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B173d Peugeot |best| -

Peugeot B173D — Overview, Specs, and Common Issues

The B173D is a diesel engine code used in some Peugeot models (notably older 1.9–2.0L diesel variants). Below is a concise, structured article covering what it is, specifications, maintenance tips, and common faults.

Theories and Speculations

  1. Persistent Check Engine or Service Light: The amber engine/Service light illuminates and stays on. In some models, a message like "Air Quality Fault" appears on the central display.
  2. Manual Recirculation Only: You can manually press the recirculation button, but the car never switches to recirc automatically, even behind a smoky truck.
  3. Musty or External Smells Entering Cabin: Since the system fails to close the fresh air flap, exhaust fumes, dust, and odors enter the cabin freely.
  4. Error Code Storage: The fault is stored in the BSI. If cleared, it often returns immediately or within one driving cycle.
  5. Potential Parasitic Battery Drain (rare): If the sensor has internally shorted, it can keep the BSI network active, slowly draining the battery overnight.

No Start: The engine may fail to crank or start because the immobilizer is active. b173d peugeot

The Old Way: 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. Peugeot B173D — Overview, Specs, and Common Issues

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. A warning light on the dashboard indicating a

Vehicle Battery Issues: In Peugeot models (like the 308 or 5008), an old or undercharged car battery can cause the BSI to throw multiple "ghost" codes, including B173D, as it tries to conserve power .

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