B173d Peugeot Extra Quality -

Encountering the B173D fault code often manifests through one or more noticeable symptoms. The most frequent signs include:

The simplest cause. If the signal is too weak, the reader near the ignition barrel or in the cabin can't "handshake" with the key.

If you have a spare key, test its operation. If the spare key works consistently, it strongly suggests a problem with the primary key fob. If both keys exhibit the same issue, it points to a problem with the vehicle's BSI system.

: Difficulties locking or unlocking the vehicle remotely. Common Causes

The B173D Peugeot error code is a manufacturer-specific code that refers to a problem with the vehicle's electrical system. Specifically, it relates to a fault in the "Passenger Seat Belt Not Fastened" signal. This code is usually accompanied by a warning light on the dashboard, indicating that there's an issue with the seat belt system. b173d peugeot

In Peugeot and Citroën (PSA Group) architecture, codes starting with "B" refer to the Body domain, which is managed primarily by the BSI module.

A: No. AdBlue (SCR) is for NOx reduction. Glow plugs (B173D) are for combustion stability. However, a failed DPF caused by B173D can eventually clog the AdBlue injector.

Modern keyless systems work on radio frequencies. Other electronics (nearby radio masts, dashcams, or other smart keys) can interfere with the signal.

Perform a manual key sync. For many Peugeot models, this involves inserting the mechanical key into the ignition switch, turning it to the 'On' position, and immediately holding down the locking button on the remote for 10 seconds. Step 2: Validate System Voltage Encountering the B173D fault code often manifests through

Indicates power delivery to structural ignition circuits was cut short, starving key-reader modules. Driver's door presence detection error.

When the BSI cannot authenticate the remote, drivers will typically notice several operational failures:

The error usually logs a sub-code attribute (such as ), signaling that the module detected an incorrect, un-synchronized, or completely absent data package during an ignition ON or vehicle start request. Common Symptoms of Code B173D

If the physical reader in the dashboard is faulty, it must be replaced. If you have a spare key, test its operation

Disclaimer: This information is for educational purposes based on common Peugeot diagnostic patterns. Always consult a certified mechanic.

Your Peugeot is a finely tuned machine with complex electronics working behind the scenes. When the BSI can’t identify your key, it’s usually because something small — a fuse, a battery, a ground connection — has failed. Find that small thing, and you’ll find your solution.

In very rare cases (mostly Peugeot 308 and 508 models from 2015-2017), a software glitch causes the ECU to misdiagnose a healthy glow plug. A dealer software update resolves this.

Use a digital multimeter to measure your primary car battery across its terminals. A healthy, resting battery must register at least . If the battery reads below 12.2 volts, the BSI may experience communication dropouts when looking for the key transponder. Replace the battery if it fails a load test. Step 5: Inspect Key Reader and Antenna Wiring

In older diesels, glow plugs only activated for 10–30 seconds before starting the engine to heat the combustion chamber. Once the engine was running, the glow plugs turned off.

Accessory Protection and Management Unit Central Switch Positive Relay Fault.