Oxygen sensor 2 — lambda / voltage
Last reviewed 2026-08-31
Mode 01 · PID 25 (decimal 37)
Description
Wide-range O2 sensor 2, same layout as PID 24.
- PID number
- 25 · 37
- Unit
- ratio / V
- Range
- 0 … 2
- Data bytes
- 4
- Formula
- (2/65536)*((A*256)+B) ; (8/65536)*((C*256)+D)
- 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 25