2025-2026 Audi A5 4 Door Checking and Filling -> Emissions control system User Manual
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Checking and Filling -> Emissions control system 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  

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