P0340 - Camshaft Position Sensor Circuit malfunction. Car is 04 LS 1.8 petrol (Z18XE) with 128,000 miles.

I have this fault set (read by scanner tool and pedal / blink), and the car with the spanner through it, but no MIL.

Engine revs limited to 4000 rpm, power and fuel economy down and response poor - especially at part loads.

I have changed the camshaft position sensor, with no effect. Also I have checked continuity of the 3 wires from the sensor plug to the engine control module - all good. Maybe one thing that is worthy of note is that there is a slight exhaust leak - but I haven't determined specifically where from yet.

Does anyone have a fault diagnosis tree or similar or even a list of specific faults that can set this FC? - Maybe someone who works in a VX dealer?


Cheers