Hi. I've just changed my engine yesterday and once started back up its in what I assume is limp mode (won't Rev over 3k) it's come back as a camshaft sensor but after swapping them both its still a reoccurring problem. Any ideas im really stuck on it

 

Check the harness connectors at each sensor. I've been seeing a lot of frayed/damaged ones and even ones where one terminal is partially pulled out of the connector. I'm fairly certain this is your issue if you've already replaced both sensors.

Good luck.

 

A split wire is what it was indeed, Thankyou for your help. Now have a 23 fault code... Knock sensor I believ. The fun continues lol