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
A Renault Scenic can start without a TDC (top dead center) sensor, but it may experience issues such as rough idling, misfiring, or difficulty in starting. The TDC sensor is crucial for the engine management system as it helps determine the position of the crankshaft. If the sensor is faulty or missing, the engine may run poorly or not at all, depending on the specific engine management setup. It's advisable to replace or repair the sensor for optimal engine performance.
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
To replace the TDC (Top Dead Center) sensor on a Renault Megane, first disconnect the battery to ensure safety. Locate the TDC sensor, typically found near the crankshaft pulley or on the engine block. Remove any necessary components for access, then disconnect the electrical connector and unscrew the sensor. Install the new sensor by reversing the steps, ensuring it's properly secured, and reconnect the battery.
at the back
To change the TDC (Top Dead Center) sensor on a 2005 Grand Scenic, first, disconnect the battery to ensure safety. Locate the TDC sensor, which is usually found near the crankshaft or flywheel. Remove the electrical connector and unscrew the sensor from its mounting point. Install the new sensor by reversing the process—secure it in place, reconnect the electrical connector, and reconnect the battery.
Improve capacity
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.