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[Jimbob]

It amazes me that a Vauxhall dealer didnt know this.

Doesnt amaze me   

Oh....and when you replace that sensor, dont try and saeve a few quid with a pattern / aftermarket one. Get Genuine from Vauxhall. 

[Gaffers]

I reckon that when the crank sensor on the V6 is on it's way out you get similar symptoms.

Once I change mine after Easter I should be able to confirm this.

[jimac]

Before you go buying a new cam sensor, just try unplugging it and cleaning the contacts with a bit of contact cleaning spray.  You have the same symptoms and codes I had and simply disconnecting the cam sensor and reconnecting it cleared the problem.  I was getting a P0340 every other day or so but I haven't had one for nearly two weeks now.

[athers]

ok had cam sensor changed (plug was also broken  )

it hasnt faultered yet  but now that they put firmware version 10 on ecu and gearbox yesterday , the gearbox is "lumpy" as hell from cold , was so smooth before - except for the orignal fault . does anyone think this could be this new firmwares fault ??

[Jimbob]

some gearbox programs run in 'keep it in low gear mode' for a minute or 2 to heat the atf faster, could it be that you are experiencing?

the upgrade is normally a massive improvement.

The car may also take a day or 2 to learn new values depending on what else they have done.

[athers]

it might be that , as when i took it home from upgrade and engine was hot it was a different , in a good way , car