Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

Reason for the air conditioner not working on an Audi A3/S3 8P.

Model: Audi A3 MK 2, 8P - Years 2003-2013
Part: Air conditioner

The problem presented is a common issue with the air conditioning system of the Audi A3/S3 8P, but it is specific to the 1.6 or 2.0 TSI engine. The sensor may be positioned differently on a 1.9 TDI. When unscrewing the sensor, some refrigerant gas should escape, and after replacement, the system needs to be recharged with the correct amount of oil and refrigerant gas. Therefore, if our system is empty, simply replacing the sensor will not solve the problem. Using an OBD2 reader, we look for error code 00819, and in this case, it will be necessary to purchase the correct replacement part, which is Audi part number 8E0 959 126. The system must be evacuated, and it is advisable to have this done by a professional, as the fluid should not be released into the environment. We replace the sensor following the instructions in the video (disconnecting the battery before unplugging the sensor's electrical connector). After that, the system must be purged of air, the vacuum tightness must be checked, and then it should be recharged with the exact amount of R134A gas (approximately 525 grams (+/- 25 grams) and PAG oil).

Posted on 20 December 2025 by ScegliAuto

Video tutorial

Related tutorials

How to synchronize the air conditioning system of the Audi A3
How to synchronize the air conditioning system of the Audi A3
Audi A3 (2003-2013 / MK 2, 8P) The air conditioning system of the Audi A3 model 8P allows for independent use of the air conditioning; in fact, by turning the knobs, it is possible…
Setting the Time and Date on an Audi A3
Setting the Time and Date on an Audi A3
Audi A3 (2003-2013 / MK 2, 8P) Today, I will show you a really simple procedure that not everyone knows: setting the time and date on an Audi A3 8P (the model produced from 2003 to…
What to Do If the Interior Rear-View Mirror Falls on an Audi A3 8P
What to Do If the Interior Rear-View Mirror Falls on an Audi A3 8P
Audi A3 (2003-2013 / MK 2, 8P) Let’s see what happens if the interior rear-view mirror of a vehicle falls inside: in this case, it’s an Audi A3, but the method applies to all vehic…

Other guides you may be interested in

How to Reset the Central Locking of the Volkswagen Golf 4?

If the central locking system of the Volkswagen Golf 4 is not working, it is likely necessary to reset the system: to do this, open the driver's door and detach the side panel of the dashboard next to the steering wheel. Under this panel, you will find the fuses, including the one for the central locking, which is indicated in the manual as number 14. To reset the system, remove this fuse from its housing, then reinsert it or replace it with a new one of the same amperage: this will reset the central locking system.

Watch the video!


by ScegliAuto

More videos