I’ve read loads of things about this and it’s causing me pain.

2005 focus st keeps playing daft buggers. Sometimes the immobiliser won’t go off so I have to keep turning the ignition off, other times I get the engine warning, acceleration reduced lights. I also seem to have 2 different limp modes. I’ve had a fault reader on it and the only thing that came up was the lambs sensor fault to which I’ve ordered a new one.

i had a new battery on back in April and have heard that I need a silver calcium battery. The battery I’ve got is silver technology so I don’t even know if it’s the right one.

https://www.eurocarparts.com/ecp/c/F...f742cd6&000020

I’m saving for a wedding at the minute so don’t want to be going to an auto electrician to tell me he can’t define the fault along with a huge bill.

please help.