B00C4Passenger Seat Occupant Classification Sensor E
- Generic OBD-II code · Body
- How the car detects it
- B00C4 stands for the fifth and last passenger seat classification input; no public carmaker source uses it. Two field cases show what goes wrong besides wiring. Mazda found on 2016–2019 models that a phone, tablet or laptop lying on an empty passenger seat could make the system see a person: the passenger belt warning came on while PASS AIRBAG OFF stayed dark, and the advice was simply to keep devices off the seat. Land Rover quarantined 2025 Range Rover Sport SV cars because the OCS modules had been calibrated with the wrong weight, so the bag might not be switched off for a child seat as FMVSS 208 demands; new modules took 1.1 h. Calibration and plausibility therefore matter as much as the sensor. With B00C4 stored, the airbag lamp is lit and E is not trusted.
- What you may notice
- Airbag warning lamp on
- Passenger belt warning or airbag status lamp does not match who or what is on the seat
- Safety note: passenger airbag may stay enabled for a child seat; disconnect only de-energised, calibrate with the maker's procedure after any module change, specialist workshop only
- Likely causes
- PossibleClassification module calibrated wrongly or not at all after replacement
- PossibleOpen or high-resistance contact on the lead to input E
- RareElectronic devices or other objects on the seat confusing the sensing
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.