I couldn't find any particular information on your Renault, however there are typically 2 sensors located in the exhaust stream.
One pre-lambda and one post lambda. The pre is located in the exhaust stream close to the cylinder head and the post is located after the exhaust catalyst.
Regards,
The lambda sensor checks the car is running the correct air/fuel mixture, it is situated near the exhaust manifold, usually screwed into the catalyst.
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