Yellow warning light.

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New Member
Jun 4, 2015
Mercedes E Class Kompressor w211
Am currently driving E class 200 kompressor w211 but have experienced difficulty in last 3 weeks with the yellow warning light.Diagnostic read too problem with mix code p0171 therefore problem with oxygen lambda sensor which I replaced and also replaced air filter and 4 new spark plugs.Car was still guzzling fuel and light on.Then second diagnostic read engine misfire 0401 /0404 with coil packs 1 and 4 also replaced and 0171 back on again despite new sensor.Light has come back on still reading 0171 Any thoughts on this?? Many thanks
Apologies it should have read p0301/ p0304 engine misfire detected.Coil packs replaced yellow light still showing and still reading P0171 System too Lean (Bank 1)" very frustrating..

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