Key features of the Lambda Sensor 1.0i include:

• Number of poles: 4
• Total length: 318 mm

Regular replacement of the Lambda sensor is crucial as it can wear out over time due to exposure to high temperatures and corrosive exhaust gases. A failing Lambda sensor can lead to decreased fuel efficiency, increased emissions, and potential engine performance issues.

Technical Information

• Manufacturer: PSA
• Model: Citroën C1, Peugeot 107
• Product Codes: 1618K9
• Additional Numbers: N/A

This specific Lambda Sensor is compatible with numerous models, including the Citroën Berlingo, C2, C3, C4, C5, C6, C8, SAXO, JUMPER, EVASION, JUMPY, XSARA and Peugeot 1007, 106, 206, 207, 306, 307, 308, 406, 607, 807, and Partner.

With a length of 410 mm and equipped with 4 wires, this sensor is designed for durability and optimal performance. Regular replacement is recommended as the Lambda Sensor can deteriorate over time due to exposure to high temperatures and harmful exhaust gases. A malfunctioning sensor can lead to increased fuel consumption and higher emissions, making it essential to replace it promptly.

Technical Information

• Manufacturer: PSA Citroën Peugeot
• Model: Various Models
• Product Codes: 161848, 1618Z7, 1628CW, 1628HR
• Additional Numbers: 161848, 1618Z7, 1628CW, 1628HR

High-quality replacement Lambda Sensor (Oxygen Sensor) designed for 1.0i Citroën C1 and Peugeot 107 applications. This upstream (pre-catalyst) sensor with a 4‑pin connector restores accurate exhaust oxygen measurement for proper engine fueling and emissions control. Ideal for professional workshops and experienced DIY mechanics who need a reliable OE-fit part (1618Q5) to clear rich/lean running symptoms, improve fuel economy and reduce emissions.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C1 (1.0i), Peugeot 107 (1.0i)
• Product Codes: 1618Q5
• Other Numbers: —

Function

The Lambda (Oxygen) Sensor monitors the oxygen content in the exhaust gases upstream of the catalytic converter and sends a voltage signal to the engine control unit (ECU). The ECU uses this signal to adjust air–fuel ratio for efficient combustion. A 4‑pin sensor indicates an integrated heater circuit plus signal/ground connections, allowing the sensor to reach operating temperature quickly and deliver accurate readings shortly after engine start.

How Replacement Is Performed

Replacement is straightforward for a trained technician or competent DIY mechanic with the right tools:

• Work on a cooled exhaust system and safely raise the vehicle to access the exhaust manifold/downpipe area.
• Disconnect the sensor electrical connector and inspect wiring for damage or corrosion.
• Remove the old sensor using an oxygen sensor socket or appropriate wrench. Apply penetrating lubricant if the sensor is seized, allowing time to soak.
• Compare the new sensor to the old unit to confirm connector and thread compatibility.
• If the new sensor is not pre-coated, apply a small amount of anti‑seize to the threads (avoid getting anti‑seize on the sensor tip or heater terminals).
• Install and tighten the sensor to the manufacturer’s specified torque, reconnect the electrical connector and lower the vehicle.
• Clear any stored fault codes and perform a test drive to allow the ECU to adapt to the new sensor signal.

Installation Recommendations

• Always work with the engine cold to avoid burns. Use proper jack stands or a lift—never rely on a jack alone.
• Use an oxygen sensor socket or appropriate tool to prevent damage to the sensor hex and wiring.
• Inspect and secure the wiring harness and connector to prevent chafing or contact with hot components.
• Avoid excessive force when disconnecting or connecting the electrical plug; check pins for corrosion and secure fit.
• If fault codes persist after replacement, review wiring and grounds; perform a live data check to confirm the sensor switches correctly between rich and lean conditions.

Why This Part Most Commonly Fails

• Contamination From Oil, Coolant Or Fuel: Oil or coolant leaks and unburnt fuel can coat the sensing element and degrade its response.
• Thermal And Mechanical Stress: Repeated heating/cooling cycles and vibration shorten sensor life or crack the sensing element.
• Wiring And Connector Damage: Corrosion, broken wires or poor connections result in faulty signals or intermittent operation.
• Exhaust Leaks Or Engine Problems: Exhaust leaks upstream of the sensor or issues causing abnormal combustion can lead to premature failure.

Opting for a correct-fit Lambda Sensor 1618Q5 ensures proper integration with the engine management system and helps restore drivability, reduce emissions and maintain fuel efficiency on Citroën C1 and Peugeot 107 1.0i models.

As a key part of the vehicle’s emission control system, the Lambda Sensor monitors the air-fuel mixture to ensure efficient combustion and reduced emissions. Over time, Lambda Sensors can fail due to prolonged exposure to high temperatures and contaminants resulting in poor fuel economy or increased emissions. Therefore, it’s recommended to check and replace the sensor during scheduled maintenance or if you experience any performance issues.

Replacing the Lambda Sensor is a straightforward process that typically involves disconnecting the old unit, unscrewing it from its position, and screwing in the new sensor. Make sure to check for proper fitment and connections to avoid any complications.

Technical Information

• Manufacturer: PSA Citroën Peugeot
• Model: Various (see compatibility)
• Product Codes: 1618AN, 1628HN, 1628KY, 1628NY
• Additional Numbers: Refer to specified models for confirmation

With a mileage of 48,000 km, this Lambda Sensor is designed for long-term reliability. The total length of the sensor is 410 mm, and it features 4 poles. Regularly checking and replacing the Lambda Sensor can prevent issues such as poor fuel economy, increased emissions, and engine misfires, which often occur due to wear and tear over time.

When replacing the Lambda Sensor, it is important to ensure that the engine is cooled down to avoid burns. The sensor is typically located in the exhaust system, either before or after the catalytic converter, and can be removed using appropriate tools. Regular maintenance ensures that your vehicle runs efficiently while meeting environmental standards.

Technical Information

• Manufacturer: PSA Citroën Peugeot
• Model: Various
• Product Codes: 1618Z7, 161847, 1628CW, 1628HR
• Other Numbers: 161847, 1628CW, 1628HR

This part is designed to monitor the oxygen levels in the exhaust gases, helping to optimize fuel efficiency and reduce emissions. Regular replacement of the lambda sensor is recommended as it can wear out over time, usually resulting in poor engine performance and increased fuel consumption.

Replacing the Lambda Sensor 1618AN is a straightforward process. It typically involves disconnecting the battery, removing the old sensor, and installing the new one in its place. Ensure the connector is securely attached and that no exhaust leaks are present.

Technical Information

• Manufacturer: PSA
• Model: Citroën, Peugeot
• Product Codes: 1618AN, 1628HN, 1628KY, 1628NY
• Other Numbers: N/A