no limp mode on a failed camshaft sensor unlike the crank sensor.that was a expensive mistake.however vectra po335 does throw the same code for either sensor,.the none starting should of given you a clue.when the crank sensor fails you can still drive the vehicle but it aborts to limp mode ,nothing more than 4000 rpm.oh and be warned the 2.5 v6 is well known for eating sensors and they don't come cheap.try and go for genuine vhx they seem to last a little longer.
pas autos
November 2011