Can anyone help? I have recently fitted a new battery on my 06 Signum 3.0 cdti. After i had fitted the battery the steering wheel light came on, i have learnt that this is a steering angle sensor fault. However i also have a problem that seems like the EGR valve. Sometimes it runs fine, sometimes it doesn't... i.e a big surge of power at about 2000rpm and also fuel consumption drops through the floor. I have taken the EGR valve off and it seems to shoot in and out as normal. Could the problem be being caused by another sensor not working properly? ....... Please help..