Long term secondary O2 trim — Bank 1 / 3
Last reviewed 2026-08-31
Mode 01 · PID 56 (decimal 86)
Description
Long-term secondary oxygen-sensor trim banks 1 and 3. Same scale as PID 55.
- PID number
- 56 · 86
- Unit
- %
- Range
- -100 … 99.2
- Data bytes
- 2
- Formula
- (A*100/128)-100 ; (B*100/128)-100
- 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 56