Lamp Fault Codes (LFCs)
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The following Lamp Fault Code (LFC) indicates the specific fault associated with DTC B1921:
| LFC | Description |
|---|---|
| 1-4 | Air Bag Diagnostic Monitor Ground Circuit Open |
WARNING:
Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.
NOTE:
A resistance difference as low as 10 ohms may set the LFC.