Problem of starting, crankshaft sensor, automatic gearbox

I have an issue for the last 3 years to start my automatic clio 2 phase 1. When I turn the key, it does not start when I am in Parking position or Neutral.
After viewing several topics I am pretty sure that it is the crankshaft sensor because when I turn the key for ignition , I put the gear in Drive or 2 and push the car to turn the wheel by an half turn, then the next try to turn the key starts the engine.

I have the work shop manual to replace it with the blue connector but unfortunately this book talk only about manual gearbox and not automatic.
I spent hours looking in the web but I can not find any tutorial explaining how to have access to the sensor. I would like to avoid to remove the part connected to radiator hoses if it not needed as I am not sure if the cable tray hide the sensor.
You 'll find attached pictures from the top view and side.

Thank you for your help and advice.

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Problem of starting, crankshaft sensor, automatic gearbox