# Post Catalyst Fuel Trim Via Oxygen Sensor System Too Lean Bank 1

Source: https://obdlens.com/codes/p114b/
Last built: 7508d481ba6c398f25ed

[Diagnostic knowledge](https://obdlens.com/knowledge/) / P114B — Post Catalyst Fuel Trim Via Oxygen Sensor System Too Lean Bank 1

P114B

P114B is described as “Post Catalyst Fuel Trim Via Oxygen Sensor System Too Lean Bank 1” in the Generic OBD2 reference. 

Some scan tools (for example GM and Ford dealer tools) display this code with a failure-type suffix, such as P114B-00 or P114B:00; the base code P114B is the same.

## What do Bank and Sensor mean?

Bank 1 is the side containing cylinder 1. Bank 2 is the other side on V or flat engines; inline engines have only Bank 1. Cylinder numbering depends on the engine, so check the manufacturer’s layout.

For exhaust oxygen sensors, Sensor 1 is upstream, closest to the engine; Sensor 2 is downstream, after the catalyst. Confirm the exact sensor layout in the vehicle’s service information.

Generic OBD2

## Generic OBD2: P114B

enPost Catalyst Fuel Trim Via Oxygen Sensor System Too Lean Bank 1

Reference namespace: obd2

Source revision: legacy-2.2.20

Generic OBD2 definition; confirm the protocol and vehicle-specific service information.

## What should I check before using this definition?

Keep the full code, module, status and freeze-frame data. Confirm the vehicle’s make, model, year and current manufacturer service information before choosing a repair. This entry does not identify a failed part by itself.

[Organize a scan report or recording](https://obdlens.com/analyze/)

Source and applicabilityOBD Lens production library legacy-owner-2026-11-02-v84-evidence. 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](https://obdlens.com/about/)

## What does P114B mean?

Post Catalyst Fuel Trim Via Oxygen Sensor System Too Lean Bank 1. 1 reference families define this identifier: Generic OBD2.

## Is P114B a generic or manufacturer-specific code?

Check the reference scope shown above for this identifier.

## Can P114B tell me which part has failed?

This entry does not identify a failed part by itself. Confirm the vehicle’s make, model, year and current manufacturer service information before choosing a repair.

## Continue with your vehicle

Use a specific profile to explore its enhanced signals and assigned code-reference families.

[Find a vehicle profile](https://obdlens.com/vehicles/)

## Read data from your car

Basic diagnostics and supported enhanced PID access remain free.

[Explore OBD Lens App](https://obdlens.com/app/)

OBD Lens reference library · catalog legacy-owner-2026-11-02-v84-evidence. [Sources and scope](https://obdlens.com/about/)

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Reference-family membership is not proof that a code applies to every listed ECU or vehicle. Runtime-ready definitions are not physical-vehicle validation. Unavailable readings must not be treated as zero. App and hardware sale availability must be checked separately.