2001 car - my alarm keeps going of , ive worked out its the sensors in the car thats doing it - if i plup the alarm a 2nd time when locking to turn them off i get no problems , any advice to what the issue may be ?

 

Check the number of flashes on the led. Mine used to do 3 flashes pause repeat, meaning bonnet sensor triggered, but there was nowt wrong with the sensor.

Your board will have given up, as they ALL do!