Similar issue on my 1.2 3 cylinder 54 plate Fabia
The engine management light started to come on with no obvious performance issues and using a reader the code was 16725.Cam sensor.
I cleared it and it ran as before but the light and fault code would pop up again from time to time.
The cam chain then started to sound noisy and it transpired the plastic chain guide had broken.
So...new cam chain and sprockets fitted using cam locking tools and crank tool ..all timed up correct so fired up.
Ran ok for a short while then misfired.
Renewed all three coil packs and plugs as well as cam sensor and again it ran well at times but 16725 pops up again with the warning light.
Strange thing is however it goes into limp mode intermittantly sometimes when the fault appears and even if the warning light isnt on !
Question...could the crank sensor, or any other sensor ( one that fits near flywheel at rear of block) have any influence or any other issue ?
Running out of ideas folks...any clues on voltages to check etc.
And finally ...sorry to go on a brief issue with fault code 17759 showing up but it appeared only once, was cleared and hasn't come back.
