NOx reagent system
Last reviewed 2026-08-31
Mode 01 · PID 85 (decimal 133)
Description
NOx reagent (DEF/AdBlue) system. Example: byte F scaled 100/255 is reagent level.
- PID number
- 85 · 133
- Unit
- %
- Range
- —
- Data bytes
- 10
- Formula
- 100/255*F (reagent level 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 85