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How to Replace the Lambda Sensor on a Citroen C3

Model: Citroen C3 SC - Years 2009-2016
Part: Oxygen sensor

The purpose of the lambda sensor is to detect the concentration of oxygen in the exhaust gases to maintain the mixture ratio within the optimal efficiency range of the vehicle's catalyst. This video shows how to replace the lambda sensors on a Citroen C3, where there are two: one lower and one upper, typically replaced between 50,000 and 62,000 miles. Universal types from Bosch with code B0068N1CQO can be found online for £51.90 each, with free delivery for Prime customers. With the bonnet open, disconnect the red connector. To remove the upper sensor, a special key is required, as shown in the video, but it comes off easily. Insert the new one in the same way and reconnect the plug. To access the lower sensor, go underneath the vehicle, disconnecting a plug from above, but the procedure is identical, as shown in the video. Reconnect the plug here as well. Job done.

Updated on 4 September 2026 by ScegliAuto

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