Ford Fiesta Mk7 Focus Lambda Oxygen Sensor 1.6 Diesel TDCi AV2Q-9D375-AA

Ford Fiesta Mk7 Focus Lambda Oxygen Sensor 1.6 Diesel TDCi is a component from the Lambda sensors and O2 sensors group, designed for Ford diesel systems. It enables accurate measurement of exhaust gas composition in a diesel engine, which translates into stable engine operation and proper communication with the control electronics.

Specifications and technical data

• SKU: AV2Q-9D375-AA
• Mark: Ford
• Condition: Used
• OEM Part Number: AV2Q-9D375-AA
• Substitutable numbers: AV2Q-9D375-AA, AV2Q9D375AA, 0281004158, 9687160980
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The lambda sensor in a 1.6 TDCi engine is responsible for monitoring the mixture composition in the exhaust gases and sending a signal to the engine control unit. This allows for precise fuel dosing, maintaining proper operating parameters of the turbodiesel, and reducing emissions. In diesel units, a properly functioning O2 sensor is significant for the operation of the injection system, the diesel particulate filter, and regeneration strategies.

Compatibility with the diesel engine

The presented sensor is designed for systems powered by Diesel fuel, which means its measurement characteristics are adapted to the specific operation of TDCi diesel engines. Using the correct O2 sensor for a given fuel type minimizes the risk of control unit errors, uneven engine operation, and emission control problems.

Product characteristics and advantages of use

As a component from the Lambda sensors and O2 sensors group, this sensor is designed to work with factory Ford electronics, which helps maintain the consistency of engine operating parameters. Choosing an original dismantled part allows you to:

• maintain compatibility with factory engine control unit maps,
• preserve predictable engine response to load,
• reduce the risk of errors related to the fuel mixture and exhaust emissions. A used component of this type is a good choice for maintenance repairs when you want to maintain the original operating characteristics of the system while keeping service costs reasonable.

Condition and installation aspects

The product is offered in a used condition, meaning it comes from dismantling and was previously used in a vehicle. Before installation, a standard visual inspection of the wiring harness, thread, and connectors is recommended, as well as the use of appropriate anti-seize paste for threaded elements in the exhaust system. Proper tightening and correct routing of the signal cable reduce the risk of mechanical damage and signal interference.

Engine performance optimization and diagnostics

A functional lambda sensor in a 1.6 TDCi engine supports:

• stable idle speed and smooth acceleration,
• proper operation of the exhaust gas cleaning system,
• easier computer diagnostics – the control unit receives reliable measurement data. As a result, replacing a faulty O2 sensor with the correct component helps eliminate common symptoms such as increased fuel consumption, loss of power, or frequent emission-related warning lights. If you are planning a comprehensive repair or upgrade of the engine area in your Ford and need other components from the same group, such as additional O2 sensors, pre-catalytic converter sensors, or post-diesel particulate filter sensors, check the available parts in the Ford Lambda sensors and O2 sensors category. For a better understanding of when it is worth choosing a used original component with the manufacturer's logo and how to approach the safe replacement of dismantled parts, read the article Spider web on the windshield? Why it is better to choose a used original with the manufacturer's logo when replacing parts, which discusses a practical approach to selecting and installing used parts.