Audi A4: Emissions control system
General information
WARNING
The temperature of the exhaust system is high, both when driving and after stopping the engine.
- 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 system could start a fire.
- Do not apply underbody protectant in the exhaust system area, because this increases the risk of fire.
Catalytic converter
Observe the safety precautions General information.
The vehicle may only be driven with unleaded gasoline, or the catalytic converter will be destroyed.
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.
Malfunction Indicator Lamp (MIL)
If the .png)
indicator light blinks
or turns on, there
is a malfunction that is causing poor emissions
quality and that could damage the catalytic converter.
Drive slowly to an authorized Audi dealer or authorized Audi Service Facility to have the malfunction corrected.
The indicator light can also turn on if the fuel filler cap is not closed correctly.
READ NEXT:
Motor compartment
General information
Special care is required if you are working in the
motor compartment
For work in the motor compartment, such as
checking and filling fluids, there is a risk of injury,
scalding, ac
Engine oil
If the engine oil level too low
If you need to add engine oil, use an oil that is listed on the sticker. The
sticker is located at the front of the engine compartment fig. 158. When using
the engine
Cooling system
Coolant
The engine cooling system is filled with a mixture
of purified water and coolant additive at the factory.
This coolant must not be not changed.
The coolant level is monitored using the
indi
SEE MORE:
Software update
Introduction
Applies to: vehicles with software update
You can update your vehicle's software.
The functions depend on the country and vehicle
equipment:
Update through the online system update
Map material update for the navigation system
Have the software update performed by an authorized
Aud
Compressor, Replacing without the Need for Flushing Refrigerant Circuit
Note
Cleaning the refrigerant circuit means flushing with
refrigerant R134a. Refer to
→ Chapter "Refrigerant Circuit, Cleaning (Flushing), with
Refrigerant R134a".
If a faulty A/C compressor is replaced with an A/C
compressor from another manufacturer check for the A/C
compres
