Where is the Audi A4 air conditioning pressure sensor located?

[SanHeidi]

Audi A4 air conditioning pressure sensor is located on the air conditioning pump. Below is relevant information about the sensors: 1. Interior temperature sensor: Usually installed under the instrument panel, it is a thermistor-type temperature sensor with negative temperature coefficient characteristics, used to provide the air conditioning electronic control unit with temperature signals from inside the vehicle cabin. 2. Exterior ambient temperature sensor: The exterior ambient temperature sensor is also a thermistor-type temperature sensor with negative temperature coefficient characteristics, typically installed on the lower side of the vehicle's front bumper, used to provide the air conditioning electronic control unit with temperature signals from outside the vehicle cabin.

[ORuth]

I've been driving an Audi A4 for over 10 years. The air conditioning pressure sensor is usually hidden in the engine compartment, especially near the AC compressor. That small black box is fixed on the high-pressure or low-pressure pipeline, with an electrical connector attached nearby. The sensor monitors pressure to protect the system. If it fails, the AC may stop cooling or fluctuate between hot and cold. Once when my A4's AC had issues, it turned out to be the culprit. It's located near the compressor on the right side of the engine bay—just unscrew the cover to see it, but don't attempt DIY removal as refrigerants (like R134a) are hazardous and require professional tools for evacuation. I recommend checking this area during routine maintenance to ensure the wiring connectors aren't loose. Although its location is obvious, it's safer to have it handled at an authorized 4S shop.

[SanTessa]

I've been playing with car modifications for two or three years. The pressure sensor of an Audi A4 is usually clamped on the high-pressure side of the air conditioning pipeline, commonly located at the compressor outlet or condenser inlet. This sensor monitors system pressure to prevent explosions. If it fails, it can lead to cooling failure or trigger a fault light. The position varies by model; for example, the 2018 version is located at the pipeline connection on the front left side of the engine bay. When inspecting, open the hood and look for a black casing attached to a metal pipe, making sure not to loosen the wiring. Beginners can learn to use a multimeter to measure resistance and confirm the issue, but remember to wear gloves before operating, as refrigerant can harm the skin. Regularly check for aging wiring and avoid water ingress to prevent rust.

[McLeo]

Our family usually drives an Audi A4 to take the kids to school. The air conditioning pressure sensor is located in the engine compartment, typically on the pipe near the compressor. This small device measures pressure for safety, and if it fails, the AC can suddenly stop cooling, which is unbearable in the summer. When looking for it, open the hood and check the pipe connections on the right or front—the small black box with wires is the sensor. Never try to touch it yourself, as it might leak harmful chemicals and cause health issues. Last time, my husband took it to the repair shop for replacement, saying it's easy to locate but tricky to handle. It's best to have a mechanic check it during winter maintenance to avoid any inconvenience.