The sensor receives a 12V or 5V reference from the BSI. A blown fuse in the engine bay fuse box (often F11 or F18, check your manual) can cause this code. Additionally, a BSI that needs a software reset can report false codes.

To understand this fault, you must first forget everything you know about old diesel engines.

The part number for the is typically 6441.C8 or 6441.C6 (always verify with your VIN). Generic OEM brands like Valeo, Hella, or Meyle produce reliable units for half the dealer price.

: A worn-out car battery can cause "phantom" faults across multiple systems, including the key recognition circuit. Troubleshooting Steps

If the spare works, the problem is likely with your primary key's hardware. Perform a BSI Reset (Soft Reboot): Open the driver's window and ensure all doors are closed. Switch off the ignition and remove the key.

: The car might start occasionally but fail at other times, often during specific weather conditions or after the vehicle has been sitting.

In the automotive world, fault codes are used to identify specific issues with a vehicle's systems. These codes are generated by the vehicle's onboard computer, known as the Engine Control Unit (ECU). When a problem arises, the ECU logs a code, which can then be retrieved using specialized diagnostic equipment. The B173D code seems to be related to a specific problem, but without further context, it's difficult to pinpoint the exact nature of the issue.

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