Update; removed MAF today and cleaned ,reset ECU and cleared codes, took the car for a good spirited run and went to garage and tested emissions - still high 0.789 .Put car on ramp and had a look for Lambda sensor - haven't got one fitted instead i've got an Innovate broadband sensor connected to the headers.Need to get to the bottom of this problem ,anyone any ideas????
IDEAS;
1.Remove Innovate sensor and fit Lambda- need to check if sensor is wired into ECU or just linked to Gauge on pillar pod ??
2.Fti a Z4 ECU and normal Lambda sensor ??