Headlight Auto-Leveling Sensor Circuit Fault
The B0074 code means the vehicle's onboard diagnostic system has detected: Headlight Auto-Leveling Sensor Circuit Fault. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $80 - $400 (parts and labor)
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Common Symptoms
- Leveling warning on dashboard
- Headlights stuck at one angle
- Beam does not change with load
- Height sensor diagnostic codes
Probable Causes (Ranked by Likelihood)
- Failed ride height sensor Very High
- Corroded sensor connector High
- Bent sensor linkage arm Moderate
- Wiring damage to leveling ECU Low
Step-by-Step Diagnostic Procedure
-
Test sensor output with scan tool
-
Inspect linkage for damage
-
Check connector for corrosion
-
Measure signal through full range
Frequently Asked Questions
Where are ride height sensors?
Near the rear suspension, connected to the control arm by a linkage.
Can a pothole damage the sensor?
Yes, potholes can bend or break the sensor linkage arm.
Does this affect suspension?
No, this sensor only provides input to the headlight leveling system.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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