OBD LensOBD Lens App
Diagnostic knowledge / Citroen O2 S2 Fuel trim — Enhanced PID
Citroen / Enhanced diagnostic signal

O2 S2 Fuel trim

Fuel trim is a reported correction to fuel delivery relative to a control-system reference. The name “O2 S2 Fuel trim” identifies the particular trim in this profile. Check its bank, time scale and sign convention before comparing percentages or diagnosing a lean/rich condition.

Signal definition and scope

Brand context
Citroen
Display unit
%
Signal kind
decoded signal
Source signal reference
13785013
Short label
O2 S2 Fuel trim
Library state
Decoded definition available; vehicle response not established
Source revisions
legacy-owner-2026-10-02-v59

Enhanced or private PID means a manufacturer-specific signal reference. It does not mean a paid PID. Request commands and decoding formulas are not needed to read this explanation and are not published here.

Which vehicle profiles list this signal?

1 connection profiles list this signal concept. Check the definition variants below for the exact profile relationships; matching display names do not make request or decoder variants interchangeable.

How should I interpret a value?

Use the exact vehicle profile and confirm the returned module and unit. An unavailable response is not zero. This reference does not supply a universal normal range or infer a failed component.

Inspect a recorded signal

Definition variants and exact profile relationships

Entries sharing a label and unit can use different requests or decoders. The following variants are retained separately; they are not interchangeable.

pid-309828317bfef4d318b00b38 · 1 profiles · runtime-ready
Source and applicability

OBD Lens production library legacy-owner-2026-10-09-v81. This is a scoped technical reference, not a scan of your car. A catalog relationship does not certify that every ECU, year or engine returns the same signal or code definition.

Read the reference method

OBD Lens reference library · catalog legacy-owner-2026-10-09-v81. Sources and scope