Hi, car came in for occassional cutting out fault but have noticed the idle speed can be as low as 475rpm it doesn't surge but can go upto 600rpm next time you pull up. The car drives fine.
2 codes logged
P0136 O2 sensor circuit malfunction B1S2
P0156 " " " " B2S2

I realise that these should not affect the idle and will check them out in due course.
STFT good, all data except idle looks good.
Have cleaned throttle body but not really dirty.

Any pointers here would be much appreciated.

Thanks, Martin.