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DTC codes / B00xx · Airbags, seats, doors, lights and comfort systems / B0098

B0098Occupant Detection Sensor

B0098 indicates that the occupant detection sensor, which is part of the passenger seat weight-sensing system, has reported a fault to the restraint control module. The computer has detected an abnormal signal or circuit condition from the sensor, which may prevent the passenger airbag from deploying correctly in a crash.

SystemBody
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

  • Airbag warning light illuminated on the dashboard
  • Passenger airbag status indicator may show 'off' even when the seat is occupied
  • Often no symptoms besides the warning light
  • In some vehicles, a chime or message may appear reminding you to check the airbag system
  • The passenger airbag may be disabled entirely, which you might notice if the status light stays off

Common causes, most likely first

  1. Faulty occupant detection sensor (weight sensor) in the passenger seat
  2. Damaged or pinched wiring under the passenger seat
  3. Loose or corroded electrical connector at the sensor or control module
  4. Failed occupant detection control module (if equipped separately)
  5. Seat cushion damage or foreign object interfering with the sensor
  6. Water intrusion or spill damage to the sensor or wiring

How to diagnose and fix it

  1. Inspect the wiring and connectors under the passenger seat for damage or corrosion, and repair as needed
  2. Check for any objects or debris under the seat that could interfere with the sensor
  3. Perform a visual inspection of the seat cushion and sensor for signs of damage or wear
  4. Use a scan tool to read live data from the occupant detection sensor and compare with expected values
  5. Calibrate or re-zero the occupant detection system according to the manufacturer's procedure
  6. Replace the occupant detection sensor if testing confirms it is faulty
  7. Clear the code and verify the repair by cycling the ignition and checking that the light stays off

Common misdiagnosis of occupant sensor faults

  • A weak or failing battery can cause voltage drops that trigger false occupant sensor codes, so always check battery health first.
  • The occupant detection sensor is often part of the seat cushion and may require seat disassembly, which is why many technicians misdiagnose it as a simple wiring issue.
  • After replacing the sensor, some vehicles require a recalibration procedure that is not always documented in aftermarket manuals, leading to repeat codes.
  • The code can be set by a loose connector that only loses contact when the seat is moved, so wiggle-testing the harness while monitoring live data is crucial.
  • Do not assume the sensor is bad just because the code is present; the fault could be in the wiring or the control module, and misdiagnosis leads to unnecessary parts replacement.

Can I keep driving with B0098?

You can generally drive with this code, but the passenger airbag may not deploy in a crash, so avoid carrying a passenger in the front seat until the fault is repaired. Have the system diagnosed promptly to restore full safety functionality.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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