latched increases the risk of an accident.  
Engine compartment overview  
The most important check points.  
Fig. 160 Engine compartment overview: diagram  
Observe the safety precautions ðpage 237, Gen-  
eral information.  
6
Brake fluid reservoir () ðpage 247  
The coolant expansion tank and the engine oil  
filling opening may be located in different places  
within the engine compartment, depending on  
the engine version.  
1
2
Washer fluid reservoir () ðpage 252  
Jump start points: (+) under a cover, (-)  
ground point ðpage 251, Charging the 12  
volt vehicle battery ðpage 291, Jump start-  
ing  
3
4
5
Engine oil filler opening () ðpage 242,  
Checking the engine oil level  
Sticker for engine oil specifications  
ðpage 241  
Coolant expansion tank () (depending on  
the engine) ðpage 246  
240  
Checking and Filling  
Engine oil  
Tips  
Audi recommends using engine oils provided  
by Audi Genuine Parts.  
If the engine oil level is too low  
Messages  
The following messages may appear, depending  
on the vehicle equipment:  
Turn off engine. Oil pressure too low  
Stop driving and turn off the engine. Check the  
engine oil level ðpage 242.  
Fig. 161 Engine oil sticker  
If the engine oil level is too low, add engine oil  
ðpage 243. Only continue driving once the in-  
dicator light turns off.  
1 Engine oil viscosity  
2 Engine oil standard  
If the engine oil level is correct and the indica-  
tor light still turns on, turn the engine off and  
do not continue driving. See an authorized Audi  
dealer or authorized Audi Service Facility for as-  
sistance.  
If you need to add engine oil, use an oil that  
meets the engine oil standard listed on the stick-  
er ðfig. 161. The sticker with the specified  
standard is located in the front of the engine  
compartment ðpage 240, fig. 160. When using  
the specified engine oil, you can adjust the oil  
level as often as needed.  
Applies to: vehicles with oil level warning  
Please add oil immediately  
Stop driving and turn off the engine. Check the  
engine oil level ðpage 242 and add engine oil  
immediately ðpage 243.  
If engine oil that meets the recommended speci-  
fication is not available, in an emergency you  
may add a maximum of 0.5 quart (0.5 liter) en-  
gine oil of the that meets the following different  
standard one time until the next regular oil  
change.  
Please add max. x qt (x l) oil. You can contin-  
ue driving  
Add the amount of oil shown immediately  
Standard VW 504 00, ACEA C3, ACEA C4,  
API SP or ILSAC GF-6A. All viscosity classes  
within these standards are permitted.  
ðpage 243.  
Please reduce oil level  
Audi recommends having the oil changed by an  
authorized Audi dealer or authorized Audi Service  
Facility.  
There is too much oil in the engine and there is a  
risk of damaging the catalytic converter or en-  
gine. Drive to an authorized Audi dealer or au-  
thorized Audi Service Facility immediately to have  
engine oil extracted if necessary. Avoid high en-  
gine speeds, full acceleration, and heavy engine  
loads.  
Note  
Audi recommends using approved engine oil  
that meets the respective VW standard. Using  
engine oils which do not meet these quality  
standards can cause damage to the engine. As  
an exception and only in an emergency, 0.5 qt  
(0.5 l) of engine oil that differs from the  
standards listed may be used.  
Oil level sensor: oil change necessary. Please  
contact Service  
Fuel has entered the engine oil. This will cause  
the engine oil level to rise slowly and the engine  
oil quality to decrease. Do not extract engine oil  
to reduce the level, because this will increase the   
241  

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