W221 Lean Mixture at idle

W221 S300 Yr 2008 giving check engine light at idle - lean mixture at idle bank 1 or 2 sometimes both. Not happens all the times but if its does when driving and brake after few second it will appears - during parking, traffic. i hv changed MAF, one O2 sensor (right hand side before cat converter). Launch scan code is failure on fuel adaptation. thanks for your help