Hello I have A6 C6 2TDi 2005 BLB. On my vcds measure readings lambda show 0 and not moving at all. But don't show any mistake regards lambda or similar. Is this is normal? And takes 9l / 100km as earlier I believe it took 8l / 100km. I don't know to much about diesel cars. Or can same body compare it with them own car. Thanks for any info.