B173d Peugeot Page

The code often indicates an issue with the AdBlue tank sensor.

The Peugeot BSI module suffers a temporary configuration memory loop or data corruption.

Always rule out your handheld hardware first. Replace the CR2032 or CR2020 coin cell inside your key fob shell with a fresh battery. If you have a spare key, use it to try and start the vehicle. If the car fires up using the second key, your primary key fob transponder chip or circuit board is damaged and requires replacement or resynchronization. Step 2: Use the Emergency Backup Slot b173d peugeot

The functions as the central gateway coordinator. Software bugs, water ingress from leaking windscreens, or incorrect vehicle configuration parameters (often flagged alongside code B2EA0 ) can cause communication drops across the immobiliser network. 🛠️ Step-by-Step Diagnostic & Troubleshooting Pathway

Lower the driver's window completely, pop open the bonnet, and turn off all electrical accessories (radio, lights, A/C). The code often indicates an issue with the

Reconnect the battery terminal tightly, then wait without touching any switches.

If the BSI reset doesn’t resolve the issue, check for power delivery problems: Replace the CR2032 or CR2020 coin cell inside

If a secondary key works fine, source a replacement key fob. If both keys fail simultaneously alongside a B1808 engine lock code, you are likely looking at a failing interior antenna module or a corrupted BSI configuration file that requires advanced dealer-level diagnostics.

The most debilitating symptom is a . Because the immobilizer system cannot verify that an authorized key is present, the BSI blocks the engine control unit (ECU) from engaging the starter motor or supplying fuel to the cylinders. 2. "Key Not Detected" Warning Messages