Depending on the specific model year and software version (DiagBox or PP2000), the full description may vary slightly, but the core issue remains the same: The has detected a fault in the air quality sensor (also known as the AQS or pollution sensor). How the System Should Work Modern Peugeots are equipped with an automatic climate control system. When you set the HVAC to "Auto," the system monitors outside air quality. If the sensor detects high levels of pollutants (diesel fumes, CO, NOx), it automatically switches the ventilation from fresh air to recirculation mode to protect the cabin occupants.
Have you fixed the b173d code on your Peugeot 208 or 308? Share your experience in the comments below to help fellow owners! b173d peugeot
A: Check the wiring harness for a short to ground. Also, ensure you bought the correct sensor. Some Peugeots have different sensors for dual-zone vs. manual A/C. Finally, perform a BSI hard reset (disconnect battery for 30 minutes, touch leads together, then reconnect). Final Verdict: Don’t Fear the b173d Peugeot Code The b173d Peugeot fault code is a minor, non-critical electrical issue that plagues the PSA platform. While it is annoying to see a warning light on your dashboard, the repair is straightforward and inexpensive when approached methodically. Depending on the specific model year and software
In this extensive guide, we will break down exactly what code b173d means, its most common causes, how to diagnose it step-by-step, and the most effective repair strategies. Let’s cut through the technical jargon. In plain English, b173d Peugeot translates to: "Air Quality Sensor - Circuit Malfunction" or sometimes listed as "Ambient Air Quality Sensor / Pollen Filter Sensor Signal Incorrect." If the sensor detects high levels of pollutants