Ricochet

It's a bmw scan tool with live data I did wonder if there was a vacuum leak somewhere it does have a small oil leak nothing major so will check inlet manifold and hoses suppose I was hoping it was sensor thanks for advice Dave

Hi I have a 2004 x3 3.0 l petrol I have engine light on and diagnostic says running lean bank 1 and bank 2 I have replaced all o2 sensors and then reset fault codes light goes out for about 70 miles then same fault ones back any ideas on what's wrong many thanks Ray