Get Checking and Filling -> Refueling Guide for Audi A5 4 Door Third Generation (2025-2026)

Checking and Filling

mixtures different from those specified.

This type of damage also does not fall under

the New Vehicle Limited Warranty or under

the emissions control system warranty.

– If you notice a higher fuel consumption or

poor handling or performance problems due

to such gasoline mixtures, Audi recom-

mends fueling with unblended gasoline.

There is a malfunction in the fuel tank system.

Drive to an authorized Audi dealer or authorized

Audi Service Facility immediately to have the

malfunction corrected.

Fueling procedure

Gasoline additives

An important issue for many automobile manu-

facturers is combustion residue in the engine

that results from the use of certain fuels.

Although types of gasoline differ depending on

the manufacturer, there are similarities. Certain

substances in the gasoline may cause deposits in

the engine. Additives in the gasoline that should

keep the engine and fuel system clean do not all

function equally.

Fig. 156 Right rear side of the vehicle: opening the fuel

filler door

Audi recommends using TOP TIER Detergent Gas-

oline. For additional information on TOP TIER De-

tergent Gasoline, visit www.toptiergas.com.

If you use incorrect fuels over a long period of

time, the maximum engine performance may be

impaired by combustion residue.

Fig. 157 Fuel filler door with attached fuel cap

Note

The fuel filler door is unlocked or locked by the

central locking system.

– Damage or malfunctions caused by the use

of incorrect types of gasoline are not cov-

ered by the New Vehicle Limited Warranty.

– Only gasoline additives that have been ap-

proved by Audi may be used.

►

Unlock the vehicle if necessary.

►

Press on the left side of the fuel filler door to

open it ðfig. 156.

►

Unscrew the tank cap counterclockwise.

Place the cap from above on the open fuel filler

door ðfig. 157.

Insert the fuel pump nozzle all the way into the

fuel filler neck.

Begin fueling. Once the fuel pump nozzle turns

off the first time, the fuel tank is full. Do not

continue fueling, or else the expansion space in

the tank will be filled with fuel.

After the fuel pump has turned off, wait five

seconds before removing the nozzle to allow

the rest of the fuel to finish dripping into the

fuel tank.

Refueling

Messages

►

The following messages may appear, depending

on the vehicle equipment:

Messages

If the  indicator light appears with a corre-

sponding message, refuel the vehicle.

►

 Tank system: malfunction! Please contact

Service



235

Checking and Filling

►

Turn the fuel cap clockwise until it clicks into

place.

Close the fuel filler door and then press on the

left side until it latches.

ing an accident. This can cause explosions,

fires, and injuries.

►

– If you must transport fuel in a fuel contain-

er, note the following:

– Always place the fuel container on the

ground before filling. Never fill the fuel

container with fuel while it is inside or on

the vehicle. Electrostatic discharge can oc-

cur while refueling and the fuel vapors

could ignite.

The correct fuel type for your vehicle can be

found on a label located on the inside of the fuel

filler door. For additional information on fuel, see

ðpage 234.

For the tank capacity in your vehicle, refer to the

Technical Data ðpage 308.

– When using fuel containers made of met-

al, the fuel pump nozzle must always re-

main in contact with the container to re-

duce the risk of static charge.

To reduce the risk of fuel leaking out or vapors

escaping, make sure that the fuel tank is closed

¹⁾

correctly. Otherwise the

turn on.

indicator light will

– Insert the fuel pump nozzle as far as possi-

ble into the filler opening while refueling.

– Follow the applicable legal regulations in

the country where you are driving when

using, storing and transporting fuel con-

tainers.

WARNING

Improper fueling procedures and improper

handling of fuel can result in explosions, fires,

severe burns, and other injuries.

– Make sure that the fuel container meets

the industry standards, for example ANSI

or ASTM F852-86.

– Do not smoke. Keep away from open flames.

– The ignition must be turned off when refuel-

ing.

– Mobile devices, radio devices, and other ra-

dio equipment should always be turned off

when refueling. Electromagnetic rays could

cause sparks and start a fire.

Note

– Remove fuel that has overflowed onto any

vehicle components immediately to reduce

the risk of damage to the vehicle.

– If you do not insert the fuel pump nozzle all

the way into the filler tube, then fuel can

leak out. Spilled fuel can ignite and start a

fire.

– Never drive until the fuel tank is completely

empty. The irregular supply of fuel that re-

sults from that can cause engine misfires.

Uncombusted fuel may enter the exhaust

system and increase the risk of damage to

the catalytic converter.

– Never get into the vehicle when refueling. If

there is an exceptional situation where you

must enter the vehicle, close the door and

touch a metal surface before touching the

fuel pump nozzle again. This will reduce the

risk of electrostatic discharge that can cause

flying sparks. Sparks can start a fire when

refueling.

For the sake of the environment

– Do not overfill the fuel tank, or fuel could

leak out when the vehicle is warming up.

– Fuel should never enter the sewer system or

come into contact with the ground.

WARNING

Tips

Audi does not recommend transporting fuel

containers inside the vehicle. Fuel could leak

out of the container and ignite, especially dur-

The fuel filler door on your vehicle does not

lock if you lock the vehicle from the inside us-

ing the central locking switch.

Depending on the engine and country

236

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-

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.



Depending on the engine and country

237

Checking and Filling -> Refueling for Your Audi A5 4 Door Third Generation (2025-2026)

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