The thrust bearing has gone on my 206 gti 180, i was told there is a sensor on the flywheel that stops the car from starting and when you replace the clutch the problem is no longer there? Is this rig

flywheel teeth get damaged in 3 places for 6 cyl or 4 for v8 If the teeth are damaged then the fix is a replacement ring gear
now if the car is automatic it will not have a flywheel as the torque convertor does that job
there is a flex plate bolted instead to the crank shaft and inturn bolted to the torque converter
They are kown to develope faults and crack off at the crank shaft so that they become warped ( not allowing full pinion engagement) or dreak off altogether and not turn the crank at all
The thrust bearings on the crank generally do not fail as they run in oil all the time so disregard that suggestion( if the thrust bearing was to fall ot completely , the added movement is 1/8 " and the pinion would still engage a good ring gear)
Now the teeth have to be replaced so for an automatic it is a new flex plate ( box out )
for a manual it is flywheel off and a new ring gear fitted to the flywheel ( box out )
check the pitch of the teeth of the new starter
the movement of the pinion can be checked by an accredited auto electrician and adjusted by the encentric pivot pin in the solenoid fork
So what ever happens the box has to come out for the repair

Don't think its the flywheel, but maybe a worn out thrust bearing. I suggest you replace your clutch plate and have the pressure plate checked at the same time you replace the thrust bearing.

thrust bearings are bad and the flywheel is moving out of range of the crankshaft sensor, or the crankshaft sensor is sitting too close to the flywheel.

You should take it back to where the clutch was done. They should have check the thrust bearing, flywheel and everything else associated with the clutch when they replaced it.

this sounds like the throwout breaing is going or gone bad and may have lost it purpose of controling the pressure plate, by not being able to select a gear tells me something has gone bad in the clutch system like the bearing which pushes the pressure plate to release the cluch which allow ****** to stop spinning so that the gear can be selected. the repair for this would be to replace the clutch kit. the clutch pack will come with new bearing clutch disc and pressure plate and if needed a polit bushing, the whining noise was a warning that something in the cluch system was going bad.

This sounds more like a DMF problem (dual mass flywheel) If the car has more than 80K on it.. or the clutch was replaced but the flywheel was not.. you probably have one or more weakened springs in the DMF.

The throw out/thrust bearing is located between the pressure plate and and the transmission itself.

Best of luck

Check the drop link and sway bar (anti roll bar) bushes also the knock could be in the strut top or the strut itself, maybe disconnect the drop link to the sway bar and drive over a pothole and see if the knock is still there.

i have been fixing peugeots for 12 years and never heard anything like that.
it is mrer then likley a faulty crank position sensor, coil pack or quite simply the fuel cut off switch needs resetting which should be located under the bonnet on the n/s (black unit with a red rubber top) just press the top and try starting the car..

if this helps let me know
cheers
big mike

undo centre wheel hub nut 30mm/32mm, socket. undo lower wish-bone outer bolts, disconect battery,/remove starter motor,/remove transmission mounting bolts to body frame ,/ remove all surrounding bolts around bell housing transmission,/ remove clutch cable from transmission,/ remove drive shafts from centre hub and transmission,/ make sure car is standing on axle stands at front of jacking points,/use a trolley jack to suport engine sump with a piece of wood,/ slide transmission away from flywheel,/lower transmision on floor,/undo all clutch plate preasure bolts 10mm,/remove thrust bearing located on centre transmision shaft ,.also make sure if fitted speedo cable needs to be removed.new clutch plate should indicate flywheel ,without fitting clutch plate wrong way round/otherwise transmision will not bolt to engine block.,

Check the alternator belt for proper tension. Also check alternator voltage output. If output is low the rest of the systems can fail.