thank you again,both sensors out.fae 777350 markings confimed,brands hatch told me the faulty sensor was driver side but to replace both...a bit of progress,still unsure about replacement its a minefield,i have a list of alternative sensors from oxygensensor website but when i enquire with the part no the various companies come back with it doesnt fit although some look identical,have left an e mail with mark adams at tornado and awaiting reply.might have a decent lead on the fae sensors but its a long shot...and a long wait.i am pretty cheesed off with it,but not as cheesed off as yesterday so a bit of progress....i still love the car.again thank you for your advice