Emissions light

[shuggler]

Had Emissions light on car few weeks ago,plugged into computer at garage which showed 1st lamba sensor.Replaced that cleared code and ok for couple of week until light on again.
Back on computer at garage showing faulty rear lamba sensor now and faulty air flow meter,both parts replaced and faults cleared.
Only drove it for one day and emissions light back on,but car doesnt seem to be any different driving wise,any ideas?

[lee gsi]

When you say its a the lambda sensor what were the faults as it maybe the sensor going out of range due to something else (Like an air leak or faulty injector)

[shuggler]

Car seemed to drive normally but maybe fuel consumption maybe down a bit but other than that just emission light on constantly