Disclaimer: This article is for informational purposes only. Always consult your vehicle's service manual and follow safety procedures. Torque specifications vary by engine code (DV6C, DV6D, DW10).
Key Present inside the Reader: (Should toggle between Yes/No) Key Label Recognised: (Should display Valid or Confirmed) Immobiliser Status: (Locked vs Unlocked)
A weak CR2032 internal cell degrades the high-frequency RF signal used for proximity locking and transponder validation. Alternatively, aftermarket USB chargers or radar detectors plugged into the 12V socket can emit electromagnetic fields that block the transponder signal. Electrical circuit fault: have your vehicle repaired
to clear the code and see if it returns immediately, which would indicate a hardware failure in the transponder or BSI. b173d peugeot
: A persistent notification or visual warning icon displayed on the instrument cluster dashboard.
The sensor itself is an electromechanical component that heats an element to detect pollutants. Over time (typically 5-8 years), the sensing element burns out or becomes contaminated with oil or road grime. This is the number one cause of the b173d Peugeot code.
Disclaimer: Diagnostic codes should be interpreted by qualified technicians. The information above is for informational purposes based on available diagnostic reports. If you'd like, I can: Disclaimer: This article is for informational purposes only
The "story" of in a Peugeot is essentially a tale of a car that has forgotten its owner . In technical terms, B173D is a diagnostic fault code that indicates a failure to identify the mechanical/electronic key or the remote control [25]. What happens to the car?
The most common cause. Glow plugs have a heating element that expands and contracts thousands of times. Eventually, the tip breaks or the internal coil melts. When you test the resistance of a healthy glow plug, it should read between . A failed plug will read "OL" (Over Limit) or infinite resistance.
. This error is logged directly by the vehicle's Built-in Systems Interface (BSI)—the primary central computer managing the vehicle's cabin electronics, security, and convenience networks. When this code triggers, the BSI fails to securely verify the encrypted transponder data from your key fob, classifying the attempt as an unauthorized start or an open communication loop. Technical Definition & Code Breakdown Key Present inside the Reader: (Should toggle between
It sounds simple, but a fresh CR2032 (or similar) battery fixes a significant percentage of B173D errors. After replacing it, you may need to re-sync the key by putting it in the ignition, turning to position 2, and holding the lock button for 10 seconds.
When the B173D code becomes active, you will generally notice one or more of the following security and electrical symptoms: 1. The Engine Will Not Start
If you need help narrowing down your diagnosis, feel free to share:
Before buying any parts, you need to understand that the glow plug itself is only one piece of the puzzle. The B173D code indicates an electrical circuit fault. Here are the six primary causes, ranked from most to least common.
This is the #1 cause of B173D in Peugeots. If the battery was disconnected or replaced recently without following the correct "Sleep Mode" procedure, the BSI can lose its configuration or corrupt the data handshake with other modules.