B173d Peugeot May 2026

Decoding the B173D Peugeot: Causes, Symptoms, and Fixes for the Cylinder 4 Glow Plug Circuit Fault

If you own a modern Peugeot equipped with a BlueHDi diesel engine, you may have recently been startled by the sudden illumination of the dreaded engine management light (often called the "orange anti-pollution light"). When you plug in an OBD2 scanner, the code that appears is often cryptic: B173D Peugeot.

• Repairing the Wiring: If a broken wire is found in the door harness, the wire can often be spliced and repaired. This is the most cost-effective solution.
• Cleaning Connectors: If corrosion is found, cleaning the connector pins with electrical contact cleaner and applying dielectric grease may resolve the issue.
• Replacing the Mirror Actuator: If the motor is seized, the internal mirror mechanism needs to be replaced. On some models, you can replace just the motor; on others, you may need to replace the entire mirror unit.
• Replacing the Door Loom: In severe cases where the wiring inside the door is badly damaged, a new door wiring loom may be required.

Step 3: The Resistance Test (Disconnect the harness). Unplug the electrical connector from the glow plug control unit and test each glow plug directly at the unit's connector pins. You need the pinout diagram for your specific Peugeot engine (DV6 or DW10). For cylinder 4, you should see approximately 0.6 to 1.2 Ohms.

3. Wiring or Connector Issues

PSA Group vehicles are known for corroded connectors, especially in lower bumper areas exposed to water spray. Broken wires, bent pins, or oxidation at the 3-pin connector are frequent culprits. b173d peugeot

Step 2 – Connector Check Unplug the sensor. Inspect the 3 pins. Are they green or white (corrosion)? Spray with electrical contact cleaner. Reconnect and clear the code. Does it return? If not, corrosion was the issue.

Decoding the b173d Peugeot: Symptoms, Causes, and Comprehensive Fix Guide

If you own a modern Peugeot (such as the 208, 308, 2008, 508, or RCZ) and a warning light has appeared on your dashboard, or your diagnostic scanner has pulled up the cryptic code b173d peugeot, you’re not alone. This specific manufacturer-specific code is a common headache for owners of the PSA Group (Peugeot-Citroën) vehicles. Decoding the B173D Peugeot: Causes, Symptoms, and Fixes

Replace the Key Battery: Start with the simplest fix by installing a fresh battery in your remote.

The b173d code indicates that the Body Control Module (BSI) or the Climate Control Unit is not receiving a valid signal from this sensor. Repairing the Wiring: If a broken wire is

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 Automatic Air Recirculation System has detected a fault in the air quality sensor (also known as the AQS or pollution sensor).