Finally go the lamda sensor problem sorted there is an harneess plug with a 10mm bolt going through it and the feed wire to the lambda was traped but vehicle still flagging a running lean fault but emmisions all ok done another smoke test and the cam cover gasket is leaking on the bank with the breather to the throtle body which just happens to be bank 2 have decided to order gasket as it is only£6 from jaguar and coil seals which are £12 not sure if this will cure my problem as never had a cam cover gasket cause a lean mixture before has anyone else.

Many thanks
Carl