Maximum values: lambda, O2 voltage, O2 current, MAP

Last reviewed 2026-08-31

Mode 01 · PID 4F (decimal 79)

Description

Calibration maxima for equivalence ratio (A), oxygen sensor voltage (B), current (C), and MAP (D×10 kPa).

PID number

4F · 79

Unit

ratio, V, mA, kPa

Range

0 … 255

Data bytes

4

Formula

A ; B ; C ; D*10

• 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.