Fuel System Running Rich banks1 and 2 W209

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PLK280

New Member
Joined
May 11, 2020
Messages
8
Location
London
Car
Mercedes-Benz CLK 280
Hello,
Ive had trouble diagnosing this issue, and I’m wondering if i may have a faulty sensor, but which one?
When I look on my cheap OBD scanner and test various sensors, all pass apart from ‘Fuel system bank1’ and ‘Fuel System bank2’. The trouble is I don’t know which sensors the reader is referring to. Can anyone help?

BTW: o2 sensors etc. All fine, no vacuum leaks, new MAF, fuel trims are ok but slight difference between the banks.
 

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