here is pictures and advice on how to replace it :) http://www.renaultforums.co.uk/showthread.php?t=10062
The coolant temperature sensor in a Renault Megane Scenic is located on the right hand side of the engine as you are looking at it. It is located just above the TDC sensor.
where is the tdc sensor on a 2003 scenic 1.6
Tdc sensor is located lower front of gearbox on Renault laguna diesel engine 2001 onward.
renault magene coupe..2ltr sensor 8200156362
You have to remove the battery to take it out and see it better, one the battery is out you will see two small bolts that hold the sensor in pace over the crankshaft. Peter
at the back
In K9K engine series: If you mean the tdc in order to lock crankshaft to replace timing belt, in front of the engine near the flywheel zone right below the oil pressure valve there is a small bolt (usually with a torx head "star"). Removing that bolt and inserting a special locking tool through that hole ,will lock crankshaft right on the tdc. No he means the TDC Sensor which is on top of the bell housing it is held in place on a banana shaped plate which is bolted to the engine with 2 10mm bolts.
what are the symptoms of bad tdc o2 sensor
Had same problem on mine, took the TDC (Top Dead Centre) sensor off, cleaned it and has been fine since. there are some good photos on how to do this if you google it. Good luck Rich
It sends information to your ECM computer to inform cylinder one when to spark and to get the fuel mixture correct.