which o2 sensor could effect emmissions?
I have a 2001 xsara Picasso 1.8 petrol and it has fluctuating co2 emmissions what I want to know is which o2 sensor to change as there is a up and down stream sensor the lambda and hydrocarbons are fine and the o2 is better at idle but not right so if anyone can suggest any solutions I would be very grateful
Dave, June 2012
