Let’s cut through the technical jargon. In plain English, translates to: "Air Quality Sensor - Circuit Malfunction" or sometimes listed as "Ambient Air Quality Sensor / Pollen Filter Sensor Signal Incorrect."
While this code can appear in any modern Peugeot, it is most frequently reported in: b173d peugeot
While rare, some technicians have reported that an incorrectly fitted or cheap aftermarket pollen filter can physically obstruct the internal air duct that houses the sensor’s pressure reference, leading to the code. Let’s cut through the technical jargon
Here is a breakdown of what this code means and how to address it. b173d peugeot