OBD-II code · Body
B0103 Front Crash Sensor Left Communication Lost
Communication with the left front crash sensor has been lost; SRS deployment logic for frontal impacts is degraded.
Is it safe to drive with B0103?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen bus wiring
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.6–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Left Front Crash Sensor, Srs Bus
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.