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Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
What engine, and what codes are set please?
Has the valve been checked?
Ive never replaced a knock sensor in a Vectra.
Hello again Chris,
I meant to say above, has the valve timing been checked?
The V6 engine is a very fussy engine, and special tools are needed to do a timing belt.
The engine is prone to engine noise which might log codes for the knock sensor.
Can you tell me the code you get now?
That's ok Chris.
Come back when you have some more info.
Have a good day.