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.
Here are your repair options, from cheapest to most involved.
The b173d Peugeot fault code is a minor, non-critical electrical issue that plagues the PSA platform. While it is annoying to see a warning light on your dashboard, the repair is straightforward and inexpensive when approached methodically.
Start with cleaning and checking the connector. Move to replacing the air quality sensor. Only then consider wiring or BSI updates. By following this guide, you should have your automatic climate control working flawlessly within an afternoon, saving yourself a costly trip to the dealership.
Have you fixed the b173d code on your Peugeot 208 or 308? Share your experience in the comments below to help fellow owners!
It seems you are asking for a review of the Peugeot "B173D" — however, no production Peugeot car model is named B173D.
Here is the most likely explanation, followed by a summary review of the actual vehicle you probably mean.
Use a diagnostic tool (such as Diagbox,
In the context of Peugeot and Citroën (PSA Group) vehicles, the fault code B173D is a diagnostic trouble code (DTC) that signifies a failure in identifying the mechanical or electronic key, or the remote control. Understanding Fault Code B173D
This code is categorized as a "Body" code, typically managed by the BSI (Built-in Systems Interface), which is the central control unit for the vehicle's electronic functions. When this fault is active, the vehicle's immobilizer system fails to recognize the authorized signal from the key fob, leading to several operational issues. Primary Symptoms:
Engine Non-Start: The engine may fail to crank or start because the immobilizer remains active.
Key Not Detected: A warning message such as "Key not detected" or "Electronic anti-theft faulty" may appear on the dashboard.
Intermittent Starting: The car might start occasionally but fail at other times, often during specific weather conditions or after the vehicle has been sitting.
Central Locking Issues: Difficulties locking or unlocking the vehicle remotely. Common Causes b173d peugeot
The failure to identify the key can stem from several localized or systemic issues:
Key Fob Battery: A weak or dead battery in the remote control is the most frequent cause.
Key Reader/Antenna: The internal antenna or the key reader unit (often located near the ignition or in the center console for hands-free systems) may be faulty or disconnected.
Electrical Interference: Proximity to other electronic devices or low vehicle battery voltage can disrupt the signal.
Wiring/BSI Communication: Corroded wiring or a software glitch in the BSI can prevent the key's ID from being correctly processed. Recommended Steps for Resolution
Replace the Key Fob Battery: This is the simplest and cheapest first step.
Try a Spare Key: If the car starts with a second key, the issue is isolated to the original key fob.
Check Vehicle Battery Voltage: Low voltage in the main car battery can cause "ghost" faults in the BSI. Ensure the battery is fully charged (typically above 12.7V when off).
Perform a BSI Reset: This "soft reset" of the car's computer can sometimes clear temporary communication glitches. A standard procedure involves disconnecting the battery following a specific sequence (e.g., waiting for the system to go to "sleep" before disconnecting).
Professional Diagnostic: If the above steps fail, use a dedicated diagnostic tool (like Diagbox) to check for deeper BSI or wiring faults.
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The B173D error code in Peugeot vehicles refers to a specific fault within the vehicle's electronic architecture, most commonly associated with the AdBlue (SCR) system or the Start-Stop (STT) battery management system. 🛠️ Understanding the B173D Code
In the PSA Group (Peugeot/Citroën) diagnostic framework, a "B" prefix denotes a Body or Chassis system fault. The B173D code typically triggers a "Service" light or an "Emissions Fault" warning on the dashboard. Primary Cause: The AdBlue System Before buying any parts, you need to understand
Most Peugeot diesel engines (BlueHDi) utilize Selective Catalytic Reduction (SCR) to meet Euro 6 emissions standards.
Sensor Misalignment: The code often indicates an issue with the AdBlue tank sensor.
Pump Failure: It can signal that the internal pump is failing to maintain pressure.
Crystalization: AdBlue fluid can crystallize in cold weather or if the vehicle is unused, clogging the injector and triggering this fault. ⚡ Secondary Cause: Energy Management
In some Peugeot models, B173D is linked to the Voltage Retention Device (VDR) or the "Battery Charge Status" module.
Start-Stop Logic: If the battery voltage is too low to support the Start-Stop system, the BSI (Built-in Systems Interface) throws this code.
Auxiliary Battery: Many Peugeots use a secondary capacitor or battery for the ECO mode; a failure here often registers as B173D. 🔍 Diagnostic and Repair Steps
Resolving this code requires a systematic approach using a Lexia or Diagbox tool, which is specific to Peugeot/Citroën. 1. Verification Check the AdBlue level. Inspect the battery health (SOH) and charging voltage. 2. Software Updates Peugeot frequently releases ECU firmware updates.
Updating the BSI or Denox (AdBlue) control unit often clears "ghost" codes. 3. Component Replacement
If the fault persists in the AdBlue system, the entire tank module often needs replacement, as the pump and sensors are usually sealed units.
If linked to the battery, replacing the main or auxiliary battery typically solves the issue. ⚠️ Potential Impact
Ignoring a B173D code related to emissions can eventually lead to a Non-Start countdown. Peugeot systems are programmed to prevent the engine from starting after a certain mileage (e.g., 700 miles) if the emissions fault is not rectified, to ensure environmental compliance. To help you narrow this down, could you tell me: What model and year is your Peugeot? Are you seeing a "Non-start in X miles" warning? Do you have any other fault codes (like P20E8 or U0028)?
Fault code B173D in Peugeot vehicles indicates a communication failure between the vehicle’s security system and the key. Specifically, it means the car is struggling to identify either the mechanical/electronic key or the hands-free remote control when it is in the reader. Symptoms and Causes Here are your repair options, from cheapest to most involved
This error typically affects the vehicle's immobilizer system, which may result in:
Starting Issues: The engine may fail to start or the dashboard may display a "key not detected" warning.
Security Lockouts: The immobilizer may remain active, preventing the engine management ECU from unlocking the vehicle for operation.
Root Causes: These often range from a weak key fob battery or a faulty internal transponder to issues with the reading antenna, wiring, or the Built-in Systems Interface (BSI). Recommended Troubleshooting Steps
Before pursuing expensive repairs, follow these common diagnostic steps:
Check the Key Fob: Replace the key fob battery and attempt to use a spare key to rule out a localized transponder failure.
Verify Battery Voltage: Low vehicle battery voltage can cause "ghost" electrical faults in Peugeot's sensitive electronics. Ensure the battery maintains roughly when the engine is off.
Perform a BSI Reset: Many electronic communication errors can be cleared by performing a "soft reboot" of the BSI module. This involves a specific sequence of disconnecting and reconnecting the battery.
Inspect the BPGA/Battery Protection Unit: On newer models like the 308 or 3008, a fault in the battery protection and management unit can mimic key recognition errors.
To fix this code, a mechanic or a confident DIYer will typically follow these steps:
Before spending money on parts, try resetting the BSI properly.
While rare, some technicians have reported that an incorrectly fitted or cheap aftermarket pollen filter can physically obstruct the internal air duct that houses the sensor’s pressure reference, leading to the code.
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.