B173d Peugeot Jun 2026

Connect the sensor. Back-probe the signal wire. In clean air, the voltage should be around 1.5V to 2.5V. Spray a small amount of cigarette smoke or a solvent-based brake cleaner near the sensor – the voltage should jump to near 5V. If it doesn’t change, the sensor is dead.

If both keys fail and throw code B173D, the problem lies within the car's internal receiving network. Step 3: Perform a Full BSI Hard Reset

. This is a manufacturer-specific code generated by the Built-in Systems Interface (BSI) when it fails to communicate with or verify the transponder in your key. The Automotive Technician Common Symptoms Intermittent Non-Start : The car may fail to start on the first few attempts. Key Recognition Failure

Proximity systems always have an emergency override backup spot. This is usually a physical slot in the dashboard or a designated target emblem on the steering column shroud. b173d peugeot

; frequently leads to intermittent or permanent vehicle non-start situations. Commonly Paired Codes

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 , you’re not alone. This specific manufacturer-specific code is a common headache for owners of the PSA Group (Peugeot-Citroën) vehicles.

A "BSI Reset" is similar to restarting a computer and can clear intermittent electronic faults. Connect the sensor

Reach through the open driver’s window and switch on the sidelights to gently wake up the central system.

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: Use a dedicated diagnostic tool like Diagbox to read the specific BSI logs and clear the codes once the hardware issue is fixed . AI responses may include mistakes. Learn more Spray a small amount of cigarette smoke or

This diagnostic code is highly prevalent in modern Peugeot vehicles equipped with smart key or hands-free proximity systems, including the . Technical Definition of B173D

If your Peugeot records this code in its BSI memory logs, you will likely experience one or more of the following symptoms:

The engine does not start, or you receive a "Key Not Detected" message on the dashboard, even if the key is inside the car.

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

However, don’t ignore the code indefinitely. If it’s accompanied by the B1808 immobilizer code, your car may refuse to start at the worst possible moment. A few hours of methodical diagnostics now can save you from a tow truck call and a hefty repair bill later.