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Camshaft position sensor on Ph1 TS

753 6
Now that my diagnostic kit is all working and the new rad is fitted I gave the engine a run to see what was putting my EML on.
Turns out it's indicating the cam sensor so I wondered if this is a common failure on the Ph1 TS?
Also can it be changed without taking all belts off or can it be done from behind?
Belts are being changed anyway but I thought I'd ask.