Ford Transit Custom Lambda Sensor Oxygen Lambda Probe 2.0 Diesel JK21-5L248-AG

Ford Transit Custom Lambda Sensor Oxygen Lambda Probe 2.0 Diesel is an original component from the Lambda sensors and O2 sensors group, designed for diesel systems. It enables precise measurement of exhaust gas composition, supporting stable engine operation, correct fuel metering, and emission control in modern Ford units.

Specifications and technical data

• SKU: JK21-5L248-AF
• Mark: Ford
• Condition: Used
• OEM Part Number: JK21-5L248-AF
• Substitutable numbers: JK21-5L248-AF, JK215L248AF, 2382101, JK21-5L248-AG, JK215L248AG
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The lambda sensor in a diesel engine is responsible for continuous monitoring of the air-fuel mixture composition by analyzing the oxygen content in the exhaust gases. Based on its signal, the engine control unit corrects the fuel dose, which translates into:

• stable operation of the power unit across the full load range,
• more uniform combustion in city and highway driving modes,
• maintaining the efficiency of the exhaust gas treatment system (including components working with the diesel particulate filter),
• reduction of smoke and unwanted idle fluctuations.

A properly functioning lambda sensor is crucial for maintaining the factory parameters of a diesel engine and compliance with emission standards.

Advantages of using an original Ford component

The offered Ford Transit Custom Lambda Sensor Oxygen Lambda Probe 2.0 Diesel comes from the manufacturer's line of original components, which means maintaining factory signal characteristics and full compatibility with the engine control unit software. In practice, this provides:

• correct data interpretation by the ECU without the need for parameter adaptation,
• consistency with the factory fuel metering and exhaust gas recirculation strategy,
• reduced risk of diagnostic errors related to sensor characteristic mismatch.

As a result, the powertrain maintains predictable behavior, and computer diagnostics remain clear and repeatable.

Technical characteristics and compatibility

The component has been designed for use with diesel engines (fuel type: Diesel) used in the Ford Transit Custom. The sensor operates in the demanding thermal environment of the exhaust system, which is why its construction is intended for long-term operation under variable loads and temperatures. The product has an assigned OEM part number and associated replacement numbers, which facilitates selection via catalog or VIN.

Before purchasing, it is worth verifying compatibility with the specific engine version and vehicle model year using the manufacturer's catalog or seller support to ensure full compatibility with the wiring harness and controller.

Condition, diagnostics, and practical application

The offered lambda sensor is a used component, which allows for economical repair of the exhaust system while maintaining original specifications. This solution is particularly beneficial when resolving faults such as:

• stored errors regarding mixture composition or oxygen sensor operation,
• increased fuel consumption resulting from an incorrect sensor signal,
• problems with passing exhaust emission tests.

In many cases, replacing the lambda sensor restores proper engine operation without the need to interfere with other components, which reduces vehicle downtime and simplifies the service process.

Technical support and additional information

When selecting used electronic components and sensors, it is worth considering not only the car model designation but also catalog numbers and hardware compatibility. Detailed tips on selection, installation, and diagnostics can be found in the Global Parts guide: Used automotive electronics – ECU modules and second-hand sensors.

If you are planning a comprehensive repair or upgrade of the exhaust system area in your Ford and need other components from the same group, such as additional sensors, exhaust gas temperature sensors, or downstream oxygen sensors, check the available parts in the Ford Lambda sensors and O2 sensors category.