What does it mean?
B1907 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Front sensor signal fault .
Symptoms
- Air bag warning lamp on and stays lit with the engine running
- Front air bags and pretensioners disabled while the fault is present, so they may not deploy in a collision
- Fault often appears shortly after minor front end damage or after front end repair work
- Warning message about the restraint system on the driver display
- Code may be intermittent, coming back over rough roads
Likely causes
- Front impact sensor damaged by a minor front end knock, kerb strike or road debris
- Sensor mounting bolt loose or the bracket bent, so the sensor cannot read deceleration correctly
- Corroded connector at the sensor, which sits in a wet area behind the bumper or on the radiator support
- Harness chafed or pulled where it runs across the front panel or through a grommet
- Water intrusion into the connector after a washer bottle leak or driving through standing water
- Sensor replaced with a wrong part number or a previously deployed unit
- Restraint control module internal fault or a poor module ground
How to fix it
- Follow air bag safety procedure: ignition off, battery disconnected and the specified stand time completed before touching any restraint connector
- Read all restraint codes with freeze frame and ask about any recent front end impact or repair
- Inspect both front impact sensors and their brackets for cracks, bending, corrosion and impact marks
- Check the mounting bolts are present and tightened to specification, as a loose sensor cannot report correctly
- Unplug the sensor connector and check for water, corrosion, bent pins and a properly engaged lock
- Compare the two front sensors in scan tool data where the system provides sensor status
- Consider the restraint control module last, after wiring, ground and sensor mounting have all been verified