Diesel exhaust fluid sensor data
Last reviewed 2026-08-31
Mode 01 · PID 9B (decimal 155)
Description
DEF/AdBlue sensor data. Example: byte D scaled 100/255 is concentration/level.
- PID number
- 9B · 155
- Unit
- %
- Range
- —
- Data bytes
- 4
- Formula
- 100/255*D (example)
- Also valid as Mode 02 freeze-frame data (same PID number, snapshot at last DTC).
Defined by SAE J1979 / ISO 15031-5. Public index — not a substitute for the paid SAE document.
Sources
Provenance for this page. Official standards outrank community notes. See the confidence policy.
Official standard · high trust
SAE J1979 / ISO 15031-5 Mode 01 PID formulas (public index)
J1979 public PID index: 01 9B