Oxygen sensor 1 — lambda / current

Last reviewed 2026-08-31

Mode 01 · PID 34 (decimal 52)

Description

Wide-range O2 sensor 1: lambda and pump current.

PID number

34 · 52

Unit

ratio / mA

Range

0 … 2

Data bytes

4

Formula

(2/65536)*((A*256)+B) ; ((C*256)+D)/256-128

• 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.