clk 320 (w208) codes m.a.f ?

[THE BEAR]

i have a 2002 clk 320 in the workshop today, no management light showing , but upon driving the car my initial impression was the mass air flow sensor, the car was backing off, lacking power, and felt like it was underfuelling,upon inspection, and speaking to the owner, a cheapie maf had recently been fitted , which was purchased on e bay !
my scanner highlighte four codes P2017 IDLE FUEL TRIM BANK 1, P2086 IDLE LOAD FUEL TRIM BANK 2, P20D4 LOAD LIMIT IS ACTIVE,P2004 HOT FILM MASS AIR FLOW SENSOR.
i have fitted a bosch unit and two of the codes no longer appear but i am still getting P2017, and P2086 .
any thoughts.
also worth noting, when monitoring live data , all four o2 sensors are functioning.
thanx, mark