code problems P0670 and P0340

[ALMURRAY]

hey folks,

Got a 55 1.5 diesel megane estate and needing some help..

Fault code readers bringing up the following:

P0340 - camshaft position sensor A circuit bank 1 or single sensor

and

P0670 - glow plug control module control circuit open..

I have noticed on higher revs I get an injector fault warning on the dash and thought I may have an injector out, now Im not so sure

Can anyone solve or shed any light on this and a possible solution?

other thing is Im using clutch/brake fluid.. occasionally the clutch pedal will go drown and not come up as easy without some persuasion, gears can be hard to select if its got a little too low.. brakes dont seem to be affected at all so Im thinking its possibly the clutch slave cylinder as I cant find any leaks from the master..

Any help appreciated as I dont have a renault dealer near me..

Alan